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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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

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1 Answer

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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

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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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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.

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