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Pickups Chevrolet Silverado & GMC Sierra Chevy Silverado and GMC Sierra Electrical and Computer Questions
354 messages, Last post on Nov 20, 2009 at 11:13 AM
You are in the Chevrolet Silverado & GMC Sierra Forum. Your Host is kcram
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Hi everyone, Recently, my 2k Silverado 4.8L has been dificult to start when it's hot. I suspected my EGR valve so I disconnected it to see but got the service engine light on now. I know it's not the EGR now but the light stays on. I remember my dealer telling me once how to reset this but I forgot. Could anyone help? Thanks
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Replying to: gangof4 (Sep 16, 2006 11:00 pm) Your RPMs do increase when the transmission downshifts but not as much as the tach would indicate. Any sensitive electronic meter will do that given a sudden change in input. It's called overshoot. I don't think you have anything to worry about. |
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Replying to: canayjun64 (Oct 20, 2006 4:47 am)
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Replying to: jneal (Oct 23, 2006 5:55 am) Now I'll have to see why it's so hard to start when the engine is warmed up. Thanks again!
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My 2000 GMC 2500HD 8.1 L is reporting the following trouble codes: 1)MAF or VAF A ckt range/perf 2) MAF or VAF A ckt low input 3)IAT Sensor 1 circuit High Input 4) Manf Cntrl Veh. Spd Idle Speed Control Auxiliary Inputs I have checked visually for any loose connections or vacuum hose issues. Can anyone sugest how to isolate the problem to the root cause??? Thanks
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Replying to: lon986 (Nov 05, 2006 10:31 am) I would check the MAF and the IAT sensor. Either one can cause all the others but I lean more toward the IAT sensor. |
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Replying to: canayjun64 (Oct 23, 2006 6:34 am) In regards to my previous posts, I have had my truck serviced and it turns out that the Fuel Regulator was causing a poor engine start up (when the engine is warm). Just sharing the knowledge...cheers! |
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Replying to: canayjun64 (Nov 08, 2006 9:06 am)
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