20 Most Recent 1991 Chevrolet K2500 Questions & Answers


Sounds like emissions component problem. The cat converter may be plugged.

1991 Chevrolet... | Answered on Oct 04, 2017


Go to napa or autozone and ask. I do know that the 73 - 89 axles take the exact Gear Oil that is put into the SM465 Bulldog 4 Speed Manual Transmission as well as the NP205 from 1973 GMC Super Custom 2500 4x4 rigs

1991 Chevrolet... | Answered on Apr 20, 2015


Most of these are a simple bolt with rubber bushings and spacers. With vehicle sitting on the ground and ebrake set, loosen the link bolts on both sides without completely removing them, then finish removing one and assemble new parts in the order you removed the old ones, being careful to put the rubber parts and metal washers together same as they were. Do other side same. Now tighten the bolts enough so that rubber bushings are compressed just enough to swell the rubber to the same size as the retaining washer and no more. DONE!

1991 Chevrolet... | Answered on Jan 12, 2015


Do you have a fuel pump that works & pressure at the engine?

1991 Chevrolet... | Answered on Nov 19, 2012


First I hope you have fixed the loose steering wheel the brake lights run through the steering colum and, so does alot of other componets.It sounds like you might have a bad ignition switch or a bad ignition key switch.

1991 Chevrolet... | Answered on Jul 08, 2012


pump is in the gas tank

1991 Chevrolet... | Answered on Jun 28, 2012


Common problem here.
If it cranks but won't start - check for spark at the plugs and coil, and for fuel spray at the injectors.
Also check the computer for trouble codes.

1991 Chevrolet... | Answered on Jun 28, 2012


On the full size, the front actuator is electric, not vacuum.

When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 1994 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME AND
COMPONENT RELIABILITY.

SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED
INTO 4X4.

Obtain the following GM part numbers:
(1) 26060073 Actuator
(1) 88959465 Harness/Spacer Kit

1991 Chevrolet... | Answered on Feb 02, 2012


need more info on fluid condition: smell, color, level

1991 Chevrolet... | Answered on Jun 14, 2011


when the engine starts the O2 sensor volts should be around .5 volts or 500mv so the 450mv is correct now i don't know wither your next statement is 115mv of 1150 mv it makes a big difference, so get back with me and i will see what i can do for you.

1991 Chevrolet... | Answered on May 06, 2011


It's not free but $24 will get you the original GM dealer wiring book at faxonautoliterature.com. I have used them before and had excellent service. Hope this helps.

1991 Chevrolet... | Answered on Mar 14, 2011

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