20 Most Recent 1993 GMC Sierra C2500 Questions & Answers

here you go http://www.wellsve.com/custom_searches/pdf/firing_order/Chevrolet_truck_30.pdf

if you have fuel and power to the injectors then you need to check the ground circuit of the injectors. this is controlled by the computer. it could be plugged up injectors as well.

4.3 (VIN W AND Z) ENGINES= 1-6-5-4-3-2 --DISTRIBUTOR ROTATION: CLOCKWISE

5.0 (VIN H AND M), 5.7 (VIN K AND R), 7.4 (VIN N AND J) ENGINES
1-8-4-3-6-5-7-2 ---DISTRIBUTOR ROTATION: CLOCKWISE

Welcome,

Need the engine size please?, Lee

Check for bad grounds, back by the tail lights , the grounds should br going to the frame

first, check your brake fluid level and color. if it ain't transparent in the master, your fluid is contaminated, you will need to flush it. second, check all wheels for seized/broken calipers and/or wheel cylinders.
third, check all brake pads/shoes for thicknest, disk/drums for problem like out of round, they can be resuface or replaced.

Hello jw..... The dash is a bit tedious to remove but it is certainly doable. Here is a step by step with photos that may be just what you need to proceed: http://www.dieselplace.com/forum/showthread.php?p=3972099

Joe

Thanks for choosing Fixya!

probably the instrument cluster unit,but check fuses first.












TIM...

check fuses

sounds like a modulator problem,make sure you have vaccume going to the modulator on the tranny, start the truck leave it in park pull of the vaccume line at the tranny , if its got fluid in it then its bad, and make sure you have vaccume too it!!!!

It should be somewhere between 12 and 14 volts. The more options, like lights,A/C, brake lights ect. that you turn on the reading will change. But it should stay between 12-14 volts.
I hope this helps .

possibly fuel filter or pump

check fuel pressure if less then 55 p.s.i change fuel pump and fuel pressure regulator

Hard to say, it could be a dirty injector to and bad fuel pressure relay or the vacuume line to the fuel pressure relay. After that you could change the fuel filter, it may be dirty and causeing your pump pressure to drop when on demand. good luck and hope this helps