Question about 1996 Chevrolet Camaro

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Plug wire burn spots, spark plugs fouling, loss of power, misfire

Mid oct., sudden loss of power. all wires & (terribly fouled) plugs replaced, along with 1st coil
two wks. later, after 240 miles, when slower, same mis-fire
worked on/ replaced @gm cert.
again after 2 hr. drive , it happens again.

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Optispark distributor fails. go to summitracing.com and search optispark. it'll pop right up

Posted on Jul 12, 2009

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2004 Dodge durango motor shakes an reading cylinder 5 misfire


seems like you have a fouled spark plug or bad spark plug wire or even both. If you can change that on your own, just pull the #5 plug and see if its fouled, it will look black and covered in carbon. once you have the one plug out its a good idea to just change them all out along with the plug wires.

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If plugs helped...the problem went away...then it could be a plug getting fouled by excess fuel or oil. Look at your new plugs and see if they are discolored or went with gas. could be an injector problem. It could also be an ignition problem. You moved the plug wires around and they worked for a few minutes till the new "connection in the wire" burned up. Check your plug wires with an ohm meter. Check your plugs for fuel or oil on plug...a sign of stuck injector, oil leak, misfire. Did it really help or was it just wishful thinking?

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Hi I have Lexus Rx300 year 1999. The problem is, some time when I start the engine, I noticed that the RPM meter shows low and the car little viberate and engine stops. But if in-between I push...


REPLACE SPARK PLUGS AND WIRES AND CLEAN FUEL INJECTORS. SOUND LIKE FUEL INJECTORS LEAKING FOULING OUT SPARK PLUGS WHEN YOU TURN OFF ENGINE.WHEN YOU START CAR UP NEXT MORNING CYLINDERS MISFIRING SO BAD FROM FOUL PLUGS ENOUGH SHAKE ENGINE.WHEN ENGINE RUNS FOR FEW MINUTES THAT WILL BURN OFF FOUL SPARK PLUGS UNTIL ENGINE RUN NORMAL.

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Feels like its stuttering when i drive it (feels like it is gonna cut off)


Possible causes for your problem are:
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  2. Bad spark plug wires
  3. Fouled spark plugs
  4. Bad MAF (Mass Air Flow) sensor
  5. Bad TPS (Throttle Position Sensor
A visual inspection of the top 3 should take the least amount of time. Look for cracks in the distributor cap, burned spots inside the cap, bare spots on the spark plug wires. Pulling a spark plug and looking for evidence of oil to determine if it's been fouled.

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hoopers51, Code 304 is for a misfire detected on cylinder #4. Check the wire and the spark plug for that cylinder. Make sure that there is no corrosion in the boots of the wire and see if the spark plug is fouled up, or wet with gas. If the plug is fouled (a normal firing plug will have a grayish color to it) clean it and replace it. If the wire is bad then replace it. Make sure that there is no corrosion on the coil terminal when you pull the wire off. You might want to test the coil if you have an inline spark tester. These can be purchased very cheaply at any auto part store. Also what you can try is to remove the plug on the #4 injector when the engine is running. DO NOT try this with the spark plug wire. (Do this when the engine is off) When you disconnect the injector you will hear a misfire if it is working properly and this will tell you that the injector is not the problem. If there is no change then you should check for power to the injector. (once again, when the engine is running) The injector on that cylinder may be weak and is leaking. This will dump too much fuel into that cylinder causing the misfire and you will have a wet spark plug. All of these, a bad wire, a bad spark plug, a leaky injector or one with no power, or a bad coil will cause a misfire and will increase the HC's on an emission test. Good luck with this.

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I have a 2001 Jeep Grand Cherokee with a 6 cyl engine. While driving Saturday afternoon it suddenly started shaking and the check engine light started flashing. After a few minutes the light became steady,...


Even though the plugs are "new" it can get fouled out. Soon as you put in a new set, one could go bad on start up. The plug wire could have hit a hot surface and burned into the insulation causing a spark jump. You can check the wire by holding a screwdriver in the spark plug end and holding it 1/4' from a metal surface. Have someone to turn the engine over to see if you have a nice blue looking spark jumping from the screwdriver to the metal. Also, at night start the engine and look under the hood for any sparks jumping from the area. you could also have a misfiring injector but I would put that at the end of list.

I would check for jumping sparks first, then install a new plug in #2. Right now you would only be out of $2 for the plug.

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Main causes of misfire would be loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression.

Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

"Lean misfire" can occur when the air/fuel mixture is too lean (not enough gasoline in the mixture) to burn. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator.

Loss of compression means the cylinder loses most of its air/fuel mixture before it can be ignited. The most likely causes here are a leaky (burned) exhaust valve or a blown head gasket. If two adjacent cylinders are misfiring, it's likely the head gasket between them has failed. Also, if an engine is overheating or losing coolant, it's likely the head gasket is the culprit.

You can isolate the weak cylinder by temporarily disconnecting each of the spark plug wires, one at a time, while the engine is idling. When there's no change in the idle speed, then you have pinpointed the weak cylinder.

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Engine light has come on and car is misfiring, loss of power, sounds rough


Main causes of misfire would be loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression.

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"Lean misfire" can occur when the air/fuel mixture is too lean (not enough gasoline in the mixture) to burn. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator.

Loss of compression means the cylinder loses most of its air/fuel mixture before it can be ignited. The most likely causes here are a leaky (burned) exhaust valve or a blown head gasket. If two adjacent cylinders are misfiring, it's likely the head gasket between them has failed. Also, if an engine is overheating or losing coolant, it's likely the head gasket is the culprit.

You can isolate the weak cylinder by temporarily disconnecting each of the spark plug wires, one at a time, while the engine is idling. When there's no change in the idle speed, then you have pinpointed the weak cylinder.

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