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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#10763 09/28/2003 7:16 PM | Joined: Feb 2000 Posts: 203 Shop Shark | | Shop Shark Joined: Feb 2000 Posts: 203 | I suppose I should ask here too;
My buddy was just over here and has a problem with his work truck.
It's a 1991 350 TBI with an RV cam in it that is suppose to be "computer friendly." The foolish thing is constantly hunting. It runs down to 600 rpm and then darn near stalls, then it picks up rpm's to about 1000 and then after about 5 or 10 seconds starts all over again. This is a professionally rebuilt engine, cost him about 3 grand if I remember correctly. He's had it back to the shop that installed it a gazillion times and in his words "replaced every sensor on the thing." I told him about the help I've seen on the Stovebolt Page and he asked me to drop the information on and see what surfaces. Anyone have any creative thoughts on the matter? Thanks a lot in advance. | | |
#10764 09/29/2003 1:45 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Was the cam timed correctly? Have all the possible vacuum leaks been eliminated? It smells like a vacuum leak to me.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#10765 09/29/2003 5:44 PM | Joined: Aug 2003 Posts: 264 Member | | Member Joined: Aug 2003 Posts: 264 | Has a diagnostic been run yet? The nice thing about computer controlled engines is that you can plug into the computer to see what it is seeing. Even though sensors have been replaced, the right signal may not be reaching the computer due to wiring problems, bad connections, etc. | | |
#10766 09/29/2003 6:05 PM | Joined: Sep 2002 Posts: 158 knuckle head | | knuckle head Joined: Sep 2002 Posts: 158 | If all else checks out ,the GM throttle body injection is a simple reliable system, but has very little tolerance for for aftermarket cams .It just may be the TBI can't cope with the "friendly" cam despite what the cam maker might say.The cam maker may have a correction computer chip to help out. | | |
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