Question about 2001 Pontiac Grand Am SE
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Posted on Jan 02, 2017
Well, the code simply means that the engine has... a random misfire. As to why, that's going to take some work. Is it fuel, timing, compression, or electrical? I'd start with a compression test. Then throw a timing light on it, check for play on the valve train, run some fuel cleaner through the tank, and check your electrical connections. Hopefully, something will pop up. Good luck!
Posted on Nov 23, 2008
I'm a bit confused concerning your spark plug wires as the standard 2.2 engine does not have them, so my suggestion is based on the 2.2 engine as the 4 cylinder you state you have.
If the secondary electrical has been replaced, I would suggest inspecting the fuel injectors for operation.
The easiest way to test the operation of the fuel injectors is to listen for a clicking sound coming from the injectors while the engine is running. This is accomplished using a mechanic's stethoscope, or a long screwdriver. Place the end of the stethoscope or the screwdriver (tip end, not handle) onto the body of the injector. Place the ear pieces of the stethoscope in your ears, or if using a screwdriver, place your ear on top of the handle. An audible clicking noise should be heard; this is the solenoid operating. If the injector makes this noise, the injector driver circuit and computer are operating as designed. Continue testing all the injectors this way.
If all appear to be functioning we can move on to the next suggestion.
Let me know.
Posted on Mar 31, 2009
How do you know the spark plugs are good??
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.
Posted on Aug 24, 2009
mine just had that problem...its your M.A.P...I went to the shop to get my check engine light to go off and it said my MAP was bad so i had it fixed and I dont know what they did but after they put it on my car started misfiring...I just left mine unplugged and it runs like new...but if i plug it up my car misfires again...
Posted on Mar 07, 2010
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