engine guru's! could this cause a lean condition?
Thread Starter
Le Mans Master
Joined: Oct 2000
Posts: 5,474
Likes: 80
From: raleigh, nc
engine guru's! could this cause a lean condition?
i think i damaged my cats a few months back when not thinking about them at the track, i put some good ole 114 octane in the car.
About two weeks later, i had to go to the dealer to get the o2 sensors replaced. they never did check the cats.
well, i went to the dyno and the car is running extremely lean. could a stopped up converter cause me to go lean and could it cause other adverse conditions to the engine
About two weeks later, i had to go to the dealer to get the o2 sensors replaced. they never did check the cats.
well, i went to the dyno and the car is running extremely lean. could a stopped up converter cause me to go lean and could it cause other adverse conditions to the engine
Safety Car
Joined: Feb 2003
Posts: 3,865
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From: Chicago il
Yep, its sendign bad codes to the computer tricking it into thinking its ruunig too rich and the computer will lean you out. You're gonna have to get new cats, or get rid of them all together and get O2 sims
Thread Starter
Le Mans Master
Joined: Oct 2000
Posts: 5,474
Likes: 80
From: raleigh, nc
Originally Posted by Monster231
Yep, its sendign bad codes to the computer tricking it into thinking its ruunig too rich and the computer will lean you out. You're gonna have to get new cats, or get rid of them all together and get O2 sims
i planned to get those cats off the car very soon and go off-road all the way.
Le Mans Master
Joined: Jul 2002
Posts: 7,370
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From: Slave to the evil empire
Cruise-In V Veteran
St. Jude Donor '04
Originally Posted by Hiteck
My cats are the same. Either the previous owner gutted or damaged them. Had mine on the dyno and it was lean. Reprogramed. Mine also smells terrible. Do you have that same issue?
Pro
Joined: Mar 2004
Posts: 653
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Originally Posted by Y2K253SS
I agree. It could possibly be the right mixture before it hit the cats, then the cats lean the hell out of the mixture by the time it hits the exhaust pipes where the a/f meter is located.....
This is a rare failure mode though, as the oxidation side is downstream of the exhaust gas flow relative to the reduction side of the honeycomb.
Usually the reduction side gets overheated and damaged, causing increased NOx emissions as the cat can't break 2NO molecules into N2 and O2.
If yours got overheated it's time for replacement either way.
