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1991 GMC C1500 Questions & Answers
Both rear turn signal lights flash
Why don't you just cut 2 wires where you know they're good, add 2 new wires, and run them to the back, and by-pass whatever the problem area is, and your done?
700r4 transmisson vibration in 1st and 2nd gears
this is probably a bad u-joint(s) crawl under the truck engine off and in park and on a flat spot, twist the drive shaft if it clunks at all or has some up down or left right slop the joints are shot and will need replacing. And yes the u-joints will cause a drive line vibration that seems like a transmission issue it goes away with speed as the shaft will spin fast enough the vibration will become only a hum.
91 GMC Siera 4x4 1500 automatic transmission slipping
Yes the trans can wipe out the crank bearings or the spacer behind the crank(forget what its called) it can let the flexplate move and the bolts can hit.That may be what your hearing. Does it still have good oil pressure?
1991 c1500 will not crank or start battery and starter good
Possible faulty park/neutral switch. Hold key in start, while moving gearshift up and down. Be sure to have a foot on the brakes! If it starts, or tries to, the switch is bad or out of adjustment. Possible bad ground too. Follow the negative cable from the battery to where it connects to the frame or engine, undo the bolt and clean it well with a wire brush.
Po42 and po43 on my gmc 1991 1500
That means both bank one and bank two oxygen sensors are reporting the same signal IN FRONT OF and BEHIND the catalytic converter. This could be from the catalytic converter failing or it could be from a manifold leak, wiring problem etc.
How to get number 1 cylinder top dead center when motor is not running on a gmc 4.3 1991
With truck off, you can turn the crankshaft nut from bottom of engine. To bring to top dead center. Remove #1 plug and insert a straw or similar into plug hole on top of piston. When the piston just starts to go back down from all the way up, that's top dead center, The number one cylinder in the 4.3 V-6 is the front wire on the driver-side of the engine. God-Bless!
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