20 Most Recent 1986 GMC K1500 - Page 4 Questions & Answers

Fuel pressure reading will give you the answer.but O2 sensor,engine temp,trottle position sensor,poor combustion like cylinder compression spark plugs, valve timing As you can see there a lot of things that can change the rich and poor fuel metering. hope it helps

If you are talking about the brake pedal being stiff and too hard to push, then working easily again - it sounds like you temporarily lost the power assist. This will happen again and it is not safe to drive until properly repaired. Many decades ago cars had no power assist and took much more foot pressure and much longer distance to stop. So your brakes were working, just not the assist. The power assist is provided by a vacuum line from the engine. The likely causes of the failure are: stalling or stopped engine, leak in hose from engine to brake assist booster or leak in the diaphragm inside the brake booster. There are also other much less likely causes from brake fluid lines and the master cylinder. Regardless, don't drive knowing the brakes are likely to fail.

If It has fuel injection it can be the fuel pressure valve, that hold the fuel pressure on the reel with the injectors. you can check it bi clamping the fuel return line so it can not flow (to see if the fuel is just going around back to the tank with out making pressure), and se if it can run but it is just to check it out, the valve can be stuck after the fuel filter was full and pass some dirt thru the system. but i don't know this type of car, just passing some ideas

remove the blower motor to get it out.

how many miles? timing chain? distributor? more than likely timing chain..

Have you tried cleaning the battery terminals? I know it sounds crazy but it cold be the problem.

CHECK THE PRINT CIRCIUT BOARD IN TAILLIGHT ASSMBLY ,POSSIBLE TURN SIGNAL SWITCH ASSEMBLY

Fully charged- but maybe air in itor no flow thru orificeCycles because of pressure differencesin the systemFind out why

Since spark, gas and air are the basis for an engine running...check for a good, clean spark going to each cylinder, Check the choke for a jammed preheater coil that is not setting the choke properly.

There is one test I suggest you have run, it is called a fuel pressure leak down test. If the fuel pump pressure check valve fails to hold fuel pressure it causes hard starting. Any shop can run this test.

there is a in line fuel filter under the truck between the tank end motor. try replacing it first.its about 10 dollars. if thats not it, take the fuel line loose, before it goes into the filter and let it hang down freely, try starting the truck with the line off. if no fuel comes out of the line, the fuel pump is not working. this can be a bad pump, wiring problem or fuse. let me know, i will try to help. [email protected]

I would strongly recommend you download an instruction sheet from the company website which is msdPerformance.com.The basic answer is the pink wire from the key is connected to the B+ terminal on the coil.

if the starter is making a grinding noise when you turn the key, it's one of several possiblites. 1. Bad Starter. 2. Bad flywheel. 3. You need starter shims that fit between the starter and the motor. Most starters will bolt straight up but sometimes the gears get too close so you need to shim them apart.