Question about GMC Cars & Trucks
Fuel pump problems
Posted on Dec 21, 2016
I'm a little confused when you say "it doesn't crank" do you mean it cranks but won't start? If so check you ignition system... spark plug wires, distributor, or relay for spark. If that is sparking then it's a fuel problem. Check your carb or fuel injector whichever applies. Being a older vehicle fuel pump could be the culprit.
Posted on Dec 21, 2016
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Posted on Jan 02, 2017
SOURCE: 1998 GMC SIErra
Check your transmission. Look underneath the truck and see if you see moisture around the transmission pan. If you see any indication of that, you may have a huge issue on your hands. Your reverse gear is seized to the Drive Gear. However hopefully it's something like needing a new clutch or a clutch adjustment
Posted on Aug 23, 2009
SOURCE: firing order for a 1986 gmc s15
To avoid confusion, ALWAYS replace spark plug wires one at a time.
The most important thing to remember about the removal and installation of a distributor, cap or spark plug cable is that all wires MUST be labelled before they are disconnected. Keep in mind that these figures depict a firing order where the distributor cap terminals are relative to EACH OTHER only and they do not necessarily depict the tower positions in relation to the rest of the engine. This is true because any distributor which has been removed and reinstalled may have been installed with the No. 1 spark plug tower at any position (360 degrees) in relation to the rest of the motor, as long as the rotor aligned to the No. 1 tower when the No. 1 cylinder was at TDC of the compression stroke (valves closed, ready for the plug to fire). As long as the remaining wires were connected in the correct firing order sequence (depending on direction of distributor rotation) the engine will run. DO NOT EVER remove more than one wire from the distributor cap at a time unless you tag ALL wires and towers to assure proper installation.
Fig. 1: 1.9L engine . Firing order: 1-3-4-2 . Distributor rotation: counterclockwise
Fig. 2: 2.0L engine . Firing order: 1-3-4-2 . Distributor rotation: clockwise
Fig. 3: 2.5L engine . Firing order: 1-3-4-2 . Distributor rotation: clockwise
Fig. 4: 2.8L engine . Firing order: 1-2-3-4-5-6 . Distributor rotation: clockwise
Fig. 5: 4.3L engine. Firing order: 1-6-5-4-3-2 . Distributor rotation: clockwise
I hope help you with this (remember rated this help) Good luck.
Posted on Oct 05, 2009
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