Question about 2001 Pontiac Montana

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Ok I have replaced fuel pump, fuel filter, MAF Sensor, air filter, spark plugs and wires if I unplug MAF Sensor will start and run at a very low and rough idle for about a min or so if I plug MAF back in or give gas it dies. HELP me please!?!

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I was chasing ghosts awhile back too....Had the hardest time figuring why my engine was running roughly, even after replacing the plugs, wires, MAF....I began thinking it was the intake manifold gasket....then maybe it was the injectors......It turned out to be my ignition coils. 2 out of three were misfiring....I thought the spark control module may be causing the ignition coil problem because I didn't believe two coils could go bad at the same time....so I bought a new spark control module and 3 new ignition coils and switched them all out to solve the wicked bad misfire...then I noticed what felt like a cylinder completely dead...not firing at all when I was traveling at 45 + mph....searched and tried a few diagnostic tricks to check the manifold gasket...then I noticed a pile of grease on the car frame just below and all around on of my CV joints. What I thought was an ignition problem turned out to be a warbling CV joint. Replaced it and now....all is calm....

Do you possibly recall a recent incident where your ignition coils may have been exposed to moisture? I did ...I later recalled I had done some wet work around my coil packs a few weeks back...right near the time the trouble started.
I purchased a testing device that you install between the coil and plug wire, that will indicate whether or not the coil is supplying a constant steady spark with enough juice to properly ignite the plug and fuel/air mix in the cylinder . It was 10-12 bucks. It has a light in an enclosed transparent housing that indicates the health of the spark being sent from the coil by brightness and evenly timed blinks.
When I used it there was an obvious difference in the light intensity and timing of the blinks between good and bad coil fire.
depending where your ignition coils are located, the job is real simple to perform and the parts were around $140.00. in California. Good luck be safe and I hope I helped some.

Posted on Mar 07, 2015

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If the maf sensor was a boneyard one id tey another, otherwise if its new, check wires/and wire harness for a short or broken prong

Posted on May 01, 2013

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I am having the same issue with my 97 regal. I am thinking it might be the MAP sensor

Posted on Jan 08, 2013

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Bad MAF sensor.

Posted on Mar 27, 2011

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2 Answers

I have 2 codes p0300 and p0171


code p0300 refers to random/multiple misfires--misfire detected===causes--spark plug/sHT leads--injectors--ignition coil/s---low compression---wiring
code p0171 refers to system too lean, bvank 1===causes--intake/exhaust leak--AIR system--fuel pressure/pump---MAF/VAF sensors---injectors---HO2S sensor
The common thread is fuel so have a pressure test done on the fuel system to check for pump and / or faulty pressure regulator, then progress to injectors.

Mar 06, 2015 | 1997 Buick LeSabre

1 Answer

I put fuel pump ,crank sensor, fuel filter, tune up and I still do the same start and shut off


Does it have a SECURITY system in it ?
Is the SECURITY Light on or Flashing Sparatickly ?
Any Trouble codes ?
POSSIBLE - * MAF sensor (Mass Air Flow Sensor) has gone BAD causing car to start then shut back off . * Security has kicked in ( Due to changing stereo system or battery went dead or didn't have one on it for a little while .
FIXES - *Replace Mass Air Flow Sensor (in between the throttle and the air filter box) . * Take to Dealer and have computer Flashed/Reset if SECURITY is at Fault . I recommend the MAF sensor
Hope this Helps , Flaming Ratchets Auto Repair

Dec 05, 2013 | 1990 Pontiac 6000

1 Answer

99 mpv missfires,splutters.wont idle & has no power. when MAF is disconnected runs a lot better. I replaced the Maf but still does the same.The problem started suddenly,drove to work ok but when i


replace fuel filter, clean fuel injectors.could have bad fuel, do a code scan before buying new parts.faulty egr valve or faulty engine coolant temperature sensor cause engine run poorly.replace spark plugs and wires because if spark plug wires is bad or spark plug and ignition coil is bad that will cause rough idling misfiring and stalling you have dead cylinder not firing properly..

Oct 01, 2012 | Cars & Trucks

1 Answer

Car stalling


How old is the air filter? Replace if dirty. Did you adjust spark plugs to correct gap when installed?

Check sensors, particually maf sensor, may need replacing or cleaning. Maf sensor is located on the intake pipe from the air filter. Can buy the cleaner on eBay, 'maf cleaner'. The maf sensor measures air flow telling the injection how much fuel to use.

Also if there is a crank or flywheel sensor, check it's ok.

Sep 05, 2012 | 2000 Oldsmobile Alero

3 Answers

CAR STARTS THEN DIES OUT, WHEN IT IS RUNNING WHEN YOU GIVE IT GAS QUITS RUNNING. CHANGED FUEL FILTER AND AIR FILTER HAVE A HALF A TANK OF GAS


you could have a bad MAF sensor...try unplugging it and driving it around and see what happens. also make sure airfilter is clean. check fuel pressure if above does not work! the fuel cut valve may be the culprit. if it is the maf sensor, you can go to any auto parts store and buy a can of maf sensor spray to clean it. just follow directions on can. do not hit center of maf sensor with the straw on spray can, for these buggers cost over 100.00 new. unless you get one from e-bay or a junk yard. good-day! and check all vacuum lines good.

Aug 22, 2011 | 1993 Subaru Impreza

1 Answer

2002 SILVEROADO 5.3. I was drivig down the road, started acting like it was running out of gas than stalled. No whrilling fuel pump sound, I checked all relays and they were ok, New fuel pump did not fix,...


The fuel filter wont keep the pump from working but it can restrict the flow of fuel. Just to see where your pump is at smack the tank hard one time. If the pump is malfunctioning it will most likely turn back on.

Apr 06, 2011 | 2002 Chevrolet Silverado

2 Answers

93 volvo 850 glt changed the fuel pump now car wont start. Engine cranks, fuel pump working, fuel getting to the motor but it wont start. The car had trouble starting sometimes so i changed the fuel...


Check your fuel pressure to ensure proper pressure to the block, also did you replace the fuel filter.

On a side note: 3 things a automobile needs to run

AIR-make sure you have a clean air filter and your MAF (mass air flow sensor is plugged in) if you pulled your breather to innspect anything, there is a possibility that it came unplugged or you unpluged it and forgot to hook it back up, a car wont start without it being plugged in if equiped

SPARK-Make sure your car has juice to the plugs, if the plug doesnt fire the car wont run, if you have to pull each plug and ground them to the engine block to see if they arch. If not trace the problem down (if you changed the fuel pump you have some mechanical skill and should be able to troubleshoot a spark issue)

FUEL-Check for proper pressure, dirty fuel filter(s) and if your system has a return line, make sure your hoses didnt get crossed cause this will damage the engine and regulator.

Hope this helps Thanks for using Fixya.com

Jan 22, 2010 | 1994 Volvo 850

1 Answer

Turns over but wont start


OK three essentials for a running motor......

1. Fuel - Check to ensure you have gas up to the engine. Check fuel filter, fuel pump and fuel injectors.
2. Spark - Make sure your system has electrical current to fire the plugs. Check your wires to the coil(s) the plug wires, cap & rotor and spark plugs and gaps.
3. Air - Check to make sure any air flow sensors are connected, most cars wont run with the MAF (Mass air flow) sensor disabled. Check your air filter to make sure its not dirty. if it is it can restrict air flow and cause your motor to flood its self out instead of allowing the gas to ignite, hope you found my answer helpful!

Dec 19, 2009 | 1992 Volkswagen Passat

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