EKJOE

Well, This happened 1 full day after spending 5 hours on a mustang dyno with a professional tuning my car.

It ran like a beast for that 1 day. At the end of the first day I did a hard pull off a stop light...WOT hitting VTEC but I wasent redlining. After I slowed down and kept a steady throttle I noticed my AFR was going nuts! Swinging between 11 and 18 wildly and this is under light throttle....The TPS read 5 and I was in 4th gear 3200 RPM.

The motor started to jerk and bog and cut out....Im like WTF is going on here? Its a fully build LS/VTEC with 1800 miles on it, 93 octane and mobile1 syn10/30.

Now when I go WOT it runs real rich,Idle seems to be ok...It goes back to 14.7 half the time and the other half it runs rich in the 12's. Under light throttle cruising well...........

Heres the video.
http://www.youtube.com/watch?v=MwVMRMbq0Ro

HondaFan81

Check your TPS for proper connection, movement due to loose screws, etc.

EKJOE

Im just curious why you think the TPS could be the cause of the AFR going nuts?

I just calibrated it right before tune day, But I will definitly double check it.

alterdcreations

i always do a street tune if its not a dedicated drag car

0mtber

iTrader: (2)

Take the car back to your tuner.

00Red_SiR

Lose ground maybe? I'd go back to your tuner and see what he thinks.

pasaunde

It that a wide band 02 sensor?
The problems sounds electrical to me
I had a bad MAP connection that cause something similar
If you running crome, hondata .......etc, then you should be able to sweep your TPS (0-100 %) and monitor you MAP signal to see if the readings are reasonable.