20 Most Recent 1990 Chevrolet C1500 Questions & Answers


indicates injectors ( dirty /blocked tips, low fuel pressure--up to 65 psi-injector wiring and harness , ECM problem
run the fault codes with a scanner that has GM protocol installed

1990 Chevrolet... | Answered on Jul 09, 2017


I recommend you check the fuel pressure regulator diaphragm for proper installation and tears. Did you get a new one with your rebuild kit?

1990 Chevrolet... | Answered on Jul 01, 2017


You first need to check the fuel pressure, an easy way to access this is to buy a can of spray starting fluid, spray it into the TBI throttle valve and if the truck starts and dies you have no fuel pressure. Replace the fuel; pump, and make sure you get the right pump, it is a low pressure system.

1990 Chevrolet... | Answered on May 19, 2017


Possible out of adjustment, bad proportioning valve, bad springs on brake shoes, shoes out of alignment, leaking wheel cylinder. Good luck

1990 Chevrolet... | Answered on Apr 11, 2017


Hi Laura, One of the easiest ways to get wiring diagrams is to go to Autozone website and sign up as a Do It Yourselfer, Autozone owns Alldata. They are one of the largest companies that provide Wiring diagrams,etc, for pretty much everything on the road and it's free. Hope this helps, Good Luck, Randy.

I’m happy to assist further over the phone at https://www.6ya.com/expert/randall_d932ef6e01588b0f

1990 Chevrolet... | Answered on May 02, 2016


oil pressure switch normally located close to the oil filter or around the oil pan and lower engine block where the oil is stored

1990 Chevrolet... | Answered on Apr 07, 2016


6cyl or 8cyl? Have you verified the rotor is turning inside the dist.?

1990 Chevrolet... | Answered on Jul 12, 2015


Check the ground at the coil. If ground is good. check for ground at the distributor module. If both are good, you have bought a bad part. Both can be checked.

1990 Chevrolet... | Answered on Jul 12, 2015


I would take it to a good mechanic and have him check to see if it needs a tune up or if it has jumpt time. Sometimes the timming chain will stretch if the engene has a lot of miles on it.

1990 Chevrolet... | Answered on Jun 03, 2015


Normally there are bolts on the latch and in the pins on the tailgate itself. You might have to adjust all 4 of them in order to make the rattling stop

1990 Chevrolet... | Answered on May 12, 2015


YOU NEED TO TEST FOR SPARK, IF NO-SPARK SUSPECT IGNITION MODULE, THIS IS A COMMON PROBLEM WITH THIS TRUCK.

1990 Chevrolet... | Answered on Apr 28, 2015

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