High LTFTs after Filter
08-21-2006, 01:09 AM
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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?
