Question about 1988 Chevrolet K1500
Installed new pump relay and checked all wiring as well as changed the two tbi injectors
The pump circuit and the injector circuit are separate circuits and not related. Guess you had better get the fuel pump working first. Did you check the fuse? Can you feel the pump relay click when key is turned to on? Have you checked for a power feed to the relay with key on? You may need to pull the tank connector apart and check if the pump wire has power on it when the engine is being cranked. If you have power there, then likely the pump needs replaced.
The injector circuit will also be on a fused circuit,. so check the injector fuse. The injectors should have a steady voltage on the power wire when key is on. If not, check fuse and check wiring. The other wire on the injector connector is the ground wire going into the computer. To check the injector ground, clip a test light lead to the positive battery post, and the light's probe into the ground terminal for the injector. Now have the engine cranked over watching the test light: if the ground circuit is working right, the test light will be blinking. If no light, check the ground wires going to the computer.
Posted on Apr 11, 2013
The fuel pump circuit and injector circuits are fed by two different fuses.
The fuel pump relay and injectors are controlled by the computer. Have you checked both ECM fuses for power ?
Posted on Apr 11, 2013
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Posted on Jan 02, 2017
There needs to be 60 PSI of fuel pressure in the system to have the fuel injectors to work. There is also a fuel pump relay on the fire wall just left to the brake booster, There is two relays there, i just can not remember which relay is which but try switching the relays with one another. Also check the fuses to the fuel pump and ECM, and the fuel pressure from the shredder valve. Good luck and keep me posted, not a bad Idea to also replace the fuel filter, and that is located at the inside frame rail under the drivers side.
Posted on Jun 03, 2009
Check out your oil sending unit, fuel pump and relay, check for power (might be a fuse), the ignition control module (which if you remove it, can be tested for free at AUTO-ZONE), any related wiring, pick-up coil (inside the distributor), and possibly the ignition switch. If I can be any more help just as away.
Posted on Jun 06, 2009
I can't speak for the electronics in your Chevy Sub. however I had experienced this same problem on my Montero and on my son's Dodge Stealth (it too is a Mitsubishi) in both cases I had spark but no injector pulse. In the end both ended up being the engine ECU units, once changed they ran and are running fine. Any chance you know someone with the same truck? If so confirm the part number and swap in their ECU unit. If your car then runs you know the answer. Good luck!
Posted on Aug 16, 2009
my injectors have no power ging to them. i just replaced fuel pump and relay. i have fuel going to my 350 tbi but nothing coming out the injectors. it wont start and i have no power at the injector so i dont know if its the ecm or what
Posted on Dec 20, 2009
try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch you can't see between the engine and fire wall just behind the distributor and costs 8 bucks to buy new.
Posted on Jan 16, 2010
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