Question about 2000 Pontiac Montana

20 Answers

Pontiac montana wont run right

2000 pontiac montana hesitated then stalled during operation. we let it sit for a couple of min then it would run. problem worsened until it would start but backfired and wouldnt stay running. i replaced the crank sensor, cam sensor, coil packs, air filter,ignition module,and tested fuel pressure(60 psi). i ohmed the wires from module to crank sensor(965). i also disconected the exhaust to check for blocked cat. inspected mass air flow sensor. i removed the spark plugs and they seemed to be loaded up with gas. i cleaned them (glass bead) then replaced. still no start. i gave it a shot of ether then it started but still had rough run with backfire. $500 in and still broken! help! please!

(one time during process it started and ran perfect. i shut it down then restarted and problem came back and never went away)

Posted by on

  • 13 more comments 
  • gregory799 Nov 25, 2008

    the van is fuel injected

  • gregory799 Nov 25, 2008

    it wont run even when cold would coolant cause it not to run on startup?

  • gregory799 Nov 25, 2008

    fuel pressure is good 60 psi

  • gregory799 Nov 25, 2008

    i removed the fuel filter and it was not blocked

  • gregory799 Nov 25, 2008

    thanks ill try it

  • gregory799 Nov 25, 2008

    not yet

  • gregory799 Nov 25, 2008

    thanks

  • gregory799 Nov 25, 2008

    paul
    I didn't check whether it held pressure with the gauge on and i did not test the fuel pressure regulator.

  • gregory799 Nov 25, 2008

    j

  • gregory799 Nov 25, 2008

    i will

  • gregory799 Nov 25, 2008

    l

  • gregory799 Nov 26, 2008

    checked tps sensor, ct sensor, iac, map, only codes are o2sensor and fuel level sensor circuit plugs are aridium
    hand vacuum pump on fuel pressure regulator
    i am going to get to the injectors after work today(they are tough to access) i put two containers of dry gas last nite to see if it could be moisture in the gas

  • gregory799 Nov 27, 2008

    the engine is the 3400

  • gregory799 Nov 29, 2008

    i have changed the fuel pump but havnt gotten to remove the plentum to get to the injectors

  • gregory799 Nov 29, 2008

    i will do compression test asap

×

20 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Champion:

    An expert who has answered 200 questions.

  • Expert
  • 298 Answers

Have you tried checking the fuel presser regulator on the fuel rail, sounds like it is stuck open.

Posted on Nov 29, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Champion:

    An expert who has answered 200 questions.

  • Expert
  • 251 Answers

1 Inspect Air Filter Restricted or clogged air filter. pontiac montana wont run right - grey_line.gif 2 Inspect Fuel Filter Clogged or dirty fuel filter grey_line.gif 3 Inspect Distributor Worn, loose or incorrectly adjusted distributor. pontiac montana wont run right - grey_line.gifttp://i.fixya.net/uploads/images/grey_line.gif" alt="grey_line.gif" class="h_mi" /> 4 Inspect Distributor Cap Lopontiac montana wont run right - grey_line.gifd distributor cap grey_line.gif 5 Inspect Distributor Cap And Rotor Kipontiac montana wont run right - grey_line.gifacked, or worn distributor cap and ignition rotor. greypontiac montana wont run right - grey_line.gifass= 6 Inspect Spark Plug Fouled, damaged or broken spark plug(s). 7 Inspect Wireset Damaged, worn, or deteriorating spark plug or coil wire(s). grey_line.gif 8 Inspect Throttle Position Sensor Faulty throttle position sensor or throttle position sensor circuit. pontiac montana wont run right - grey_line.gif"http://i.fixya.net/uploads/images/grey_line.gif" alt="grey_line.gif" class="h_mi" /> 9 Inspect Catalytic Converter Clogged, damaged, defective or faulty catalytic converter. grey_line.gif 10 Inspect Air Cleaner Temperature Sensor Damaged or faulty air pontiac montana wont run right - grey_line.gifrature sensor or air cleaner temperature sensor circuit. grey_line.gif 12 Inspect EGR Valve Clogged, dirty or improperly functioning or defective egr valve. grey_line.gif 14 Inspect Hose (Vacuum) Misrouted, damaged, loose,pontiac montana wont run right - grey_line.gifacuum hose(s) grey_line.gif 15 Inspect pontiac montana wont run right - grey_line.gif Sensor Improperly connected or faulty mass air flow sensor. 16 Inspect MAP Sensor Improperly connected or faulty m.a.p. sensor. grey_line.gif 17 Inspect Knock Sensor Improperly connected or faulty knock sensor. grey_line.gif 18 Inspect Ignition Timing Incorrectly adjusted engine timinpontiac montana wont run right - grey_line.gifrc="http://i.fixya.net/uploads/images/grey_line.gif" alt="grey_line.gif" class="h_mi" /> 19 Inspect Piston Ring Set Worn or broken piston rings. pontiac montana wont run right - grey_line.gifp://i.fixya.net/uploads/images/grey_line.gif" alt="grey_line.gif" class="h_mi" /> 20 Inspect Fuel System Pressure Incorrect fuel pressure being delivered to carburetor or fuel injection system. grey_line.gif 21 Inspect Fuel Pump Improperly functioning fuel pump or circuits. grey_line.gif 22 Inspect Fuel Injector Pressure Regulator Faulty fuel injector pressure regulator or circuit. grey_line.gif 23 Inspect Fuel Injector Plugged, dirty or poorly connected fuel injector. this should help u
Shaun

Posted on Nov 29, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Governor:

    An expert whose answer got voted for 20 times.

  • Expert
  • 98 Answers

Hi there,

I read your problem and have a couple of very feasable ideas to try.

First off, your transmission WILL NOT cause your car to stall or not start. Secondly, your coolant wouldn't be your problem either. The only thing that your coolant could cause is overheating once the vehicle is warmed up. I would suggest getting a tester to make sure that you're getting spark on all 6 plugs. If that doesn't fix things, try checking/replacing your fuel pump. Also, depending on where you checked your fuel pressure, it's possible that there is some type of blockage further up in the line, which may suggest that you have in injector that's not pulsing. There is a set of tools called "noid lights" that fit on top of the injectors' electrical connections and will flash in a pulsating manner if the injectors are firing properly. You might be able to rent these from your local parts store to keep from having to purchase a set. E-Bay is the best place to look if you're wanting to purchase a set.

If you still have no luck after checking these things, I would recommend having the vehicle towed to a repair shop as, chances are at this point, the problem lies deeper than that you think and the vehicle should have a proper diagnostic ran on it to pinpoint your problem. After the diagnostic, you can decide to take the vehicle and fix it yourself with the information they provide, or you may decide to go ahead and let them do the work. Either way, they will find the problem. After all, that's what they get paid to do. It bites having to take it to a mechanic, but sometimes even the best "at-home" mechanic cannot pinpoint/repair some things. Hope this helps and have a great afternoon!

James

Posted on Nov 29, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 146 Answers

The Transmission is shot aka. dead you need to buy a new one.. Even ask a mechanic they will say the same thing.

Posted on Nov 27, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,952 Answers

If you are currently experiencing a concern with your coolant system, we ask that you contact your local GMC and Pontiac dealerships. They are in the best position to diagnose the concerns you are experiencing with your vehicles. They can also advise you how often the DexCool should be changed in your area.

Posted on Nov 27, 2008

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 1,861 Answers

After reading the multitude of useless information, I have to say at this point that you are in dire need of some bonafide information;
I will be happy to assist you, all I need to know is what engine (3.1 or 3.8) is in the Montana. Please respond for a fix.

Posted on Nov 26, 2008

  • Toyota Ed Nov 29, 2008

    Please advise me of the results of your compression test, each cylinder and the specific PSI per cylinder. Thanks.

×

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 72 Answers

I would check the fuel pump and fuel lines as well as vacuum lines. your mixtures have to be off somewhere. you seem very knowledgeable as you have replaced most of the things that could be causing you trouble, also the ether was a good idea but i suggest draining/ replacing the fuel in your tank. Also going to a shop that runs a free diagnostic wouldn't hurt now that you have your sensors up and running. also for a do it yourselfer like you i would check out a chilton's manual for your vehicle ($20) to see what else you could do. let me know if this helps or if you have any other questions, im on at least once a day

Posted on Nov 25, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,450 Answers

ONCE THE plugs are gas fouled they are shot cleaning will not help the gas soaks into the porcelain and will never fire right again. Need to replace plugs although this is not your problem it is not helping. We can guess all day long what your problem is but really need to hook a scan tool up and see all the data and sensor perimeters.like what was mentioned the coolant sensor is an option that will cause this although the harness going bad is not as common on these newer models as earlier models of gm. The ether is more flammable than fuel this is why it fired on starting fluid. These are known for having coolant leaking into engine from intake are you losing coolant? if you have some leaking into the cylinders it will cause all this as well. until you see what the pcm is seeing there is no black and white answer to give you. The plugs do need to be replaced if you have fixed problem and have the fouled plugs they will not fire as should and can cause all this.

Posted on Nov 25, 2008

  • TripleTauto
    TripleTauto Dec 02, 2008

    just pulling the injectors and looking at them is not gonna tell you anything.have you checked fuel pressure? how are you checking the sensors? just because a sensor is not throwing a code does not mean all is well with that circuit.the amount of parts you have thrown at this vehicle trying to fix it is probably more than it would have cost to have repaired. even though plugs are iridium they can still get gas fouled

×

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Expert
  • 85 Answers

I read alot of the comments. but know one has said the coolant temp sensor. if it goes bad or the pigtail is bad. very common. the computer will default to lowest temp reading which is -30 f this will cause a very rich condition. replace the coolant temp sensor and the pigtail they usually come together. also replace the plugs again. at the same time just cheap plugs. until your problem is gone then your choice plugs. good luck

Posted on Nov 25, 2008

  • joe carroll Nov 25, 2008

    one more reason makes me thin.k this is your problem you said once you started it and it ran good. you may have bumped the ct sensor. while playing with other things. good luck. sounds like the pig tail. very common .

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 6,966 Answers

Hi and welcome to FixYa,

Offhand, based on your description:

  • hesitated - fuel starvation;
  • stalled - fuel deprivation;
  • sit/run - intermittent;
  • start, backfire, wouldn't stay running - either no fuel or no spark
  • shot of ether - alternate source of fuel.
It would appear that you have multiple different but interrelated problems but the clincher would be; it ran perfect one time. Based on this, may I offer a very remote possibility. Problem is electrical in nature. To be more specific, a common electrical failure of several of the electrical/electronics in the ignition system. The common would be the ground or grounding system. Pls check the ground points, wires, connectors, screws with particular attention to the ground wire/point of the computer module.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 25, 2008

  • Louie  Role
    Louie Role Nov 25, 2008

    Could you then check the consistency of the ignition B+12 to all points?

×

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Champion:

    An expert who has answered 200 questions.

  • Expert
  • 283 Answers

Hi,

Have you check your fuel hose and tank? Try to drain the fuel tank and clean it.Goodluck,hope this coul help.Please dont rate if could not fix your problem. Post for futher information. Thank you

Posted on Nov 25, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Guru:

    An expert who has written 7 tips or uploaded 3 video tips

  • Master
  • 674 Answers

Hello
from all the posts i have read i would like you to pull a couple of spark plugs to see if they are wet with fuel.
you can clean plugs but when they are fuel fouled you need to just replace them
but that doesnt cure the original problem
we need to find out why this engine is flooding .
you said you checked fuel pressure .
when you turn off the key does it hold pressure?
if its drops you might have a fuel injector leaking.
and with the fuel pressure guage on did you test the fuel pressure regulator?

please dont rate my answer untill we cure your problem because if you rate my answer you cannot read any more of my posts
thanks
paul

Posted on Nov 25, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Expert
  • 86 Answers

You concentrate on your engine plugs, they may have weak sparks that causes your engine to backfire, I didnt read anything about you changing it and and kindly double check on the wirings of your ignition packs, this may cause weak sparks

Posted on Nov 25, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 899 Answers

Have you tested the throttle position sensor?
also if it back fired then the timming may have jumped , can you tell if it is still lined up?

electech

Posted on Nov 25, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 659 Answers

How does the vehicle run with the mass air flow sensor disconnected? It might be telling the computer to run rich

Posted on Nov 25, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 276 Answers

You have some sort of a fuel delivery issue. either a restricted fuel filter or a fule pump that is pro producing enough pressure or volume to keep the car running. Has any service engine soon lamp come on?

Posted on Nov 25, 2008

  • Level 1:

    An expert who has achieved level 1.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Contributor
  • 728 Answers

Check your anti freeze and radiator to make sure they are cooling the engine correctly. This would cause the engine to sputter and stall. This could also cause the backfire and more damage to the engine. Then you can check the alternator because this can make it hard to start.

Posted on Nov 25, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 4,806 Answers

If the car is "backfiring" then the problem is in the engine, it sounds like it is missfiring, this could be a faulty spark plug or a damaged piston or piston ring, late ignition timing could cause this or an excessive amount of fuel in the exhaust system. also backfire can be caused by choke not shutting off completely, also could have a bad distributer cap, bad ignition condensor, bad plug leads, or to much fuel getting to carburation system.
It could be any one of these

good luck and regards

Posted on Nov 25, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,847 Answers

Get the fuel injector and the spark plug... that seem to cause the issue

Posted on Nov 25, 2008

  • Legin Varghese
    Legin Varghese Nov 25, 2008

    A backfire occurs when there is an imbalance in
    the air to fuel ratio required for your vehicle to operate properly. If the
    fuel mixture is too lean (not enough fuel) you may have a backfire in the intake, or too rich (too
    much fuel) you may get a backfire out of the exhaust system. Most backfires are easily repaired
    by correcting the imbalance and providing a greater or lesser percentage
    of fuel to the mixture.

    To prevent backfires there are several things you can do:

    Change
    the fuel filter
    as needed, the fuel filter is a vital part of your fuel system
    and can cause a backfire(s) if the filter is clogged and not changed regularly.
    A bad fuel filter can cause low fuel pressure creating a perfect situation for a
    backfire to occur. Changing the filter is simple and can save gas with improved
    performance of your vehicle's engine reducing the occurrence of backfires.

    Tune up and service
    your fuel injection system to follow the maintenance schedule for your particular
    car. This ensures correct fuel consumption with the correct amount of emissions.
    Fuel that is not burned completely will leave ample opportunity for a backfire to
    occur. These maintenance requirements are associated with other systems on your
    vehicle. Avoiding maintenance on your car can increase the risk of backfiring and
    other system malfunctions.

    Kevin



  • Legin Varghese
    Legin Varghese Nov 25, 2008

    Let me know if you need more assistance .... Kevin

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Pontiac Master
  • 61,249 Answers

Guessing is very expensive, take the car in and have a code test run and the fuel pump tested. If it started on s. fluid then fuel is an issue.

Posted on Nov 25, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2000 Pontiac Montana that starts and runs fine for 7-12 min then looses throttle power. Sputters at 1k-2k for 10-15 min then runs fine for 7-15 min then runs even worse, wills sputter at 750+ rpm.


3.4L Engine Sensor Location Pictures and Comments

www.greatautohelp.com/sensor-location/3400-Sensor-Comments-2.html
the battery for a few minutes to see if that helped. ... If the gauge is at half way on the first start, then yes, either the ... All of a sudden I could not accelerate and the carelost power. ... But once the temperature gauge goes to normal it will run fine. ... 3-7-12. I replaced head gaskets and intake gaskets on my 2000 Pontiac 3.4L

[PDF]2000 Pontiac Montana Owners Manual - GM Extended ...


Nov 28, 2015 | 2000 Pontiac Montana

1 Answer

It stalls oout like not getting fuel


change the fuel filter, sounds like its clogged up..

Jan 27, 2013 | 2002 Chevrolet Malibu

1 Answer

96 Astro van wont start after running


i had the exact same problem in a 2000 pontiac montana, change the spark plugs and wires, it worked PERFECTLY for me. it went from being completely unable to start when hot/warm, to starting up immediately. its probably misfiring when its warm as was mine.

Oct 26, 2012 | Chevrolet Astro Cars & Trucks

1 Answer

2000 pontiac montana reads a code 405, engine dies when i am slowing down coming to a stop and when sitting still if it dosent die it overheats,shifts really hard whats wrong


Sounds like EGR Valve (Exhuast Gas Recirculation Valve) is sticking in the open position allowing exhuast gas into the intake manifold to soon which at idle will cause the engine to either run real rough or to stall out.Some EGR valves can be taken off and clean the carbon out of it or you can replace it.

Apr 01, 2011 | Pontiac Montana Cars & Trucks

2 Answers

My 2002 Pontiac Montana has issues starting in hot weather. If it hasnt been driving for a while it starts and runs fine but the once you stop somewhere then theres a chance it wont start again. Actually...


check your temperature if it goes up quite fast you have a problem with your radiator or water pump, but if it is ok check your battery and alternator...

Aug 17, 2010 | 2002 Pontiac Montana

1 Answer

2000 Pontiac Montana LWB will not start when hot. Engine will crank, but will not fire or will fire but will stall out after 5 seconds. After a 10-15 min. cooling period, engine will start with no...


First with your incorrect fuel reading, you may need to have your fuel level sending unit replaced. Next if your vehicle otherwise runs fine when cold, no sputtering or hesitation if going uphill then I would suggest that your check your vehicle's air intake/induction system Mainly your air filter to see if it is clogged up which would impede air flow into your combustion chamber causing poor throttle response or suffication (not having enough oxygen for your fuel/air mixture to burn. Next I would have a thorough check performed on the emissions systems, also including your o2 sensor and possibly even your catalytic convertor and exhaust system. Start with that and let me know what your results are and I can advise you further if problems persist or worsen.

Aug 21, 2009 | 2000 Pontiac Montana

1 Answer

2002 Pontiac Sunfire hesitates when accelerating


there is a couple of things you can do ,, reset you computer take the hot wire off your battery for 5 min. then if that dont work check transmission fuild,, dirty trans fuild cause transmission not to down shift and stall

Aug 11, 2009 | Pontiac Sunfire Cars & Trucks

1 Answer

1997 plymouth voyager 3.0 fault codes 11 and 61


It sounds like the anti-theft control is malfunctioning

Jul 01, 2009 | 2000 Chrysler Grand Voyager

2 Answers

2000 grand cherokee stalls


try replacing the idle air control motor or IAC for short. i actually had one at work today with your same complaint. and sure enough the valve was a carboned up and wouldnt work properly. and its nearly impossible to clean to the point where it will work properly. cost for the part at a dealer is about $115.

Jan 15, 2009 | 1991 Jeep Cherokee Briarwood

3 Answers

Car stalled while running


Check under the back seat for an access panel to the pump. Might be the pump or just the level unit. Good luck.

Jan 08, 2009 | 2000 Pontiac Firebird

Not finding what you are looking for?
2000 Pontiac Montana Logo

Related Topics:

120 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

61249 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...