Question about 1988 Chevrolet C1500

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1988 chevy 3500 runs really bad!

I put a tune up in my truck and now it runs really bad, it has no guts up hills, and most of the time runs OK under 50 mph. I have been trying to trouble shoot it but getting no where. It ran great before tune up. Also I have found the coil wires has two sets of wires one red and one white. one red and one white go into the distributor the set has a red wire going into harness and the white wire just setting there with a plug-in end and no wires close to it. I feel this is my problem but can't find a wiring diagram.

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I have the same truck I've been looking for information on a different subject. I am an ASE technician I may know what might be causing your problem. First off the white wire on the coil that goes to nothing is your test wire it's not going to be hooked up unless you are performing a test to ensure that the coil is working. Just changing parts often times does not solve the problem and it can become very expensive and make things worst for the next guy to fix. it's going to be in one of two systems Fuel or Ignition since you just did things to the ignition system I'd start looking there check the firing order needs to know what engine you have before I can give you the firing order. is this a V6? V8 5.7? what all did you replace during your tune up? it could be that one of the plugs are not gaped correctly or tightened down which could cause damage to the head requiring the valves to ground to correct the problem. Your catalytic converter may also be causing the problem one the et hot and melt they start blocking the flow of exhaust. If you would like to read more on that check out this site it has some very good information.

Posted on Feb 13, 2010

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Check firing order,also there is a brown wire on right side of fire wall needs disconnected to put system in base time before setting timing@ distributor.once corrections to timing are made,shut truck off and plug wire back in and restart.firing order is 1-8-4-3-6-5-7-2 clock wise rotation on dist. cap.also check egr valve if doesnt clear up

Posted on Feb 09, 2010

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Seems than you have two wires cross over. The diagram you are looking for is call "firing order" and you can find in at register for free and look under /categories /vehicle repair guides/ engine electrical /firing orders/.
or you can go to your local Auto Zone and ask for the firing order.
they can print it out for you at no charge.
Good luck and if this helps you don't forget to vote :-).

Posted on Jun 22, 2009

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