Ford Mustang Forum - View Single Post - 97 gt pi engine swap problems
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post #1 of (permalink) Old 06-15-2018 Thread Starter
Khenji
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97 gt pi engine swap problems

Had the 99-04 automatic engine swapped into my 97 manual gt at a shop and they swapped over bolt one from the 97 like long tubes, pulleys and cold air intake. Also they had to order a new flywheel for it to bolt to the automatic engine. First time driving out the shop the car seemed to be misifring especially at low rpms, but never threw a misfire code. Under full throttle it would spit/stutter and be very hesitant to go. The shop said it would need a tune because of the modifications and it being the pi engine instead of the npi. Bama sent a custom tune so it's on 87 performance however I'm running 93 octane gas. Only have been driving it tuned for a day there was a little improvement in the spitting but it's still hesitant on full throttle. Also threw codes for

Evaporative Emission Control System Vacuum System – Purge Control Valve,

Catalyst System Efficiency Below Threshold,

insufficient switching of oxygen sensor bank 1,

A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition

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