Question about 1989 GMC Sierra
Did you use a factory rotor and cap, they sometimes act up with after market rotors? You may have damaged the distributor when removing the old rotor, if you pull too hard damage may occur. How about your coil, is it still original, may want to upgrade to a hotter set up.Check out if there is proper spark getting on each cylinder.
Test the voltages at each cylinder separately one by one.If the voltage is low or no voltage on any cylinder then interchange the connector of that particular cylinder and check .If still the same problem then its problem with the ignition coil it has to be checked and replaced.
You may have the wires in the right order, but check to see that you're not one post off. Put your engine on TDC of the compression stroke and check that rotor is pointing at the post you have the number one wire in.The after-market rotors are a no-no, because most don't handle the intensity of the stock coil and ground internally to the distributor shaft. Also get the fuel pressure checked.If its low then that can be other issue.At any local auto garage they will get the fuel pressure tested to confirm the fuel flow in the truck.
If there is no spark then the problem is with distibutor.check it. The main and the very common thing to be checked.In this many other users to face the problem.The connection of wires on the distributor . The wires in the wrong order on the distributor.Get the wires rechecked are they connected to there exact firing order positions or have they got interchanged or connected to wrong order by-mistake. or got loose. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.
Posted on Jul 07, 2010
Hi! Does it crank? If it does then you will have to move the distributor to find the timing. Once it gets the timing this will fire up. Hope this helps and have a good one!
Posted on Jul 07, 2010
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Posted on Jan 02, 2017
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