Question about 1992 GMC Jimmy

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I have a 1992 GMC Jimmy Blazer 4x4, W engine code (Spider Injectors). ECMB Fuse blew out, replaced fuses and blew again. Took out the Fuel Pump and bought a brand new one. Fuse stopped blowing and fuel pump kicks on just fine, however the Injector isn't actuating. I used to be able to hear the injectors priming the cylinders when I turned the key into the on position. I then replaced the whole fuel line and fuel filter. While the upper plenum was off I checked over the Spider injector and nothing seems out of place and no evidence of a leak. With all that in place I am getting fuel up to the fuel rails. i.e. Depress the valve on the back drivers side of engine and gasoline gushes out. I then was thinking maybe the ECM wasn't sending signal for the Injectors to actuate, so I took the blue electrical line directly from the injector. cut it and spliced a longer electrical cord to ground it out directly and bypass the ECM. They still don't actuate. took an ohm meter and checked, the injector is getting 10.99 volts to it. I am stumped and kind of frusterated.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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frostwireguy
  • 46 Answers

SOURCE: 1995 gmc Jimmy

maybe bad ignition module or coil.. when they get hot sometimes they wanna die...

Posted on Sep 17, 2008

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  • 291 Answers

SOURCE: 1991 GMC Sierra loses fuel pressure after it reaches the TBI

THE INJECTORS ARE PULSED TO GROUND DIRECTLY BY THE ECM...... MAIN COMPUTER... IT COULD BE FLAKY BUT I HAVE FOUND MANY TIMES THAT THE HALL EFFECT SENSOR LOCATED IN THE TOP OF THE DISTRIBITOR GETS INTERMITTANT.... THIS CAUSES LOSS OF SIGNAL TO ECM INTURN LOSS OF SIGNAL OUT OF ECM TO INJECTORS... LET ME KNOW

Posted on Sep 01, 2009

  • 221 Answers

SOURCE: i have a 1995 gmc jimmy 4x4 i check fuel pressure an the voltage

This post doesnt make sense. WHat tests have you run and what results do you have?
Fuel pressure on a vortec must be a stable 60psi. You need crank sensor at the pcm, spark, injector pulse AND flow thru the poppet system. You title description is of no use in diagnostics.
12v at the spider just means it doesnt have a blown injector fuse and the ignition works. The other 2000 of so things that could cause a no start arent answered in that info.

Posted on Sep 15, 2009

SOURCE: Bad idle on my 1995 GMC Jimmy. 4.3 Vortec CPI

Unfortunetly....these spider injectors and fuel pumps can have very similar symptoms when failing. What I do know is I work on this motor more than any other motor in my shop. Very common with fuel problems...and I can comfortably tell you that they updated the injector kits on these car for a reason. The original model is junk. I have done these on just about every one of my cutomers vehicles over 150,000 miles. However, I am not going to tell you that is your problem....but it sounds fuel related. Did/does your vehicle skip? Leaking injectors will usually cause a skip due to shortage of fuel to that cylinder. I also have a computer that allows me to monitor the firing of each cylinder, and do an injector kill test. This is what I would do first. Unfortunetly, sounds like you can't so start with this: Clean your throttle body. The pintle that the IAC motor pushes in and out goes into a small port. Spray that port out with carb clean. Get a fine wire brush and get that throttle body clean and shinny. That pintle can easily stick on existing carbon in that port...new part or not. Check for vacuum leaking with carb clean...spray it around the intake and vacuum hoses...see if any particular spot changes how it runs when you spray it. Do you have a vacuum gauge? what is manifold vacuum? Since you are in the intake...make sure your puddled fuel is not due to pulling the main lines off the the injector assembly. After intake is off. hook fuel lines and harnes back up to injector assembly. key up (no start) vehicle...this pressurizes fuel system. look for leaking. The fuel pressure regulator is built on to the side of that assembly....its the round diaphragm with the tube coming out of it. If it leaks fuel out...that may be your problem. And you can replace that without doing the whole injector kit...fairly cheap. If not fixed....what is your fuel pressure. You need to have 60-64 PSI at key up. Try the carbon build up and intake test first...both quick, easy, and cheap. If this is not your issues...its sounds fuel related....just want to confirm that you don have a misfire/skip. That could change diagnosis quite a bit. Keep me posted....more than happy to help. By the way....I own all GM's too...lol...haven't learned my lesson yet

Posted on Nov 14, 2010

  • 90 Answers

SOURCE: i have a 1989 gmc

make sure you have spark

Posted on Feb 27, 2011

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1 Answer

I have a 1992 Chevy S10 Blazer Vin code W. I have fuel to the purge valve, is there anyway to flush the spider? It runs if u put gas in the snorkle till the gas runs out.


Purge valve? That is part of the emission system! Nothing to do with injectors. If the injectors are not supplying fuel and the fuel pump/pressure is good, look for a bad fuse. Does the check engine light illuminate during a bulb check? Check power and ground supply to injector harness plug. If no check engine light during bulb check, suspect a fuse/power supply issue

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What I've seen done to test an injector is to pull it, and swap it for another cylinder. If the miss moves, then the injector is bad. If the miss stays on #5, then the problem isn't the injector.

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If the windshield is still leaking use a water hose and run it over the outside till you find the leak, and seal it with windshield adhesive. Moisture is bad for the fuse box. You may want to pull the fusebox out and inspect for damage behind it-melted or burnt wires, terminals, or connectors.
Sounds like you're on top of it. Just stop the leaking and clean up any damage and you should have it. Good luck.

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Have you fuel pump checked, as this could be a possible cause.

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Hi, the ECM B fuse powers the ECM and the fuel pump. It's hard to say where the ECM power is used, since it appears as a black box in the schematic. The fuse box or owner's manual may indicate circuits that the fuse powers thru the ECM. If you find you need additional diagrams, please let me know and please specify if you have the VIN W (central point injection) or the VIN Z (throttle body injection) engine.

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1 Answer

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If fuse is blowing you probaley have a short in the wire get a wiring diagram locate stress point in wire first such as door jams check for resistance in the wire if none there is a short somewhere

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2 Answers

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Hi

A very common failure on these is the CPFI unit , or SPIDER as people like to call it.

There is one single injector which feeds each cylinder via a pipe and poppet. The injector becomes blocked and the engine won't start or run.

Before you go condemning this though, just make sure you have good fuel pressure because the fuel pressure regulator or fuel pump could also have a hand in the problem. Make sure the pump is running, and if not then check the fuse, the relay, and the pump itself.

Very best regards

Geordie

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