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Vauxhall with high fuel trims

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1 month 3 weeks ago #67213 by loft.insulation
Vauxhall with high fuel trims was created by loft.insulation
Hello everyone,

I've got a vauxhall zafira which has 20% LTFT and it gradually increases while idling. The short trim would be creeping from 2% to 4% on idle too. Holding the RPM to 3000 makes the long trim fuel reduce to 0% and the short trim increases to 10%. 

Now, it looks like a vacuum leak, but if it was then the short trim wont be increasing to 10% right????

Scratching my head with this one...

please someone get back to me cheers

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1 month 3 weeks ago - 1 month 3 weeks ago #67222 by Chad
Replied by Chad on topic Vauxhall with high fuel trims
The job of the Long Term Fuel Trim is to keep the Short Term Fuel Trim as close to zero, as possible. Long Term + Short Term = TOTAL Fuel Trim.

High Total Fuel Trims that improve with raise RPM's is a classic sign of a vacuum leak.
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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Last edit: 1 month 3 weeks ago by Chad.

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