20 Most Recent 1991 Chevrolet Silverado 2500 Questions & Answers

How about the MAP SENSOR? Do you check it out?

Code 43 is electronic spark control. ESC module is not receiving a knock signal from knock sensor. Check knock sensor/wiring, check ESC (parts store can check for you). That's what the book says to do. On my personal vehicle I got a code 43 and the problem was a bad oxygen sensor.

Underneath on tailpipe just before catylitic converter. Some models will have a second one between catylitic converter and muffler.

Three steps. Step one 25ftlbs. Step two 45ftlbs.step three 65ftlbs. This is for 1988-1995 5.0L and 5.7L engines.

check to see if your truck has a crankshaft position sensor, its usually located behind the harmonic balancer or right near there, if the sensor went bad or if the wiring got messed up there will be no signal to the ecm telling the ecm when to send spark to the coil. the crankshaft position sensor is responsible for telling the computer when to fire the spark plugs based on rpm and timing. check the wires on the crankshaft position sensor, if they look fine, replace the sensor, hope this helps!

Hello;
The fuse box is under the drivers side dah, on the firewall. Not sure about the cigarette adaptor but the fuses are marked as to what they go to. Hope this helps and please rate me;
Thanks
Rich
RPM Northwest

WELL YES YOU CAN PUT THEM ON BUT NEED TO REPLACE THEM WITH WIREING HARNESS AND COMPUTERS AND EXUST SISTEM THATS THE ONLY WAY THEN YOU WILL HAVE PROBLEM GETING IT TO SMOG UNLESS YOU TAKE TO STATE SMOG REFERY

It sounds as simple as water in the fuel. I would stick to the simple solutions first before throwing money at parts. Drain tank, use a good fuel additive and refill. See if that doesn't solve your issue.

for better result download the pdf file Best Manuals

Please refer to you question about the horn fuse for the answer.

The fuse for horn is the same as inside lights powerlocks and glove box light, the fuse is # 11, here is a diagram of the fuses.

Under neath the venting system behind console there is a venting housing that can be removed. Likely the air flow directional vent flap is stuck or the motor that moves the vent is faulty.

im thinking egr valve

Is it stanard or automatic The first think i would do is check the oil in eighter case.

you have no ground to your engine ; look for a large woven cable that should be attached to your engine block and reattach it

I had this happen and it turned out to be a bad fuel relay. Check that and also for loose ground wires at the battery, at the alternator and at the block.