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Discussion Starter #1
i had a cel and i got the codes pulled and i got catalyst efficiency below threshold and engine overboost condition. I have a 3 inch tbe w/ highflow cat and an open element filter. Are they either somethin to worry about, can someone explain what overboost is to me. I think the cat efficiency is because of the the high flow cat. Can overoost be because its like 10 degrees out or what, lil help please
 

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Did you do any CEL fixes when you installed the exhaust? Some HFCs cause a CEL and some don't, but there's a couple of easy fixes for it. I'm not sure on the overboost, but since you don't have boost control, you do have an exhaust, and it is cold, it may be causing a boost spike.

Turbolarry, any experience with the overboost CEL? Carkid, for now, you might want to disconnect the battery and let it reset...then see if those CELs come back. You can do a fix for the cat CEL, but the overboost one should go away after a reset, I believe.
 

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Discussion Starter #3
thx for the info, u mentioned fixes for the cat cel, would that just be a o2 sim? or are there other things i can do, thats really the least of my worries though, i will let it sit unplugged for a day or 2 and see how that goes. thx for the info and help
 

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Discussion Starter #5
nothing as of yet, the only two things i have done are the tbe and intake filter. MY boost does creep will a mbc cure that?
 

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Usually the boost code comes when the car has hit fuel cut twice. It must have hit it.....I doubt its boost creep.
 
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