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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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Replying to: mshine (Jul 10, 2007 6:29 am)
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I have a '99 Silverado that won't start. Several months ago I replaced the fuel pump, truck ran great. Check engine light came on weeks later, codes were P0440, P0446 & P0452. I was told the codes were not to important, so I did nothing which brings me to my current problem. Last weekend I had trouble starting the truck. It acted as if it wasn't getting gas but I got it cranked with it spitting & sputtering. I changed the in line fuel filter thinking it was clogged. That didn't make any difference. I talked with auto parts clerk who suggested it could be the air flow sensor and that I could spray carburator cleaner into the ??? & if it started then yes it was the sensor. I went home and tried it and behold it started. I live 20 miles from the closest auto parts, so I drovve back to town & got the part. Installed it but still won't stay cranked. I have no clue as to what else to check, any help would be great. |
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Replying to: ahinson (May 31, 2008 5:25 am) It then just began working again back in march and worked fine ever since until about a week ago when I went to start it on a Monday morning(sat 2 days) and it would not start? took the other car to work and that evening it started right up. Ran it for a while and shut it off and it started right up again. Left it overnight and it has not started since? It has gone from very dry to a lot of rain and humidity lately but other than that nothing else has changes. One other thing - if it is in the "Not Starting mode" the check engine light is on but as soon as it begins to work again the light goes off? Help - I do not want it to go to the shop for another 2 weeks and not work any better than before. By the way, the truck has 175,000 miles, been well maintained and other than this issue runs great and has a clean bill of health per my mechanic who had it for 3 weeks and shook every wire back in March. I am befuddled Bob Urban |
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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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