Very high long term fuel trims

Jordo!

Mods?

Assuming sensors are all good, I'm thinking big vac leak somewhere and the O2's are adding in tons of fuel to compensate (i.e., high positive trim means O2's are reading lean).

Any other codes? Like slow sensor response/heater circuit? MAF codes? Have you had the primary O2's in and out recently?

Short term trims will be small because the LTFT is handling all of the constant correction, so the STFT's will be simply hovering around the overall correction of the LTFT's.

Can you reset your trims to zero? If so, you will probably see massive STFT's initially.

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