20 Most Recent 1987 GMC S-15 Pickup Questions & Answers

if it has MAF & TPS sensors then clean with right cleaners and check air filter your computer is resetting itself

• You should have two of them (which went to one in think 1991 or 1992)

• The sensor by the distributor is for the oil pressure gauge - see pic below.

• The sensor by the oil filter worked with the fuel pump power circuit see - pic below.

• If you have any comments please feel free to leave them here.
• Hope this helps and thank you for using FixYa.

Regards, Tony

check the fuel pressure this year truck known for bad fuel pumps especially after 80k

These two diagrams are for Chevrolet engines Small block v-8 and 4.3 v-6 Chrysler 2.5 4 cylinder has coils only so 1-4 and 2-3 are the paired units

To replace the ignition switch remove the horn pad be careful the wire is still attached to the turn signal switch the plastic piece push down and turn it comes out then remove snap ring on the end off the steering wheel then nut place a dot of finger nail polish on the shaft and wheel for alignment purposes use a steering wheel puller once off then install a lock plate puller compress down and remove lock ring once removed (lock plate) this is spline d to go on one way then take the cancel cam off (slides off) remove turn signal lever screw and turn signal screws lift up to gain access to the ignition switch retaining bolt a small piece of plastic is covering the screw that is the key buzzer switch it just pulls out be careful not to drop the spring steel retainer down the column it does not come out that easy and does not install that easy either. Place ignition in the on position remove and put the new one in the same way this allows the key buzzer to go in with out interference from the plastic shoe that's part of the switch. the lock plate tool can be rented from the parts store.

easiest , is to pull the steering wheel... there is a screw / clip that holds the lock bracket in place........ i've seen a few lock specialist do it with out taking the st. wheel off... but $$$$$$'s ..

look directly under the switch where the key goes in. there should be a small hole. Insert the key into the ignition then find a pin or a small tool that will fit into the hole. press it inward and this will release the lock that holds the keyswitch in.

you need to back bleed the system.
snapon and parts stores sell a bleeder but for many year i have use just a simple pump oil can and a hose to connect to your bleeder fill your oil can with brake fluid and with the cover off you master. now just pump fluid up therw your master .

Use the yellow bottle of HEET dry gas to rule out water in fuel. Clean/replace air filter. Clean the air filter housing

u have a blown head gasket

is it over drive control wire plug in...? Mai

Firing Order: 1-5-3-6-2-4