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1999 Chevrolet Suburban 1500 LT, 5.7 liter V8, 135,000 miles Sporatically will not start
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Bookmon
New User
May 2, 2012, 7:38 PM
Post #1 of 2
(2507 views)
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1999 Chevrolet Suburban 1500 LT, 5.7 liter V8, 135,000 miles Sporatically will not start
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We own a 1999 Chevrolet Suburban 1500 LT, 5.7 liter V8, 135,000 miles. About 2 years ago, it started sporadically leaving us stranded. You’d hop in at the house, crank it up with no problems, drive to the store, and come out with ice cream and NUTHIN’. The engine would just whine away making that “I wanna start” sound but it would not turn over and catch. Eventually, you could run down the battery just trying to crank it. One night, it even left us stranded in downtown Birmingham, Alabama on a 20 degree night in November. I can not recall the number of times I’ve ridden home in a tow truck cab. But, Not every trip; every time.
We’ve changed the big starting fuse under the hood- twice. We changed the fuel pump-twice. We changed the battery. We changed the rotor and cap assembly. We had it in and out of shops spending thousands on diagnostics and no one finds a thing wrong.
After all this, yes even after the cold night in November- the wife loves this Suburban. It’s big and boxy. Lots of room and rides great.
Have you ever heard of such a thing? Have you any advice of how to end this game of “Drive Away Roulette”? It’s gotten to where we’re afraid to drive to the store just 3 miles away.
Sincerely,
Bookmon
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Hammer Time
Ultimate Carjunky
/ Moderator
May 3, 2012, 3:26 AM
Post #2 of 2
(2460 views)
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Re: 1999 Chevrolet Suburban 1500 LT, 5.7 liter V8, 135,000 miles Sporatically will not start
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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