FSC Forum - View Single Post

Jasper911 · 02-23-2009, 08:28 PM

My problem isn't solved either. I have tried three different egrs, one new, one from old engine and one from new engine before rebuild. All the same.

Still runs very rich. even blows a blueish smoke at times under load just off idle, but not oil smoke. This is unburnt fuel. The throttle body is the only thing I have never changed out and it has 255K. Possible worn throttle shaft giving false TPS info?

It will idle up briefly after letting up from giving it throttle. Also notice an oscillation up and down while parked in gear idling. At times under acceleration (from a stop) it hesitates then when I let off it responds. Like it's doing the opposite of my command. Annoying and seems hard on the trans and drive line.

02-23-2009, 08:28 PM	#151
Jasper911 Registered User Join Date: Dec 2008 Location: KY Age: 38 Posts: 13	Re: 1991 chevy 1500 5.7 tbi erratic idle My problem isn't solved either. I have tried three different egrs, one new, one from old engine and one from new engine before rebuild. All the same. Still runs very rich. even blows a blueish smoke at times under load just off idle, but not oil smoke. This is unburnt fuel. The throttle body is the only thing I have never changed out and it has 255K. Possible worn throttle shaft giving false TPS info? It will idle up briefly after letting up from giving it throttle. Also notice an oscillation up and down while parked in gear idling. At times under acceleration (from a stop) it hesitates then when I let off it responds. Like it's doing the opposite of my command. Annoying and seems hard on the trans and drive line.