The ole split BLM issue
Le Mans Master
Joined: Sep 2001
Posts: 7,928
Likes: 1
From: More cowbell...
St. Jude Donor '04
I would think (someone tell me if I am wrong) that a clogged cat will cause that side to run more rich. Think of an engine as a pump- pump in air, add fuel, add spark, pump out exhaust. Air+fuel+spark=exhuast+energy.
Now, if a cat is clogged, you have more back pressure and less flow for the exhaust on that side. Thus, you cant have as much air entering the intake on that side (because where is that extra exhaust/air going to go?). The computer controlls how much fuel to add, and this does not change. So, if we had a perfect A/F ratio on the unclogged side, on the clogged side we have the same fuel, but less air, thus a rich condition.
Now, if a cat is clogged, you have more back pressure and less flow for the exhaust on that side. Thus, you cant have as much air entering the intake on that side (because where is that extra exhaust/air going to go?). The computer controlls how much fuel to add, and this does not change. So, if we had a perfect A/F ratio on the unclogged side, on the clogged side we have the same fuel, but less air, thus a rich condition.
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
Hey Mark, I sorta forgot about this post. My spit does weird things. It does go up the RPM range aways. It has been awhile since I looked at it, but I messed with it so much that sometimes I could get it to swap from side to side. I couldn't ever get it where I wanted it so I gave up.
