1999 Chevy Suburban STILL not running

jcmnh
90

Asked by Nov 24, 2012 at 11:08 AM about the 1999 Chevrolet C/K 1500 LS 4WD

Question type: Maintenance & Repair

1999 Chevy Suburban k1500 138,000 miles 5.7 L Vortec engine
vehicle was driving perfectly, accelerating smoothly, plenty of power prior to this, even driven that morning. stalled at
red light on 11/1/12 and has not started since.
no backfiring, no sputtering, no misfiring, no skipping.
sounds like it wants to start, but will not turn over
new battery
new plugs
timing chain tested by getting the #1 cylinder up on the compression stroke and rotor button sitting on #1
cylinder/plug wire and it is working
all fuses working
getting good white spark
ignition modulator replaced
throttle position sensor replaced (handheld scanner threw only this code)
fuel pump has 62 psi
sending unit appears to be working
will not start even when spraying ether on it
security light is on and steady when trying to start


Could it be:

crank sensor?
camshaft sensor?
spider injector?

9 Answers

John Saffrahn
30,145

No its the security system. I'm pretty positive its identical to all the GM cars but I might be wrong and if i am, trying this won't hurt anthing. Try to start the truck and then release the key and leave it in the on position for 10 minutes. The security light will go off after the 10 is up. After the light goes out turn the key off and retry starting. It may start up or you may have to go through this process 2 more times for a total of 30 minutes. Make sure the battery is fully charged and it would be great if you had a deep cycle trickle charger. Like a 2amp while it sits with the key on. The security system disables the fuel injectors.

7 out of 7 people think this is helpful.
jcmnh
90

I'll try it! Thanks! The security light is on and steady when I try to start it- no flashing....

1 out of 1 people think this is helpful.
John Saffrahn
30,145

Some don't flash till a little bit after you try to start it and it sits.

jcmnh
90

I do have a battery charger that I can attach to the battery during this- I will try this tomorrow morning.... thank you

dogmanaev
45

check starter and wires going to it

John Saffrahn
30,145

Hey dogmanaev, this question is over 9 months old bud, and if it was the starter or wiring to it then the issue would be the engine isn't turning when the key is turned.

Miguel Velasco
10

I have a 1999 4x4 chevy suburban 5.7 that wont start was runnin and just recently stoped i put a new distriborator,cap,modulator and electric plug that goes inside put new plug cables and still wont start

1 out of 1 people think this is helpful.
ScottWright66
0

google newrockies.com its a security bypass for gm cars. I have a 1999 as well and I put this module on it 3 years a go and runs like a top. fix is like 200.00 and a few hours work under the dash.

Valentine Charles
10

My 99 Suburban would run for half a second and shut off... I thought it was the fuel pump... When it acted up, i shut the key off and tried again. When it wouldn't start I shut the key right off. Meanwhile I got out and tried jumping the fuel pump relay, got back in and it started. Drove home fine, put the relay back in and it ran fine again... thought yep its definitely a fuel pump. A few days later it acted up again. After playing with the relay it started again. So I replaced the fuel pump. A few days later it acted up again. Ran half a second and shut off... this time I left the key on and noticed the security light was flashing... had I left the key on long enough when it didn't start before, I could have saved myself the cost of a fuel pump. I got a new key from GM (non chip type) saw it had more teeth than my old one, and it worked fine for a few days, then back to running half a second and shutting down. Just for fun I coated my key with graphite lube and worked my new key in and out and on and off... I'm on my third week with no problems. I don't know for sure that my problem is fixed but so far so good. If I have any further problems I will be most likely installing a bypass from newrockies.com ... I have heard that the security feature can be turned off in the ECM but that the security light will stay on. That may be something else to check into.

1 out of 1 people think this is helpful.

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