20 Most Recent 1988 GMC K2500 Questions & Answers

Hello. It seems your truck has either an excessive vacuum leak and/or restricted exhaust problem; this causes rough idle and/or surge conditions. Keep me informed; if you want to.

Not sure that we are thinking of the same thing. The wires to the gas tank operate the fuel pump and the fuel gauge. The relay is used to send power to the pump and you should not have to do anything to it to get power down the wire to the pump. When you turn on the key, the relay closes and power goes to the in tank fuel pump.

connect up the vacuum hose to the distributor . Check point gap for the miss. Use a timing light to check if the distributor shaft bushes are worn. The timing will wander if it is. Check the condenser and the coil .Check the distributor cap for cracks or carbon marks and that there is a carbon pin under the coil lead inside the cap

youre alt is internaly regulated so with it being new and youre battery is new follow youre wiers from youre alt to youre firewall making sure you dont have any bare wiers cuasing the system to have a week short and make sure all of youre conections from youre battery to youre starter and the alternator are cleane!

i was at stop sign i move little bit my truck stop moving and truck was running.. i try to put it in drive wont move i also tryed other gears wont move at all. any one help me out?

when you replaced it with the used one, was the check valve removed at anytime, if so that would be the problem, the check valve holds the manufacturer pressurized vacuuum. but first re-bleed all four wheels, quite simply you may just have air in the lines

Check for proper Ground to fuel pump circuit. Start at fuel pump, work your way back through wiring, to the relay.

You will need to ask the dealer parts dept this question, we have no way to reference this here at fixya.

Some thing in the instrument panel has shorted out or the wire from the fuse to the panel., pulling to many amps. If you could do without the panel for two days you would find out if it's the panel or the wires before. Electrical problems are no fun. I'm into a Ford that I just got running (second day) And there are still problems. (stupid computers). For the wires a good place to start is behind the fuse panel

1988 K2500 hundred was once plaque by the whole distributor reluctor itself this is the one where you florr it and it backfire through the intake, so you have to take out the disributor as a whole and replace it mind you mark the direction the rotor point to before you pull it out so it will be easy to put on again, you will need a timing light to set it correctly

It wiil bolt together yes,do you mean an old 70s era 327?

That would be coolant from the radiator
trans cooler

Now you have to rebuild it again

feel under the water pump right after you shut the truck off. if it is leaking still, you probably need a new water pump.

Check all of the sensor wires. Sometimes if they are bad or not hooked up the computer wont let it start.