Question about 2000 Pontiac Montana

1 Answer

I have replaced fuel pump ,fuel filter, fuel pressure regulator , and cut casltyst convertor and replaced o2 sensor , i still have bad miss and wont take gas up hill sits and resitates and back fires any ideas

Posted by on

1 Answer

  • 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
  • 2,101 Answers

Did you check the vacuum that goes to the fuel pressure regulator. are the injectors working. sound like a vucuum problem or injector issue

Posted on Nov 08, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

66 chrgr
  • 1011 Answers

SOURCE: car wont start

check your fuel pressure it should be 35 psi .fuel pump relays dont go out but check all fuses with test light there is a fuel injector fuse but most likely problem is your fuel pump!

Posted on Mar 11, 2009

  • 1 Answer

SOURCE: Son's 99 Grand Am Gt

HEY!! I had same problem and i didnt know i solved it til i put in a brand new battery! I think the battery was getting old, and the extra amps told the 'computer' that the car wasnt running and it just died at start up sometimes. the new battery must have kept the computer from 'glitching off' when we started it. and all is great now!

Posted on Mar 17, 2009

  • 165 Answers

SOURCE: car starts but idles rough

this might be fuel injections clogged up try getting the injectors cleaned out and hope that works

Posted on Jul 06, 2009

rcates 82
  • 18 Answers

SOURCE: 1995 Bonneville Missing during acceleration

NEED NEW ECM

Posted on Jul 12, 2009

  • 44 Answers

SOURCE: low gas pressure in 96 sunfire.

You have mentioned that you replaced the O2 sensor. The oxygen sensor is completely ignored by the engine computer while the car is starting, and doesn't come into play at all until the engine warms up completely. Are you sure you have a fuel pressure problem? If so, replacing the O2 sensor would not have any affect.

To be sure you have a fuel pressure problem, you need to measure it. This car does not have a fuel pressure test port, so you need an inline fuel pressure test gauge. To test the pressure, connect an in-line gauge and switch your ignition switch to the "run" position. (Do not start the engine.) The fuel pump should run for two seconds. During this time when the engine is not running, you should have between 41 and 47 PSI of fuel pressure. If you start the engine, the fuel pressure should drop somewhat at idle (maybe somewhere closer to 28-35 PSI). Fuel pressure is regulated according to intake manifold vacuum, so at idle, it should be fairly low, while at higher throttle settings, it should be higher.

From what I gather, your car cranks for a long time before starting. If you suspect low fuel pressure, a defective fuel pump relay could cause that condition. The relay is located in a relay/fuse box under the hood on the driver's side of the car. If the relay fails, the fuel pump can still be energized by the engine oil pressure switch. This switch closes when engine oil pressure reaches ~4PSI. If your engine is not producing 4PSI of oil pressure while cranking, or if it takes a while to reach 4PSI, that would explain your problem.

Posted on Jul 28, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Mazda3,2005 trouble code p2177 system too lean off idle bank1


Check for correct fuel pressure.
If fuel pressure is low could be bad fuel filter, fuel regulator or pump.
If fuel pressure is correct could be bad MAF sensor, injectors, O2 sensor or vacuum leak on inlet manifold.

Apr 13, 2015 | 2005 Mazda MAZDA3

1 Answer

08 colorado hesitation


check your fuel pressure,if not right before you go buy new fuel pump,try new fuel filter
2- take the vacuum line to fuel pressure regulator .if it is wet with gas,the diaphragm is ruptured need new regulator
3- have exhaust shop check you cat convertor,also if you recently have head gasket problem,some of those anti freeze is burned by engine and ran through your cat convertor causes it partially plugged,
4- A bad throttle position sensor could be another cadidate
5- bad or old ignition coil could be also the reason,as it could not produce enough juice on higher R.P.M

Aug 27, 2014 | 2008 Chevrolet Colorado Crew

1 Answer

Will start but wont stay running


No the missing O2 sensors would not keep it from running. The missing exhaust pipes might not help matters. No exhaust system would cause a lack of back pressure.
I would want to know what base fuel pressure is with a gauge before and after cranking. Your thought about bad gas is legit, today's gasoline is only good for about 2 or 3 months before it starts gelling up.
Did you replace the inline filter the last time you put the new pump in ? And are you sure the pump is getting power after the key is released?

Feb 23, 2014 | Ford Windstar Cars & Trucks

1 Answer

I have a 92 Plymouth Laser with 12,000 miles. The fuel went bad while in storage. The tank was removed and cleaned and the fuel pump and filters were replaced. The car runs rich and surges and is worse...


Did you check fuel pressure after replacing the pump ?
If the regulator fails, it would either not maintain normal pressure, or leak fuel into the vac hose.
If the mass airflow meter fails, it won't run and the check engine light would be on.
Have you watched the O2 sensor and engine temp sensor on a scanner to see what they are reading ?

Sep 03, 2013 | 1992 Plymouth Laser

2 Answers

Code p0171 on 98 ford ranger


Well code 171 means the O2 sensor is telling the computer the fuel mixture is too lean and the computer can not make it go rich by increasing on time for the injectors.
The problem could be the O2 sensor, or low fuel pressure, or several other factors.

Feb 21, 2013 | 1998 Ford Ranger SuperCab

1 Answer

Engine light came on. checked for codes, 1129 appeared. can't find the code anywhere. prior to this code, replaced O2 sensor and transmisson was rebuilt . trans was done first and then code 300 came up....



Jeep code 1129:



Possible Causes

  • RESTRICTED FUEL SUPPLY LINE
  • FUEL PUMP INLET STRAINER PLUGGED
  • FUEL PUMP MODULE
  • O2 SIGNAL CIRCUIT
  • O2 RETURN CIRCUIT
  • O2 SENSOR HEATER OPERATION
  • O2 SENSOR
  • MAP SENSOR OPERATION
  • ECT SENSOR OPERATION
  • ENGINE MECHANICAL PROBLEM
  • FUEL FILTER/PRESSURE REGULATOR (HIGH)
  • PCM

Mar 02, 2011 | Jeep Grand Cherokee Cars & Trucks

4 Answers

I have a v6 5-speed 4x4. truck will start and idle fine for about 2minutes and then die. it starts right back up. someone suggested the fuel pressure regulator is bad.


To me,it sounds more like a coolant sensor,or a idle air control valve.But unless further testing is done,it is hard to tell,check the fuel pressure,to see if it is good,at all times.Check to see if it is firing when it goes to shut off.If you are convenced it is in the fuel,try a additive called Lucas fuel treament,it is a good cleaner for injectors,and fuel pressure regulators,also,use the additive called,Heet,to dry any moister from the fuel.Water in the fuel will cause this also.

Feb 26, 2010 | 1992 Toyota Pickup

2 Answers

1996 s10 2.2 engine starts but idles rough and will not rev up.


Hi! You must be frustrated by now! your code is marking that the O2 sensor is bad in bank 1. Did you replace the O2 sensor that is located  before the catalytic converter?  The S10 has an O2 sensor specially made for that cat. its about 30$ That would explain for your blackened spark plugs; your pc on the car is asking for more fuel. GOOD LUCK!!

Apr 29, 2009 | 1987 Chevrolet Blazer

1 Answer

Accellerating


What fuse did they change? Are you sure it wasn't a relay or sensor they changed? You need to check the computer codes and test the fuel pressure. It wouldn't be a clogged catalytic converter if it happens only occasionally but could be a bad O2 sensor, fuel pump or filter, fuel pressure regulator, VSS (vehicle speed sensor), dirty throttle body or bad IAC motor, throttle position sensor, MAF sensor. See there's lots of things to check that's why you need to check the codes and fuel pressure first.

Apr 16, 2009 | 1992 Volkswagen Passat

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

99 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

75744 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8123 Answers

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

Answer questions

Manuals & User Guides

Loading...