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View Full Version : lb7 pto switch sends idle to redline after flash



MATCO21
March 14th, 2011, 05:05 AM
I have installed a pto switch to my ecm to use the cruise control switch to elevate idle in cold temps to keep the truck warm. after I reflashed my ecm to compensate for change in gear ratio, when I use the pto switch the engine hits the rev limiter until I turn it off. I checked the pto setting in my flash and it is set to 2200 rpm. What am I missing? by the way the only thing I changed is the gear ratio and speedometer pulses. Has anyone know anything about this?

ChipsByAl
March 14th, 2011, 05:23 AM
If you put the stock/previous tune in it, does it do the same thing?
Al

MATCO21
March 14th, 2011, 09:52 AM
No if reload the stock tune it works fine.

MATCO21
March 24th, 2011, 11:36 AM
Really no answers?

THEFERMANATOR
March 24th, 2011, 02:33 PM
What year truck and is the modded tune your flashing in a different OS than your stock one or is it your stock one modded?

MATCO21
March 28th, 2011, 12:18 PM
2004, no OS change. just speedo.
Has anyone used a PTO on a LB7 with efilive?