Join Date: Sep 2008
Location: Oakbank, Manitoba
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What the heck just happened?
I should probably have posted this in the problem section, but it really applies to performance anomalies and it was self-fixing.
This evening I cold started my truck (19*F) and after a minute or 2 off I went. A few minutes later I am at the highway, turn on to it and lightly accelerate to highway speed - well not really. The truck looses power, and as I press the pedal, it revs up to 3500-4000 rpm with the transmission not upshifting so I am still going about the same speed. There is a big cloud of black smoke behind the truck. The parameters are:
EBP 39 psi (maxed out)
Boost 30 psi
ICP 1500 ish
Good fuel pressure
Tune - Extreme X for larger injectors (2 weeks since I re-installed it).
as I let off and pull over to the shoulder. Initially I thought I blew a hose until I saw the gauges. When I saw the EBP and the smoke I though about a blown turbo until I saw the boost. It all just didn't make sense.
So it is now idling OK but the EBP and boost are high, with the VGT about 50%. I drive for a few miles and my thoughts are the turbo may be the problem, but the VGT seems to follow the pedal, but it is 10psi high on both sides with what appears to be a normal VGT. Temps are very low while driving
(under 500*). It sounded like a slight air leak as I drive. I really think the turbo is getting ready to take a dump. However, the transmission is shifting funny and seems to behave like there is no power. The only thing I didn't check at the time was FICM voltage.
So I pull over again, shut it down and start looking for damage but find none. I restart it and it runs perfectly normal for the next 35 minutes and 2 hours later for the 45 minute return trip.
My thoughts are the VGT (not working correctly but indicating change), a sensor or the PCM was having a Microsoft moment.
If this was Halloween I would have thought I picked up a ghost! Strange but true!
Last edited by twoicebergs; 10-28-2013 at 10:40 PM.