Question about 1999 GMC Suburban

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99GMC Suburban turns over but won't start

Friday my truck started fine(some rain). Saturday it sat(lots of heavy wind and rain, in an open parking lot). By Sunday morning it turned over, just wouldn't start. Connected a Gen-Tech diagnostic computer(hand held) to the truck and it gave me a 'high voltage across the ignition control module' error. I replaced the ICM and I still have the same error. I hear my fuel pump engaging and everything else sounds good. My oil pressure is low due to a botched job my buddy did on my oil pan. Would that cause that high voltage error though? My fuel gauge has been flippy floppy but I hear it engaging, could it be a ground wire? That happened before but nothing happened when I turned the key that time, the ground wire fell against the tank. Or could it just be water under the engine near the fire wall on electrical components, since I did see water near my ICM? So many angles to come from and I'm trying to dry things out but Ohio has imperfect weather this time of year, rain one day and below freezing the next. Any help or suggestions would be awesome. As a single mom I try to do what I can myself, plus I know it'll get done right but I'm lost right now and need a wee bit of advice and/or direction. The truck has 228,000miles on it. still a youngin! LOL

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Sounds like the fuel pump sorry. you can look for fuel pressure at the rails, but the issue with the fuel gauge is common right before the pump goes. check for spark, then fuel. need both to start it.

Posted on Dec 25, 2013

Testimonial: "Thank you. I'm going to borrow a fuel pressure gauge and see if that tells me anything. Seems like I'm changing these fuel pumps every couple of years. I had the pressure checked in Aug because I thought something wasn't 100% then but I was told everything was ok. I'm thinking that was the start of what is going to end up being my problem. Gotta love all of the plastic that goes into these parts anymore. Thank you again Keith."

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  • Yankee Belle
    Yankee Belle Jan 03, 2014

    Turns out, my fuel pump is still functioning properly, but I'm watching it closely because the gauge isn't responding right. It turned out to be my cap and rotor again. I just replaced them with the manufacturers suggested parts over the summer and they didn't hold up...again. This's the 8th cap and rotor set in a year, year and a half and I just replaced my distributor over the summer as well. No t sure what's going on there and no diag computers are picking up a problem. I changed the plugs and wires, hoping that'll help in some way. Hmmmm...til next time

  •  Keith
    Keith Jan 09, 2014

    Okay thats very strange, I wish i could see what they look like, If they are burnning out ~ my next step would be to change the coil & the coil wire. if they are cracking then you have a faulty distributor like maybe a wobble inside & the rotor button is in time making the cap brake. If you can post a pick that would be great help but 8 caps is crazy. I wish you well & please follow up.

  • Yankee Belle
    Yankee Belle Apr 06, 2014

    It turns out that the cap and rotor were bad yet again, not sure why. It fired right up and has been doing fine so far. No one's sure why it's chewing and spitting out caps and rotors so often. Thank you! Sorry it took me so long to get back again, life's crazy.



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SOURCE: truck starts but won't stay running

You may have a problem with the contacts in the ignition switch (not key part), when you crank the engine a signal is sent to the fuel pump to run, when it starts and you let off the key another set of contacts keeps the pump getting power Through a relay), these are known as crank and run modes.

Posted on Aug 04, 2008

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SOURCE: 2000 GMC Safari AWD Suddenly won't start

Okay so I have the same issue with my 1999 Gmc Safari!! Out of frustration one day I sat in the car and was ready to blow it up when I noticed that the "SECURITY" light was on every time this happened!!! I would wait for the light to go off and the car would start. I spoke to my mechanic friend and he said that if it was a security sensor problem it will reset itself after 10 minutes, and the car will start!! YOU must leave the key in the ignition and in the on position in order for it to reset. Next time you have the issue TRY THIS!! It may be your long awaited solution. This has been going on for about 5 years now for me....

Posted on Jun 18, 2010

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