Top 20
1988 GMC S-15 Questions & Answers
1988 s-15 4.3 v-6 tbi My truck makes the idle air
sounding like a cracked or broken vacuum line, could also be the adjuster screw has a build up on it as well, on the stopper. but sounds like a vacuum leak.could be on the lines or on a diaphragm moving part. you would need to use a leak tester.
2/27/2018 3:06:03 AM •
1988 GMC S-15
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55 views • 0 helpful votes
The right front axel keeps
hey there my best bet solution would be to remove the c clip and wrap some wire round it a few times to solve the problem..
12/5/2017 11:57:03 PM •
1988 GMC S-15
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38 views • 0 helpful votes
Dumping too much fuel while running
Clearly some fancy diagnosis and testing is needed and checking the fuel pressure will be part of those checks as would testing the injector spray patterns.
If the injectors are producing droplets that are large or are dribbling or leaking the oxygen sensor will see the result as a lean mixture and increase the injector duty cycle making the situation intolerable at idle when the intake air speed is too low to break up large fuel droplets.
Just an idea...
9/16/2017 12:48:03 AM •
1988 GMC S-15
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245 views • 0 helpful votes
Why do my turn signals work correctly oin front but both flashes in rear on 1988 gmc s15
Trace the wiring harness at the rear to see if its rubbed through anywhere. Check all plugs are fully home and plugs pins are in good condition, not corroded or wet. Next check the ground leads on both rear lights to see if its an earth fault sending current to both bulbs. Next, remove one bulb and see if the other functions normally. Then try other way round. See if that shows up any fault.
Also, if you have a trailer socket, check that for cross connection etc.
5/24/2014 7:05:27 PM •
1988 GMC S-15
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54 views • 0 helpful votes
What causes turn signal to work correctly in front but both flash in back
Short in wire.. look under the rear of the truck.. find the tail light harness.. take your volt meter and see if it is flashing there.. if not than the short is in the harness running up to the rear lights.. If it is flashing there trace forward.. could be anywhere between that connection and the flasher.. Post a comment and let us know what you find..
5/24/2014 7:01:10 PM •
1988 GMC S-15
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42 views • 0 helpful votes
88 gmc s15 wont stay running after it is warm
Did you check the fuel pressure before you replaced the pump ?Can you spray carb cleaner or starting fluid into the throttle body and make the engine want to start ?If it is throttle body injected, can you see the fuel spray when you crank it hot ?
1/23/2013 8:16:29 PM •
1988 GMC S-15
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345 views • 0 helpful votes
1988 s-15 will only start and run, when driver side jacked up about 10 inches
I suspect that you have some sort of immobiliser connected to the seat belt system and that area has moved and not allowing the circuit to be made for starting. A sort of can't start the car unless the seat belt has been applied. Try clipping up the drivers seat belt for starters or check if there is such a requirement in the car.
3/21/2013 5:36:31 AM •
1988 GMC S-15
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48 views • 0 helpful votes
No peddel
keep bleeding the system,if u didnt bench bleed the master cylinder,you will need to do that.Its a must
11/23/2012 8:14:37 PM •
1988 GMC S-15
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624 views • 0 helpful votes
ECM fuse keeps popping and fuel system don't work
There should be two ECM fuses. Number one powers the injectors and some of the solenoids along with the ECM. Number two or B powers the fuel pump relay and the rest of the ECM including the sensors that provide data to the ECM. Both are 10amp circuits.You may need to get a shop manual to have the wiring diagrams to troubleshoot the circuits.
9/20/2012 1:15:59 AM •
1988 GMC S-15
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478 views • 0 helpful votes
How do you change the oil pump on a GMC S15
First off I'd thoughly clean underneath with maybe brake of grease cleaner. after dried, place a long piece of cardboard underneath to positively determine where the leak is. leaks do travel and can mislead you to the location of the problem
6/9/2012 2:22:16 PM •
1988 GMC S-15
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259 views • 0 helpful votes
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