Top 20 1988 GMC S-15 - Page 3 Questions & Answers

on the 88 gmc the fuel pump is located in the gas tank

You dont state which engine
4 cyl 1-3-4-2
6 cyl (2.8l) 1-2-3-4-5-6 No 1 passenger(RH) side front
6 cyl (4.3l) 1-6-5-4-3-2 No 1 driver side(LH) front
Distributor rotation for all is clockwise (except 1.9l 4 cyl which is anti-clockwise)

On what size motor?

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black wires are normally ground wires.....if nothing has gone bad..then nothing is really wrong...but just to be safe get it checked by a local mechanic

You'll need a bench vice for this. A few sockets help as well. Once you get the shaft off the truck, put a smaller diameter socket on one side and a much larger diameter socket on the other and sandwich in a vice. Compress vice to drive the U-Joint through shaft (smaller socket will drive the one side through the other with the much larger socket). Installation is the reverse of removal.

start checking fuel pressure easier then changing pump re check that all is plugged in by air cleaner

check the bulbs

The firing order is almost always cast in the intake manifold in front of the throttle body.But here it is 1-6-5-4-3-2....Rotation is clockwise. The cosest front terminal on the cap is #1.

Follow any ignition wire back from the spark plugs; this will bring you to the distributor cap and once this is removed (clips or two screws), the rotor will be underneath and this just pulls straight up and off.

Fuel filter is either there or along the frame rail under the truck.You may also need to change the plugs,wires and oil.

You take off the differential cover in the middle of the rear end and theres a lock you slide out on both sides inside the rear end on the side walls each rear axel on both sides has one. Take them out and the axels will slide out.

helminc.com Complete service manual Not Cheap May try library or repair shop with a subscription to a tech hot line. They may let you see what they can call up on line. How about finding someone with the same veh and spend an hour fixing your issues the way they are on a good driving vehicle.

you will need a gear puller

fault code 23.Inlet air temperature sensor signal showed an air temperature below -22� F after the engine has been running for 5 minutes,,,,,code 23: MAT low temp indication, sets if the manifold air temperature sensor connections or wires are open for 3 seconds

that being said I'd start by unplugging the wires and make sure the connections are not corroded if so clean them and plug em back in if that does not work try the air charge sensor (the problem when mine had this code) with it acting normal after being shut off and restarted I would lean more toward a corroded or loose connection.

its in the box on the passenger side of the fire wall. remove the hoses and electric connections and remove the box youll see it n there

if i has started knocking you probably have shards throughout the engine, best bet is to buy a reconditioned short block , they even come with a guarantee if you have it professionally installed

Hello cman0906: My name is Roger and I will answer your question. The fire order is 1 5 6 4 3 2. See picture. Please rate the answer you recieved. This way we know your answer was correct. Should you need further halp please just ask. Thank You for using Fix Ya. Roger

check all fuses and relays,check coils.check to see if your rotor is turning under the dist. cap.If not your timing chain came off

you need an air impact gun to get retaining bolt out/off, then a pulley puller special tool to remove the pulley once the bolt is out, the pulley is pressed on.