Question about 1999 Pontiac Firebird

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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?

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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 fixincars@yahoo.com 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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Firebird v6 multiple missfire p300 code and trouble starting.


- Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient cylinders compression - Incorrect fuel pressure What does this mean? Read more: http://engine-codes.com/p0300_pontiac.html#ixzz2jdmmbwJ9

Nov 03, 2013 | Cars & Trucks

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My 1999 firebird has been on a computer and a firing problem for number 5 cylinder came up, changed plugs and plug wires and its still doing it what else could cause this problem


Misfire #5 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps.

Oct 06, 2011 | 1999 Pontiac Firebird

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I have a 1999 Pontiac Grandam that is pulling code P0300. I have changed the head gasket, plugs, boots, both coils, ignition module, crank and cam sensor's, had to get a new timing chain tensioner and...


The only thing left would be fuel. Check fuel pressure , replace the fuel filter, and check the injectors(ohm's from 11 to 15) and the injector harness. Mostly on the harness make sure you didnt pinch a wire putting it back together, especially the map and coolant wires.

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#2 cylinder misfiring....changed plug and plug wire....still misfiring....what other situations could be causing the misfire??


Other causes could be: faulty coil; faulty fuel injector; poor compression; defective computer

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2000 Kia Sephia p0303 code engine misfires


do a compression test. cylinder 3 could have a bad valve lifter or valve.kia sephia dont have push rods.it have a bucket type followers.a intake leak to that cylinder can also cause misfire problems.

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1 Answer

1999 Pontiac Firebird multiple misfire


It could be a clogged fuel filter, bad gas. Or if you have done alot of modifications to it, the injectors may not be able to keep up.

Sep 17, 2008 | 1999 Pontiac Firebird

1 Answer

2001 Firebird 3.8 misfires


Check your alternator see if you have a drop in voltage on your tack,then it is the problem.I too was a victim of high price tune up and still had a problem with a misfire.and cover your coil pack with a piece of rubber water run of onto your power pack .Another thing is to use a silicone spray on all wires.

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