Time required to establish Long Term Fuel Trim

ITR 1102 · Post by **ITR 1102** » Sun Apr 04, 2010 10:03 pm

How long must I datalog in order for the long term fuel trim to be updated / give a correct reading?

My short term ranges between -2% and 8%, but the long term shows 0%. I only logged for 10 minutes while on the interstate.

Post by **Spunkster** » Mon Apr 05, 2010 9:40 am

It all depends on the driving habits. It will usually take much longer than 10 minutes as it must average the short term trims over time.