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mike100 · 09-30-2011

it would be interesting to see what you get with a Tech1A hooked up to see what the O2's read. I would repair the bad cat to have equal restriction on both banks and possibly replace an oxygen sensor if one is lazy...at least have a 3rd one for diagnostics.

can you swap O2 sensors from left to right to see if the problem moves?

09-30-2011	#15
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,786	Re: 1990 exhaust manifold issue... it would be interesting to see what you get with a Tech1A hooked up to see what the O2's read. I would repair the bad cat to have equal restriction on both banks and possibly replace an oxygen sensor if one is lazy...at least have a 3rd one for diagnostics. can you swap O2 sensors from left to right to see if the problem moves?