Question about 1999 Pontiac Firebird

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1999 fire bird wont start

It was running fine died and now it wont start its a 1999 fire bird 3800 v6 i cleaned the mass air flow sensor with the cleaner for it hate to buy new on if thats not the problem because they are expensive ive also changed the plugs it turns over tries to start but just wont stay running i

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Sounds like a fuel problem, when was the last time the fuel filter was chg.? If that is not an issue, than a fuel pressure test is in order, It should have around 48 to 50 p.s.i.

Posted on Jun 16, 2009

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Posted on Jan 02, 2017

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My 2003 Astro van has been running fine the I got gasmonday night and as I pulled out the gas station it spit and sputtered like I got bad gas or trash in filter, then it started working fine.


Mass air flow sensor maybe drity or going bad . Ever had it replaced ? Have you replaced the air filter lately ? Video's on youtube showing how to clean mass air flow sensor , you would have to buy a can of mass air flow sensor cleaner . Also while your at it clean the throttle plate , again there are videos on youtube . How did you check fuel pump ? To do it right you would need to hook up a pressure gauge . Also check flow .Videos on youtube .Has the check engine light come on ? Also you mite try some fuel injector cleaner and or dry gas for moisture in the fuel !

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Starts fine when cold but after a few minutes shut it off then wont start unless u pump the heck out of it then black smokes comes out tailpipe


Sounds likes burning to rich..did ya get any codes out of it...A bad engine coolant sensor can make it do that..or a mass air flow sensor..Need to try and get the codes out of it..Try and disconnect the mass air flow sensor ..It might not idle but it should clear up and run..

Sep 04, 2011 | 1999 Ford Expedition

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98 sia 4.3 v6 turns over fine. fires a little and dies. I can feather the gas to get it started but have to keep the foot feed open for a bit because it won't idle. I have replaced the fuel pump, and...


Could be a couple of things. First check the fuel pressure because it could be a clogged fuel filter or a bad fuel pump. Also could be throttle position sensor or mass air flow sensor.

Jan 06, 2011 | 1998 Chevrolet S-10 Pickup

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Start car is fine but once hits idle speed the engine hesitates and then dies. I disconnected the mass air flow sensor and car ran better, then hooked it back up and the engine died instantly. Is this a...


i would agree with your diagnosis. i had a similar problem with a crown victoria. disconnecting the maf sensor made it run better. i replaed the sensor and have had no problem since

May 08, 2010 | 1999 Subaru Forester

1 Answer

Code po171 7 po174


your computer is reporting bank 1 and 2 too lean, usually caused by the mass air flow (MAF) sensor, you can usually clean this sensor and reset the light. Clean it with electric cleaner or brake cleaner, make sure it is dry before reinstalling, also take care not to damage it. Hope this helps, let me know

Jun 09, 2009 | 1997 Ford Thunderbird LX

1 Answer

Car wont stay started


If air filter is the round type then remove it and see it the black cone on the end of it didn't come loose and **** up inside the filter so it is blocking air to the Mass Air Flow Sensor. If that is ok then clean the MAF sensor bulb with a good electrical cleaner then let it air dry before hooking back up and see if this corrects it.

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1999 pontiac grand prix . will not run


If you unplug the MAF sensor it should run using the default mapping. I'm having the same problem, but I want to figure out why it won't run with the sensor connected.

Jul 03, 2008 | 1999 Pontiac Grand Prix

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