Question about 1997 GMC Sierra

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Ive changed cap, rotor, plug wires, and plugs. Now my engine light is on and it has a slight miss?? firing order is good, is there a wrong way to put a rotor and cap on??? it is a 97 5.0L gmc. thanx

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Yes you could have put things on wrong. did you make sure the # 1 cilinder was at top and the rotor is pointing at that piston? double check the wires as you put them back on and look on the top of engine for the plug #'s and the patteren. If that does not help then you may be off time.

Posted on Jul 14, 2009

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No they only go on one way. If it ran fine before you replaced all those things, you could have gotten a defective part. Try and pin point which cylinder is misfiring, put the old part back in, and see if that cures it, if it does, the new part is defective.
I had a simular problem, only a little worse. I put all the old parts back in, and ran fine. I took all the new parts back, and told them they better notify the manufacturer about the junk parts they are making, and don't ever want that brand again.

Posted on Jul 14, 2009

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Yeah there is a wrong way. First try to rotate the distributor while it is running but only move it just alittle to the left or right. Also dont lossen the distributor bolt so that it can freely move. When it start sounding better then tighten the bolt and test it.

Posted on Jul 14, 2009

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I tuned my 5.2 didge engine, cap wires rotor and plugs, and also installed new valve cover gaskets. When I started it, misses, and check engine light on, what did I do?


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simple things first, did you put the rotor back in ? I would start by connecitng a timing light to one of the plug wires and have a friend turn the engine over and see if the light flashes. (I use a remote starter switch on fords but make sure the ****** is in park) If the light does not flash, connect the timing light to the coil wire. It should flash now. If it does, the plug wires might not be in the correct fireing order. if it does not , the problem should be under the cap if it was running before. if you dont have a timing light, lift the coil wire off of the cap and hold the conductor close to the cap, less than 1/4 inch. Have a friend crank the engine. You should see a blue spark. if you do, repeat with a spark plug wire. If you have spark, the wires are probably wrong. Be careful not to get shocked. It wont hurt you but wont feel good either. If you have no spark and everything is in order and the rotore is installed properly, disconnect the battery and remove the ignition box on the inner fender. Look at the bottom side. If it has an area that looks sandy (literally) replace it. This is common on the duraspark ignition systems.

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The distributor rotor turns COUNTERCLOCKWISE

The marked # 1 position on the distrubutor cap faces to the REAR and slightly towards the drivers side

The engine cylinders / spark plug locations are numbered :


firewall

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2 Answers

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1 Answer

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i would start with the basics- did you make sure you followed the correct firing order when you installed your new plug wires? when you changed the cap/rotor did you notice any track marks inside the old cap? was the old rotor burnt/corroded? ive got a 97 ram and the cap is a b*tch to get to being buried in the back, could you have inadvertently moved the rotor off its timing mark? mis-aligned the crank sensor when installing your new cap? i would recheck how the cap was installed, just because you were able to position it proper and tightened down the screws doesnt mean that you didnt accidently pinch the wires on the crank sensor, or turned the rotor off its mark. also when pressing on the plug wires on the cap did you look for the "1" mark on the cap? this is your reference point for firing order. im not sure these are you problems, but rechecking your work to make sure something wasnt knocked off-kilter, or wrong plug wire placement would confirm the problem lies other than what was replaced. i hope this helps

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