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I have an auto 2001 7.3 with 137,000mi. Mostly stock, except for DIY intake, 4" turbo back and TW chip.
It surges between 1800-2000rpms when I am ~1/4 into the throttle, most noticeable when doing about 30mph, or up a hill. If I increase or decrease the throttle it stops. Isn't nearly as bad at other speeds, if even present at all. Don't think it happens when its cold, if it does its barely noticeable. The truck also gets about 15-17mpg with the chip, and 13-15mpg without the chip.
I have a friend who is a Ford diesel tech, and he plugged it in but couldn't really find anything wrong other than the EBV sensor reading a couple PSI high, but we replaced that and that reads normal now. Also replaced the ICP sensor because there was oil in its electrical connector. I have replaced the accelerator pedal sensor with a couple of new dormans and no change.
The truck does run a bit smoother after replacing the sensors, but still surges and no change in MPG. Any help would be great!! Thanks.
Last edited by Scerb; 02-18-2012 at 07:04 AM.