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i started having an issue with O2 sensors not responding and stuck in open loop 100% after it was flashed last night and drove fine last night - today no closed loop WTF im working the problem and...

keep me updated and feel free to ask tips !

i may start a facebook so i can get notifications to help you guys faster - ive had life issues and just got back to the jeep project 1 year later :(

ive been using DFCO it cuts fuel off on decel seems like it would save gas but its very hard on drivetrain ! I have stiff urethane mounts and motor trans dont move much and i feel everything in the...

quick tip !

watching ignition timing at idle can help you determine a misfire or sensor droppout causing a surge or problem

my timing at idle in drive is 17 degree on my 99 cherokee and the...

i have thought of removing all multipliers and making the engine a simulated distributor and carburator like an old school SBC v8 - I have not tested because it wont work for me because i go up...

Sorry ive been away guys lots of trouble with jeep but im back and tuning and ill share findings here to support everyone

I have tested alot of the PCM value and can tell you what and how to...

FYI you need an older HPtuner 2+ to tune jeep engines

the LTFT is telling you what PCM is doing to make 14.7 AFR only time you see actual tune is when your in open loop at part throttle to WOT and...

Hello I am Tom an experienced Tuner and Jeep enthusiest !

I have been messing with my HP TUNER MVPI 2 PRO and want to start a thread on how to tune 4.0 engines.

#1 before starting tuning a...