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Pickups Chevrolet Silverado & GMC Sierra Chevy Silverado and GMC Sierra Starting Problems
193 messages, Last post on Nov 16, 2009 at 4:26 PM
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2002 Chevy C1500 4.3L V-6, auto trans, 2wd, reg cab, short bed (149,795 miles). Driver said it stalled on highway suddenly, but never had this problem before. Now it won't start and was towed to my shop. I do mostly high performance muscle car work, but am helping a friend on this one and I'm stumped. So far, I've replaced the fuel filter, air filter, and spark plugs; I think they were the original plugs! And I've verified over 55psi cranking fuel pressure at the fuel rail check port behind the throttle body. It was delivered 2.5 qts low on oil, and the "Check engine oil level" light was on. I've added the correct amount of oil. There are no signs of external leakage, and the intake has a heavy costing of oil inside the plenum. It’s being sucked in from the PCV valve I’m assuming. The truck's SES light has been on for a very long time judging from the electrical tape the owner put on the dash to cover it up! My AutoXray CodeScout 2500 can't read the ECM. Says: "Not Connected" even though the plug is securely connected all the way in and the key is on. I've confirmed the correct operation of my scanner on my '05 F-350, so I know that it's not the problem. There are only 5 pins in the OBDII connector under the dash of this ’02 truck. That doesn’t seem correct. Any ideas? Thanks, Mike
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Replying to: dynomutt (Apr 13, 2008 3:30 pm) With a truck that abused it doesn't suprise me that the OBD-II won't function.
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Replying to: obyone (Apr 13, 2008 4:09 pm) You're right about the J1850 VPW connector. Here's the layout: 16=orange 14=green 5=black w/ white stripe 4=black 2=purple Do you have any idea how to fix the OBD-II so I can read the computer? Thanks, Mike
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Replying to: dynomutt (Apr 14, 2008 9:22 am) Have you tried testing the individual connectors for power with a voltmeter? I understand you're doing this as a favor. That price of this favor is really high and I would consider it a favor if the guy took his truck somewhere else. Electrical problems are a pain cause they sometimes take way too long to troubleshoot. Course this may not help your situation. Oh one last thing. Have you checked the fuses. If I'm not mistaken the OBDII is on a fused connection.
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Replying to: obyone (Apr 14, 2008 11:10 am) Thanks for you help so far. Mike
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Replying to: dynomutt (Apr 14, 2008 11:21 am) thanks Leon |
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| I own a 99 silverado,5.3.had problems starting in the pastso i came here.I changed the full pressure regulater and it was fine.The problems arose again so i changed it again oops did'nt help.filter is good,pressure seems good.can anyone give me a punchlist to check?new battery starter fuel filter,air filter the basics have been addressed. | |
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Replying to: yamahog (Jul 16, 2008 3:10 pm)
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I have serched but didn't find the same problem i'm having so this is it. I have a 1997 gmc that will not start, I have 60psi fuel for the first two seconds or 50+ while trying to start. It will start and run if you put gas, starting fluid etc.. down the intake. but will not start back unless you do the same. It has not set a "check enging light" so I don't think it would have a code bit set. This is not the first time I have ran up on this problem, I had a similar problem with a 99 Tahoe. It would start then stall, most of the time while the air was damp. Thanks in advance for any ideas. Lynn Davis |
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