Chevy Suburban Poor Performance

MRARCHER

MEMBER
CHEVROLET SUBURBAN

My 1995 Chevy Suburban, automatic, 166,000 miles, 5.7 L engine is running very roughly at low RPM's. I have had a code appear, 43, which indicated an Oxygen Sensor issue. I have replaced that to no avail. I have also replaced spark plugs; fuel filter; air filter, and coolant sensor. Nothing works. No code has reappeared. It almost sounds and feels as if it is choking, or flooding at 700 to 2000 RPM's, then runs fine above 2100 RPM's. I was advised by one mechanic to have the catalytic converter drilled into, to see if it was clogged; but another mechanic advised that it would run the reverse of what it is: poor at higher RPM's, fine at lower. It idles fine, with an occasional stutter and die, but nothing consistant. Any thoughts?

1 Reply

WAYNO

MEMBER
7 POSTS

A code 43 I believe is actually a fault in the ESC circuit. Could very well be a timing issue. I would check out the ESC module which is mounted on a bracket on the right hand side of the intake manifold near the throttlebody. Also check the wiring because it gets pretty hot up there. Also you may want to have your ignition module tested. May not be the cause of your problems but is deffinately worth checking out. Knock sensor may have failed too!