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Re: What are the probable causes of DTCs P0300, P0301, an...
My guess would be the intake manifold gasket. 3.1 and 3.4 are bad about blowing these. But first do a compression test on #1. Little or no compression would be a head gasket. Pull out #1 spark plug, get the piston close to the top. Does it look really clean? Then its the intake. Coolant getting in the cylinder.
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Locate the ignition coils - they are mounted on the ignition module. Remove the wide connector that goes to the module. You will have to unscrew it first. Spray some WD40 on the connector pins and try to scrub them with a tip of a small screwdriver. Be delicate not to brake or bend anything. Reconnect the connector. Start the engine and see if it still misses.
If it still does, try to touch/move each of the wires that go to the ignition module. BE VERY CAREFUL not to touch any of the moving parts of the engine as you have to do it with engine running.
If it still misses, do the following.
1. Engine off
2. Mark the ignition wires so that you reconnect them later in the same order
3. Locate the coil which gives spark for cyl 1
4. Switch locations of this coil with any of the two remaining coils
5. Reconnect the wires
6. Start the engine
If it now misses on another cylinder, you will have to buy a new coil.
Possible Causes: - Improper spark plug at cylinder #1 - Insufficient compression at cylinder #1 - Incorrect fuel pressure - The injector circuit is open or shorted at cylinder #1 - Fuel injector #1 may be faulty - Intake air leak at cylinder
Possible Solutions: - Perform Injector Service - Replaced Spark Plug #1 - Replaced Injector #1 - Replaced Ignition Coil #1
Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.
The very first thing that you should do after finding a cylinder mis-fire that can not be easily explained such as a fouled spark plug, is to take a compression test especially of the mis-firing cylinder to be certain that the mis-fire is not caused by a mechanical problem, and I have seen people spend a lot of time and money trying to hunt down an electrical problem when the actual problem was a mechanical one, and no electronic part will repair a burnt or bent intake or exhaust valve.
Firts time swap spark plug & ignition coil between two different cylinders and read again if the same #2 cyl. misfires ! If #2 cyl. is OK and another cyl. misfires then spark plug or ignition coil is out of order and must be replaced. If #2 cyl. misfires again then #2 injector must be checked ! If ignition coils & spark plugs (complete set for 6 cyl.) are replaced then you must check #2 injector !
Have you replaced the spark plugs?? Use good plugs such as ngk. Look for signs of carbon tracking on porcelain (black dirt looking marks that can NOT be wiped off. If present replace spark plug and coil boot to repair.
it sounds like you may have the wires on the wrong coil. It should be #1 on the #4 coil, and the #3 wire on the #2 coil. you probably have them backwards so 1 and 3 are firing on the exhaust stroke. the firing order is 1-3-4-2. they should be hooked like this.