Question about 1999 Pontiac Grand Am GT

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My Pontiac Grand Am has been misfiring and I replaced the coil packs and spark plugs(Dalco) and wires. My fuel pump was also replaced. It ran fine for a a few days and now is misfiring on cylinder one. Any ideas on how to fix this?

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  • lilfish9 Sep 05, 2010

    2000 Grand Am misfiring on cylinder one: When fuel pump replaced, tank was flushed and new fuel filter installed. Fuel injector is working as spark plug is wet. Head gaskets were replaced a year ago. Car has 135,000 miles on it.

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  • Master
  • 1,297 Answers

Assuming the CKP is ok then you need to do a compression test next

Posted on Sep 05, 2010

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  • Pontiac Master
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The most common misfire causes on the cars I've worked on have been:

  1. Spark plugs
  2. Spark plug wires
  3. Ignition coil
  4. Fuel injector
  5. Wiring to fuel injector
  6. Timing Belt
  7. Vacuum leak or stuck open EGR
  8. Contaminated fuel or bad fuel pump
  9. Weak compression
  10. Blown head gasket

Obviously there are many different types of cars, so a service manual for the specific one that you are working on may be required to help pinpoint the misfire you're looking for, but hopefully this will direct you to some of the most common causes of misfires in cars of today.
When diagnosing a SES light, it's best to start with a quick scan with a code reader. If checking the engine's mechanical integrity specialty tools, like a compression tester, an exhaust back pressure gage or cylinder leak down tester may be needed.

Posted on Sep 05, 2010

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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

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

Code P0300 on a 2002 Pontiac GP with misfires on # 1&3. replaced plugs & wires checked coil packs. this occurred after the car stopped along side road with bad water pump.


try switching one of the other coil packs with one of the bad ones. if this works then there you go. another way of telling if it is a coil pack is to disconnect the spark plug of the affected coil pack. if its a strong coil then you will hear the spark as well as see it. compare it to another plug boot that has the good spark. it sounds to me that it is a coil pack. i just changed one about 2 months ago with the same problem as yours.

Apr 17, 2010 | 2002 Pontiac Grand Prix

2 Answers

I have a 99 grand am SE 2.4 4 cylinder and my problem #2 misfire, repalced spark plugs with AC delco rapid fires, replaced coil packs, replaced coil pack housing, changed spark plug boots, had ignition...


A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.

Feb 25, 2010 | 1999 Pontiac Grand Am GT

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

2 Answers

Pontiac Grand Am 97'


di you change the spark wires? is there a change you changed wires and with that you changes the spark sequence?, if so swap the wires from those cyl.
hope it helps

Dec 22, 2008 | 2000 Pontiac Grand Am GT

3 Answers

Pontiac Grand Am 97'


if it is a 4cyl probably a bad coil cover

Aug 21, 2008 | 1997 Pontiac Grand Am

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