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GMC suburban crank, no start, ALL EIGHT INJECTION CONNECTIONS ARE CONSTANT WHILE TRYING TO START.

1997 GMC suburban, DIED while at a light. No start since. No fuel pump sound so I replaced fuel pump and filter. Low pressure so I replaced the regulator and the spider. New rotor in distributor. Has spark, has fuel, has compression, went to a scrap yard and grabbed another ECM. STILL no start. Put old one back in. Now the only thing that's not working is the plug to the injection spider all 8 connections are constant while attempting to start. running out of money and I NEED this truck for work... Anybody have any clues?

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  • Mykel Jonez Apr 04, 2019

    Ok... We know it's a fuel issue. Starter flluid starts it.. replaced ALL starting related sensors, MAP, MAF, CRANK And CAM... Got a test light unplugged the injector harness stuck the test light in there and ALL 8 are on constantly when attempting to start. Where did this come from?

  • Mykel Jonez Apr 18, 2019

    Ok... Here's the latest news. Everything is good... Except the signal to the injectors. On side is constant other line... NOTHING.

  • Rocky Ram
    Rocky Ram Apr 21, 2019

    Do you still have the old ECM

  • Mykel Jonez May 22, 2019

    Ok... Got the updated injectors... Runs... But bogs down on acceleration...

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6 Answers

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  • Contributor
  • 7 Answers

Check your crank position sensor

Posted on Apr 18, 2019

  • Danny Chambers Apr 18, 2019

    Check your crank position sensor

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  • 1 Answer

Check smell fuse under hood marked ecm

Posted on Apr 13, 2019

  • Mykel Jonez Apr 18, 2019

    Fuse is good. One side injector line is constant. Other side is blank... Turn the key... Nothing. Just replaced cam sensor AGAIN.

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  • GMC Master
  • 1,188 Answers

2nd try.

  • Fuel pressure is good.
  • Test lamp show VCM is commanding injectors to open.

So your thought is the common side of the injectors are not powered. I believe this is the correct schematic for a '97 suburban.
There is the ECM1 fuse but hard to believe that fuse is blown, check it anyway.


GMC suburban crank, no start, ALL EIGHT INJECTION  - su1-lnke0sh3uzvbcs34yete0urq-5-2.png

Posted on Apr 05, 2019

  • 4 more comments 
  • Mykel Jonez Apr 18, 2019

    Common side is constant. When test light is clamped on posi. And push into injector connection it's on. Other side gets no signal. Fuses are good. ECM-B Is good. And the two IGNITION fuses are good.

  • Carl Rock
    Carl Rock Apr 18, 2019

    "Common side is constant" So you hooked test lamp clamp to batt negative and probed common leads at each injector and verified the common side of all injectors in fact light the test lamp. So injector fuse is good and injector power relay functions.

    Unfortunately I'm unable to reconcile switching test lamp clamp to batt positive and the non-common side is ON. The "other side no signal" should be the injector commons, so as expected since both sides of the test lamp would be batt voltage.

    The opposing injector leads should be off and pulse when crank. But you see the test lamp lit.

    Do I have this right or did I miss something as this doesn't make sense? The injectors would all energized

  • Mykel Jonez Apr 18, 2019

    Ok... My mistake. The test light was on the positive battery and I poked the injector connection and THAT was constant. So the pulse side is common? I assumed incorrect. But yes. One side is constant. Other side... Nothing.

  • Carl Rock
    Carl Rock Apr 18, 2019

    I believe your getting confused by which side the test lamp CLAMP is connected POS or NEG. When the clamp is connected to positive, the lamp will not light when you probe another positive, that being the common side of the injectors (see schematic above) AND it should be off when you probe an opposing injector until you crank engine. Testing this way (test lamp clamp POS) does require the injector to be plugged into the ECM.

  • Carl Rock
    Carl Rock Apr 18, 2019

    ... it should be off when you probe an opposing injector wire (not common) until you crank...

  • Carl Rock
    Carl Rock Apr 30, 2019

    MJ... you get this running?

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No offense but if you've tried everything you know, it sounds like it's time to go to a competent mechanic.

Posted on Apr 05, 2019

  • Don Skiver
    Don Skiver Apr 05, 2019

    No offense but if you've tried everything you know, it sounds like it's time to go to a competent mechanic.

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If you have low fuel pressure it has to be the pump. Wrong pump or the pump isn't getting proper voltage or a week ground. With that type of fuel system you will need a min of 56 psi. to open the Spyder popits.

Posted on Apr 04, 2019

  • Mykel Jonez Apr 04, 2019

    Pressure is good the injection pulse is constantly running while attempting to start .. not sure if that's supposed to happen or not

  • Rocky Ram
    Rocky Ram Apr 04, 2019

    Injector puls should be constantly when attempting to run...need to check for correct fuel pressure...

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  • GMC Master
  • 455 Answers

Have you checked for trouble codes? does it have a security light on?

Posted on Mar 25, 2019

  • 18 more comments 
  • Mykel Jonez Mar 25, 2019

    Never had a security light... Haven't been able to get it to any place to check the codes.

  • Rocky Ram
    Rocky Ram Mar 25, 2019

    so you have fuel pressure and spark?

  • Rocky Ram
    Rocky Ram Mar 25, 2019

    if you replace the ECM you will need to reset the vats

  • Mykel Jonez Mar 25, 2019

    Daaayyyuuummm... Forgot that. Never done that before. Chrysler just plug n go. It's my first time owning a suburban. How would I reset the vats?

  • Mykel Jonez Mar 25, 2019

    Pressure is good. Spark is regular.

  • Mykel Jonez Mar 25, 2019

    It cranks as if it's starving ..

  • Mykel Jonez Mar 25, 2019

    In this city... Hard to get a free diagnosis.

  • Rocky Ram
    Rocky Ram Mar 25, 2019

    HAVE YOU TRY SOME STARTER FLUID JUST TO SEE IF IT STARTS?

  • Rocky Ram
    Rocky Ram Mar 25, 2019

    WHEN WAS THE LAST TIME YOU REPLACE DISTRIBUTOR CAP AND ROTOR?

  • Mykel Jonez Mar 25, 2019

    Starter fluid only runs it as long as I spraying. Bought new rotor two days ago.

  • Rocky Ram
    Rocky Ram Mar 25, 2019

    If it runs with starter fluid you have a fuel problem...

  • Mykel Jonez Mar 25, 2019

    I knew that. I'm just confused on WHERE.

  • Rocky Ram
    Rocky Ram Mar 25, 2019

    Do you hear the fuel pump turn on when you turn the key to the run position...have you check the fuel pump relay?

  • Mykel Jonez Apr 04, 2019

    P0107 manifold absolute pressure,.. low (?)

  • Rocky Ram
    Rocky Ram Apr 04, 2019

    https://www.obd-codes.com/p0107

  • Rocky Ram
    Rocky Ram Apr 04, 2019

    Truck still not starting?

  • Mykel Jonez Apr 04, 2019

    Only code was p0107...

  • Mykel Jonez Apr 04, 2019

    Still... Injection pulse is constantly goin when attempting to start.

  • Rocky Ram
    Rocky Ram Apr 06, 2019

    the only thing that could disables the fuel system is the security system

  • Rocky Ram
    Rocky Ram Apr 13, 2019

    Did you ever get the truck running?

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Posted on Jan 02, 2017

  • 92 Answers

SOURCE: 1997 F-350 Ford Powerstroke4x4 Crew

Have you changed your oil? Rotella 15W-40. These engines really don't like old oil. It becomes too thick for the injection pump to work correctly. Another possibility is a bad cam sensor on the front of the motor. Most engines call this the crank sensor but on this engine you have to look it up as a cam sensor.

Posted on Sep 29, 2009

SOURCE: 1997 GMC Sierra 5.7 Vortec, replaced the fuel

10psi is, as I'm sure you know, about 48psi short of what you need to get it running. Did you verify you're getting a full 12 volts at the fuel pump connector? Check the ground wire also, ohm it out to chassis ground, shouldn't be more then a few ohms. Verify it's making a good connection and the terminals are clean and tight. High resistance in the wiring or a connector in the circuit could cause the fuel pump to not output the right amount of pressure.
Did you replace the fuel pump with an aftermarket unit or an oem part?

Posted on Nov 01, 2009

B-Roosky
  • 59 Answers

SOURCE: i am not getting power to my fuel pump

on a lot of ford products there is a switch that goes from the fuel pump to the inside of one of the bedsides.
what this is, is a shock switch that turns the fuel pump off if it absorbs a hit.
its a really dumb safety feature but its effective.
there is a red button on it that u have to press to make it active again.
sometimes they just trip for no reason.

Posted on Jan 11, 2010

  • 53745 Answers

SOURCE: Have 2004 trailblazer died driving down road.

run the fault codes and check for broken timing belt( cam shaft not turning)

Posted on Oct 23, 2014

  • 34 Answers

SOURCE: 1997 Jetta GT 2.0 Stopped running,cranks,will not start

Hi these models are notorious for crank sensors Situated front of engine near engine oil filter. Before they fail completely the engine will shut down as soon as your engine reaches operating temperature note. The crank sensor does not throw a code half the time. Even without check engine crank sensor is possible. To confirm it's not a fuel issue open flexible air intake pipe which leads to m.a.f. Sensor. ( mass air flow ). On the engine side spray a few seconds of air intake cleaner and crank the engine over if it runs a few seconds. Fuel issue.
Air intake cleaner spray can available auto parts store. Hope it helps some for diagnostic purposes.

Posted on Jan 02, 2018

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