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Engine still skips on 1996 gmc truck already replaced spark plugs wires cap and rotor?

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2011-09-13 02:36:18
2011-09-13 02:36:18

you never said fuel filter. or if service engine soon lite is on.try filter if problem persists check compression if ok possible pickup coil and or control module.mybe its my mistake but is ses lite on if not it still comes down to air fuel combustion. back to the gap of the spark plugs. are the wires a good brand same with dist cap and rotor check all before if you bumped the dist. very unlikly unless you loosened the hold down bolt.is the dist a nondisturbed type or disturbed ? that's a timing issue ok.

Answermake sure your distrubutor didn't get bumped and is causing crossfiring,just went through that and it will cause SES codes that aren't necessarly true.truck would sputter and sometimes backfire at low rpm's.you need a special diagnostic tool to acuratly set the distributor that displays the degree of the camshaft,i believe there's a mark on the underside of the dist. and a mark on the intake manifold to show if they are set right,but what i did was loosen the hold down bolt on the dist. and turn it all the way to the left that it would turn.then i would just bump start the ignition and then turn the dist. just a hair until i got it to where it would fire up with just the slightest bump on the ignition.there may be a better way to do it without the scanner tool but that worked for me.hope it helps.
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When you replaced the plugs, did you check the compression? Did any of the plugs look different than the others? Low compression in one cylinder can cause misfiring. But then, so can a faulty distributor cap.

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What year? What engine? Spark plugs or rotor? A more specific question is required.

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yes it has a cap and rotor. its just located on the front of engine a timing chain cover. it has 8 pins and can be replaced. Also rotor can be replaced.

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Code P1399 means:Random missfire Plugs not gaped right might want to check them since you just replaced them or plug wire loose?

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You don't. It has a D.I.S. ignition system and has no distributor or rotor. There are three coils mounted over spark plugs under coil pack cover (center top of motor) Each coil fires 2 pistons. They are not replaced as a tune up item. They are only replaced if faulty. Spark plugs should be replaced every 15,000 miles.

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depending on the engine size they will be located in the sides of the heads. look for a rotor cap and 6 or 8 big wires, depending on the engine, then foller them rihgt down to the spark plugs.

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my s- 10 did the same thing i replaced to dist cap rotor and plugs it helped

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Check the timing and the pointsAnswerWhen you change the plugs and cap and wires you have to make sure you get the right wires to the right plugs that's usally the probelm is that the wires don't get put back with the right plugs. AnswerMake sure the before you remove the rotor note which way rotor is pointing and make sure that you install the new rotor pointing in the same direction. The it should wok if you haven't removed the distributor. If you don't remember which way the rotor was pointing just try switching the rotors position. Note: Not all distributor rotors can be mounted in different ways and some only mount one way.

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Check and clean spark plugs distributer and rotor change air fillter and oil change wont hert

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Your coil needs two things: power, which you have, and a trigger(i.e.) a hall effect switch or a camshaft sensor. Without a trigger it will not spark at any plugs because its not being told to. Hope this helps you out. If that doesn't work then try grounding your engine more to the body if you haven't already.

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replace the ignition leads then try the coil aswell Plugs, wires, cap, rotor, injector, internal engine, etc.

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full tuneup, plugs, wires, cap/rotor, air filter, fuel filter etc.


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