Question about 2001 Pontiac Grand Am SE

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Random Misfire of cylinders. I have changed the spark plugs and boots as well the coil packs and towers. We have pulled the fuel injectors and check them also.

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Look for a vacuum leak.

Look at your scanner for fuel trims, if it adding that is a sure dign of a vacuum leak.

When all else fails you will need a REAL scanner with MODE 6 if what you have does not have the misfire counters as part of the normal PIDs.

$50 code scanners will not do what you need, it may be time to find a shop with a real tech, look for a shop that has a tech with an ASE L1 certification.

The only other alltenative you have is drive it until you can get a miss on a particular cylinder. (but that may not happen)

If it was in front of me I would be scanning cylinder misfire counters under MODE 6.

Posted on May 16, 2010

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Check for intake manifold gasket leaks or leaking vacuum hoses these problems cause a lean cylinder condition and this triggers the P0300.

Posted on May 16, 2010

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1 Answer

After changing the coil pack and spark plug, why is it still skipping?


Timing could have jumped. Could be a bad head gasket also. even possible to be a small hole in piston check the cylinder for compression. Check the fuel injector to that cylinder if you have bad air to gas mixture it will throw a code of misfire change fuel filter check fuel injector to see if clogged. most likely it is the fuel injector .

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I have a 1996 chevy Corsica with a code PO300.I have tried many repairs and still cannot repair this code


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Seeing as you have covered all the electrics, now concentrate on the injectors and fuel pressures
If you will do all injectors and the fuel pressure is where it is supposed to be ( pressure test) then you will have covered all bases
Low compression will be in the one cylinder only ans will remain in that cylinder regardless of injector or plug changes
I would leave that to the last resort as if it is random, it may be a loose valve seat insert that moves randomly causing a compression problem

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P0300 Random/Multiple Cylinder Misfire Detected, the 304 is for cylinder number 4 any of these could be wrong 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

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Hello I have a1997 xk8 runs great but my check eng. light came on and the code that it read was a misfire code were do I start troubleshooting.


If it was a specific misfire code go to that cylinder and check the following: plug, wire, and coil, if it is a random misfire code, start by checking your spark plugs(including the gap), plug wires, and coil packs.

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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

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I have a ford explorer 99 but it's giving a error code PO306 what do u think it is


It sounds like a misfire. Check spark plugs 5 and 6. It could be bad fuel, bad plug wire, or weak coil. Check the fuel injectors as well. Other possible causes could be an egr valve stuck open, vacuum leaks, low fuel pressure.

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1 Answer

Code p306 misfire on injector 6


Random misfires are usually caused by a leaking vaccum pipe, and will only be apparent at idle and sometimes at low engine speeds under part throttle.
Isolated misfires are usually caused by a faulty injector, coil pack, ignition lead, or low compression.

Well, you're going to have to check the spark plug,  spark plug wire, the coil pack, low compression, and the ignition lead, which only really leaves the injector, or even an intake leak at the offending cylinder. 

Start the engine and then spray intake spray or the like around the intake at the offending cylinder and see if the engine note changes. If it does, then you have an intake leak, otherwise, they need to check the injector in the offending cylinder. 

Good luck and hope this helps. It might just be time for a tune up: new spark plugs and wire or some fuel injector cleaner every fill up for now.

May 05, 2009 | 1998 Oldsmobile Eighty Eight

2 Answers

Misfires and codes PO316, PO306, & PO305 popped up on the diagnostics check. What needs to be fixed based on that?


You will need to replace no 5 and no 6 coil pack and spark plugs. P0316 is random missfire that computer could not detect the cylinder that was causing it,just knew one was missfiring.
Coil packs are common concern on these vehicles. Can get oil leak into the coil pack wells and may also even get moisture into them.
If yours is a 3.9L it may be involved in owner satisfaction program 07M07 or 07N09 in which they will cover them under the program for up to 10yrs or 100000 miles which ever comes first.

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