20 Most Recent 1985 GMC K1500 Questions & Answers

possiable brake booster. if you hear a hissing sound and truck runs rough if not possiable master cylinder.

solenoid dead?

I'm not sure which one you are talking about, if I remember correctly there are 2 on the firewall. One is a 16 guage wire which protects all red 12 guage wiring. The other is a 20 guage wire that protects the generator warning light and the field circuitry on the alternator. It will be protecting a 16 guage wire.

the ticking noise your hearing is the mixture control solenoid from your carb and its perfectly normal. It should go for 25 seconds when key is on and engine not running. When engine is running you should hear it all the time. If you dont hear it when engine is running then you have a problem

have you checked the head light switch

The filter for a truck TBI would be under the floor between the gas tank and the engine. Its attached to the frame.

check the following items:

1. are you still running on carburetor? if yes, have your carb cleaned first
2. are your water/coolant levels in radiator and coolant reservoir full? if no, have your radiator overhauled.
3. is your water pump working? you can check it by doing the ff:. when your engine is cold, remove your radiator cap. start the engine and let it run for a few minutes until it gets hot. then check if water in radiator has a swirling effect.
4. check your oil level. you can check it by looking at your dip stick

Rear ground wire is rusty or dirty or fuse is blown front and rear lights are on a separate circuit and fuse.

I have done this. You might have crossed the fuel lines. Check them. I know its a pain in the **** but it;'s worth checking apparently you forgot or overlooked something or crossed lines.

Possible that the main processor controller is faulty and unless the main microprocessor works none of the fucntions will be in control/
So if you are able to check the processor oscillations, check and confirm. make sure the +B

they unlock the gearshift

At a certain point in a truck/car's life, the gas that is in the shocks, or the fluid, starts to degrade, or seep away, at which point it is horrendously ineffective at cushioning out those potholes before they reach your rump. It sounds like shock replacement time.

Yes it does have a switching valve.

Slow is the same speed as 'mist'. Mist is when you twist the control arm backwards to induce a single swipe. If you hold it, you will run the wipers in low speed. Fast is faster than that. Probably by 30% or more.

Turn the wipers on high speed. Wiggle the connector at the wiper motor. If the wipers run sporadically as you wiggle the connector, you either have a bad connector or a bad circuit board on the wiper motor.

You can always visit your local library and check out a Chiltons ect. :-)

Check the fuseable links .. they are a rubbery type wire usually on the back of the alternator or starter motor usually in a group with 3 to 6 of them ..They usually have a black or white piece of plastic where the fuse link attaches to the actual wire .. These wires aka fuseable links usually corrode or rot out at the plastic piece under the insulation you hardly see the break in the wire...good luck..by the way.. these links act as a slow blow fuse in the system...

Adjust choke flap and or choke pull off.

The only fuse for the headlights is in the headlight/headlamp switch which is a circuit breaker which should automatically reset itself when in off position.