High LTFTs after Filter
Thread Starter
On The Tree
Joined: Aug 2006
Posts: 107
Likes: 0
From: SW Virginia
High LTFTs after Filter Common problem. I noticed this on idle, the WB AFRs are ok open loop and WOT.
After a low resistance filter the LTFTs go (+). As an experiment I removed my air filter to simulate this. Sure enough (for whatever technical reason = I do not care) LTFTs go (+). Maybe up to 15. This is from idle through some RPMs until I go into open loop. Ah so!
I don't think this is harmful, but I like a fuel trim to be as it was intended. Isn't that why they call it "trim"?
I was going to adjust via the "MAF calibration". Simplest most direct route, the other tables are complicated. I have a C6 Z06, so no VE tables.
Any thoughts?
After a low resistance filter the LTFTs go (+). As an experiment I removed my air filter to simulate this. Sure enough (for whatever technical reason = I do not care) LTFTs go (+). Maybe up to 15. This is from idle through some RPMs until I go into open loop. Ah so!
I don't think this is harmful, but I like a fuel trim to be as it was intended. Isn't that why they call it "trim"?
I was going to adjust via the "MAF calibration". Simplest most direct route, the other tables are complicated. I have a C6 Z06, so no VE tables.
Any thoughts?
