Question about 1999 Pontiac Grand Am GT

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Replaced wires and spark plugs on a 99 Grand AM GT. Running rough, check engine light comes on and catalytic converter runs very hot.

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YOU NEED TO START WITH THE CHECK ENGINE LIGHT ADVANCE AUTO PARTS DOES IT FOR FREE MOST SHOPS ARE CAPABLE OF LOOKING UP THE CODE AND TELLING YOU WHAT IT IS

Posted on Jul 29, 2009

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2001 ford ranger 3.0. trouble codes p0174 and p0304. replaced coil,wires,plugs,.ran fine for a while light is back on again same codes.running down highway light blinks.come to a complete stop light goes...


The light blinks to let the driver know the problem is serious enough to damage the catalytic converter.
If you know for a fact cylinder 4 is getting a hot spark, it could be the fuel injector. Code 304 means there is no power from cylinder 4.

Jan 24, 2014 | Cars & Trucks

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2002 pontiac grand am se1 6cyl is idles rough


what mileage,spark plugs,fuel filter[,coils module,this #1]

Feb 22, 2013 | 2002 Pontiac Grand Am SE

1 Answer

P0302 code


A code P0302 may mean that one or more of the following has happened:Faulty spark plug or wireFaulty coil (pack)Faulty oxygen sensor(s)Faulty fuel injectorBurned exhaust valveFaulty catalytic converter(s)Running out of fuelPoor compressionDefective computerPossible Solutions
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.

Mar 08, 2012 | Cars & Trucks

1 Answer

Diagnostic code error P0306 and P0420 on 2003 Pontiac Grand Am GT


this obd2 trouble code table can help you understand the meaning of code.
and for p040,you can try:

Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2), replace if necessary
Replace the catalytic converter
for p0306, you can try
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.

Aug 13, 2011 | 2003 Pontiac Grand Am

1 Answer

We have code p0304 on our 2001 chrysler voyager(with 220,000 miles) it runs rough and runs worse when ac is on. we tried to change spark plugs, gas cap and air filter. The check engine light was then...


P0304 Cylinder 4 Misfire Detected,A code P0304 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 symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs).. I would suggest spark plugs, spark plug wiresmag-glass_10x10.gif, 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.

May 31, 2011 | Chrysler Voyager Cars & Trucks

1 Answer

2001 ford ranger, 3.0L running rough, seems like cat converter getting hot too, could this be a bad coil pack, plugs and wires look ok


Start the engine and let it idle.Pull off the spark plug wires one at a time(wear leather gloves or use a plug wire tool to avoid being shocked).The wire that you pull off that makes no difference to the way the truck runs is the problem.If a set of plugs and wires don,t fix the problem,remove the suspect plug and check to see if it is firing by laying the metal portion against a good ground and then have someone turn over the engine while you watch for spark,if you have spark then you likely have a plugged catalytic converter,if there is no spark then you need a coil pack.

Sep 12, 2010 | Ford Ranger Cars & Trucks

1 Answer

Engine running really rough...whine sound when it isn't.


The run rough problem is due a cyl.mis firing,it becaused buy a bad plug,plug wire,coil,or even the ing.module. the servive eng.light flashing is warning you that you have a cyl.misfire that can cause damaget to your catltic converter if you continue to drive it.with may lead to why you think you have a exhaust problem,it may be colgged.

Dec 27, 2008 | 1999 Pontiac Grand Prix

2 Answers

88 toyota has little power when gas is pressed


your engine seems to be running rich. that may be do to a bad spark plug, spark plug wire, bad distributor cap. If you have a 22re you should check for trouble codes by jumping TE1 and E1.
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You should also check your engine timing. With a timing light. The timing marks are located on or above the oil pump. keep in mind in order to get timing right you must have TE1 and E1 jumped. Set to 5 degrees advanced. If your engine is improperly timed it will accelerate slowly, and get worse mileage.

Also adjust/Check engine valves appropriately. they will cause low power.

Also does it misfire at idle?

Oct 22, 2008 | 1988 Toyota Pickup

2 Answers

Rough Idling and slow accelaration


have you the intake off? if so check for trash in the fuel ejectors. I had the same problem, I just replace the fuel meter body with one from the junk yard

Jul 12, 2008 | 1999 GMC Jimmy

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