Question about Pontiac Firebird
When i turn the key off and start it back up, the problem is gone. Then within a minute or two it comes back. I can smell really rich exhaust. Black smoke, backfires.
A tune up will be appropriate like spark plugs,cap rotor,clean throttle body,fuel filter, let try that first and look for PCM code
hope it helps
Posted on Mar 23, 2014
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Posted on Jan 02, 2017
Could be a number of different things.Fuel pressure relief valve not working,injector pulse too long,Is the air box lid securely fastened and air cleaner clean.Are there no leaks between the air box and throttle body(intake tube).Have you checked oxy sensor.air flow meter may be also possible.Try squeezing the flexible fuel hose enough to allow the engine to run and see if the engine reacts better if it does you have excessive fuel pressure.
Posted on Nov 20, 2008
SOURCE: Rough idle until warm 22r
if it is a carburated engine it is probably the a.a.p. diaphragm in the carb. if you remove the air cleaner and look on the side of the carb that is towards the valve cover near the front yow will see a vacuum hose going to a cover that is fastened with 3 screws. if you pull the vacuum line off you will see that there is probably fuel being sucked into the line due to the leaking diaphragm. the vacuum source is temp controlled and cuts off when warm. but when cold sucks fuel directly into the intake. remove the 3 screws to replace the diaphragm, being carefull of the spring. good luck!
Posted on Dec 18, 2008
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