Question about 2003 Pontiac Grand Prix

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Multiple misfires 2003 pontiac grand prix i have changed spark plugs,wires,coils all three and my crank postion sensor. I am still getting a multiple misfires code, i dont know what the problem my be. it was cuttin off before this work was done but now it puts our black smoke and smells like burnt fire crackers when i drive.

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Try to chang the module that worked for me

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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3 Answers

Can catalytic converter on 98 Pontiac grand prix cause misfire on cylinders in car


No, a plugged converter would cause the engine not to breathe properly. Too much back pressure would stall the engine or make it run very poorly. It would not be local to any one cylinder-all of them would be affected.

To diagnose a misfire in one cylinder, well, you start at that cylinder. It could be ignition related- the spark plug and spark plug wire for #6, possibly the ignition coil for #6 in the coil pack for the engine. (A v-6 would have 3 coils in the coil pack, one coil for 2 cylinders.) It could also be fuel related, so the fuel injector for cylinder 6 should be considered. And the last reason for a misfire is usually the most expensive repair: low compression in #6. This may be a head gasket problem, or a piston ring problem, or one of the valves for #6 may not be sealing well, causing low compression and the resultant misfire. The engine computer codes a misfire when it senses low power output from that particular cylinder. The misfire causes a lag in crankshaft rotation, and the crankshaft position sensor senses it.

Feb 01, 2015 | 1998 Pontiac Grand Prix

2 Answers

My 2001 grad prix stumbels at acceleration once in awhile and in park sometimes there is no engine codes and i've changed pretty much everything plugs wires coils fuel filter and i even cleaned th


You did oxygen sensors at 100,000 miles

No exhaust leaks

No intake or evap leaks

Changing parts doesn't answer the question
Do you have ignition misfires

Egr problems

Mar 13, 2013 | 2000 Pontiac Grand Prix

1 Answer

2006 pontiac grand prix recevied code P0303, changed spark plugs, wires, and fuel injector. Car still shakes and check enigine light is still on. Acceleration is fine.


Spark plugs,wires and injectors, have nothing to do with your problem

PO303 is a misfire on cylinder #3
You may have an individual cylinder coil for that cyl or a coil pack for
several cyl,don't know the engine you have.

You may also have other issues that are causing the shaking

Nov 28, 2010 | 2006 Pontiac Grand Prix

1 Answer

1999 grand prix gt 3.8v 6 error codes 300 and 302


The PO300 code is random/multiple cylinder misfire detected. Sinsc you have the code PO302, that means that cylinder 2 is the one misfiring, usually a bad coil pack, or spark plug.

May 12, 2010 | 1999 Pontiac Grand Prix

2 Answers

Not getting any spark 1995 pontiac grand prix se 3.1 engine please help


the cheapest and quickest way to check for spark is replace your crank sensor if youve done this and you still have no spark then try a coil pack.

Mar 27, 2010 | 1995 Pontiac Grand Prix

1 Answer

I ran a scanner on my 2002 pontiac grand prix 3100 V6 and it reads out as multiple misfire i already changed the spark plugs,what could the problem be?


A code “multiple misfire” may mean that one or more of the following has happened:

•Faulty spark plugs or wires
•Faulty coil (pack)
•Faulty oxygen sensor(s)
•Faulty fuel injector(s)
•Burned exhaust valve
•Faulty catalytic converter(s)
•Stuck/blocked EGR valve / passages
•Faulty camshaft position sensor
•Defective computer

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.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Feb 01, 2010 | 2002 Pontiac Grand Prix

1 Answer

1992 pontiac grand prix cranks but will not start


there is a module that the coil pacs plug into, it may be bad or have a bad connection

Nov 21, 2008 | 1992 Pontiac Grand Prix

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