One of my friends just bought a used 05 CR automatic and it has an issue that has me and all my friends baffled.
When in neutral or park only, if you blip the throttle lightly, it'll jump up to ~2k and idle back down slowly in steps over 6-8 seconds. Reminds me of toggling rpms down with a pto switch on a big rig if that makes more sense. The truck drives fine down the road. The only known mods are straight exhaust, autometer gauges, and a diablosport programmer. It does the idle issue even on the stock tune. No check engine lights and none of the sensor readings look out of place on a scanner. Anyone ever seen anything like this before?
The other issue is that the truck will peg a 1600F egt gauge in 5 seconds or less from a rolling ~30mph at WOT even on just the tow tune. Boost is 25-28psi and just a haze out of the stacks; no coal. It's an autometer gauge and probe, reads ~350F at hot idle and ~100F for every 10mph going down the road just like it should. I know these motors run hot with the small stock turbine housing but this seems excessive to me. The truck scoots but isn't fast enough to have injectors or pump work in it. The airfilter is good and clean, theres no cat to plug up, no smoke, ic isn't plugged with crap, fan clutch is good and working, and no driving issues.
Any ideas would be much appreciated. Thanks!
When in neutral or park only, if you blip the throttle lightly, it'll jump up to ~2k and idle back down slowly in steps over 6-8 seconds. Reminds me of toggling rpms down with a pto switch on a big rig if that makes more sense. The truck drives fine down the road. The only known mods are straight exhaust, autometer gauges, and a diablosport programmer. It does the idle issue even on the stock tune. No check engine lights and none of the sensor readings look out of place on a scanner. Anyone ever seen anything like this before?
The other issue is that the truck will peg a 1600F egt gauge in 5 seconds or less from a rolling ~30mph at WOT even on just the tow tune. Boost is 25-28psi and just a haze out of the stacks; no coal. It's an autometer gauge and probe, reads ~350F at hot idle and ~100F for every 10mph going down the road just like it should. I know these motors run hot with the small stock turbine housing but this seems excessive to me. The truck scoots but isn't fast enough to have injectors or pump work in it. The airfilter is good and clean, theres no cat to plug up, no smoke, ic isn't plugged with crap, fan clutch is good and working, and no driving issues.
Any ideas would be much appreciated. Thanks!
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