Question about 1999 Pontiac Firebird
Pulling a p300 multiple misfire code. Changed plugs, wires, coils, injectors, and lifters. Narrowed it down to cylinder 3. Took it to the shop, which it has been sitting for 3 weeks, they claim they fixed cylinder 3 but now something is wrong with cylinder 4. They say it could be valve guides. Any suggestions?
I hope you used all factory parts, it makes a difference. Compression test? nope valve guides I really doubt it
have someone do a smoke test for vacuum leaks you can have a sucked intake manifold gasket smoke test is really the only way to find a small vacuum leak
contact me at firstname.lastname@example.org with any questions and feedback please
Thank you, Randy
Do we know for sure that the PCM (computer) is actually firing all the injectors? you need a
NOID LIGHT for this test
Posted on Sep 17, 2008
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Posted on Jan 02, 2017
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