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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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92 chevy suburban had plugs/wires cap/rotor changed

Customer Question

92 chevy suburban had plugs/wires cap/rotor changed cat.convert.removed. i changed o2 sensor runs worse than everbefore hesitates, acts like its missing
Submitted: 1 year ago.
Category: Chevy
Expert:  Jerry Newton replied 1 year ago.

Does it run badly at idle, when accelerating, when cruising? Cold or hot? Give me as much info as you can about it.

Customer: replied 1 year ago.
idles slighty rough worse accelerating changed rotor rattling coming from dist. area when warming up
Expert:  Jerry Newton replied 1 year ago.

Has anyone checked the ignition timing on this? There is a procedure that has to be followed.

The thing about these old TBI engines is that the ignition timing is crucial, because the computer assumes that it's correct and bases everything else it does on this assumption. If it's off, even by a few degrees, the engine can run horribly. And ignition timing is the one thing that most people overlook, as well.

Customer: replied 1 year ago.
taking off the cat. conver. add to the problem?
Expert:  Jerry Newton replied 1 year ago.

No, the computer doesn't care if there is a converter present or not. That makes no difference here.