1989 GMC Sierra - Page 8 - Answered Questions & Fixed issues
Were is the connector to disconnect for ignition
You have to disconnect the brown wire thats on the firewall. It disables the computer controlled advance and allows you to set the base timing. Disconnect SET TIMING connector (tan/black wire) located in harness close to distributor. DO NOT disconnect 4 wire connector at distributor.
Thank you for using fixya and good luck, set timing is O".
7/17/2010 1:00:04 PM •
1989 GMC Sierra
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Answered
on Jul 17, 2010
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295 views
My clutch goes to the floor, can't shift. Have
Provided the mechanical portion of our clutch is good then you still have some air somewhere in the hydraulic system and it's often very hard to get out. One trick I use is to use my hand vacuum pump with a little cover I made to cover the fill hole on top of the master cylinder. I pump up about 15" of vacuum on the system and often that will pull out the few air bubbles submerged in the fluid that prevent the system from working. Once you get most of the air out usually the rest will work out if you press and release the clutch pedal several times. Sometimes it works very quickly, sometimes I've fought them for an hour or more to get back to a normal pedal. Of course if you have an actual mechancial problem inside the bellhousing with the pressure plate or disc then nothing you do on the outside will work until that is repaired.
7/2/2010 1:15:37 AM •
1989 GMC Sierra
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Answered
on Jul 02, 2010
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222 views
Push rod replacement?
Where did it go?? Just wore through? You have to get the lifter out of there and replace it with a new one, or a used one. For some reason, it is not getting oil. You might be finding more damage as you go. One of these days you are going to have to fix that engine right, new cam, lifters, etc. You can make a hook out of 1/4 inch rod, grind a flat spot in it with a small shelf left at the bottom for the hook, it will grab the edge of the lifter and pull it out. Hope this helps.
6/23/2010 8:49:05 PM •
1989 GMC Sierra
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Answered
on Jun 23, 2010
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83 views
Truck will turn over but not start. Checked fuel
The ignition module located inside of the distributor is what generates the signal that the ECM (Engine Control Module) uses to time and fire the fuel injectors, as well as the signal to run the fuel pump and the dwell signal timing to fire the ignition coil. A faulty ignition module can cause any one of these systems to malfunction.
That does sound like a malfunction with the ignition module inside of the distributor, and you can remove the ignition module and have it tested for free at most auto part stores.
If you do purchase a new ignition module be sure that it does come with a silicone grease or a die-electric compound because it is a heat sink and the ignition module will burn up without it.
To install the new ignition module first clean out the mounting surface inside of the distributor. Then completely coat the metal contact surface under the ignition module with a thick coat the silicone grease or die-electric compound and do not leave any of the metal contact surface of the ignition module un-coated with the silicone grease or die-electric compound, and be very careful not to over-tighten the ignition module or it will be damaged.
11/7/2013 8:10:57 PM •
1989 GMC Sierra
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Answered
on Nov 07, 2013
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714 views
1989 gmc sierra 6.2 liter diesel hard start when hot
hi, i have seen this problem ten years ago twice, but i was dumbfounded by the answer. all details aside, I replaced the ecm, and never had the problem again with both of them. this repair was a recommended repair by the local truck depot in my town, they stated the ecm got hot along with the truck and it lost the injector sensor signal. now, don't take this solution and run with it, i haven't repaired a 6.2 diesel in ten years and i maybe off track completely. but at least maybe you could ask around your town or maybe a large truck facility about this. of course, you should take to a shop to have diagnosed. hope i could help.
6/7/2010 1:46:13 AM •
1989 GMC Sierra
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Answered
on Jun 07, 2010
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539 views
I need to adjust my qcarb on 1985 gmc-pickup two
this truck doesnt have a carb, this has a throttle body, its fuel injected,there are no adjustments,every adjustment is done from the factory, the computer controls the idle,trying to raise the idle will throw the tps readings off,
4/22/2010 11:56:57 AM •
1989 GMC Sierra
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Answered
on Apr 22, 2010
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183 views
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