Intercooler (CAC) cooling fins are oily
Preparing to remove the lower hot-side cac tube/boot, I've noticed that the cac cooling fins on passenger side are oil covered on motor side of cac.
Is this typical, or traumatic ?? |
Is the CAC boot oily?? Does it have cracks in it. That could be the source. While the boot is off you could also pull the cold side and do a pressure test with an air hose on the cooler itself. I wouldn't put over 20 psi in it if it were me.
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Lower CAC Boot exterior: 50% was covered with thin layer of oil/road grime.
Interior had small amount of dirty oil. Cleaned and thoroughly checked for any crack/pin hole/wear mark/etc -- looks and feels good. Put my original MAP sensor back on with a 3/16 hose (Tight) & did a short road test. Truck runs fine - except for wot, then Limp Mode --- old issue. DTC = 1, so PCM apparently won't let me "lay rubber". |
WOT then limp mode sounds like a sticking turbo or vgt problem minus any other info.
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I need more info on what triggers Limp Mode.
My suspicion is PCM insists on All parameters being in tolerance - or Limp Mode until problem / code cleared. If that is correct - then any of 15 or so issues (to include sensors) could be the trigger. |
Have you disco'd the batteries and done a re learn on the VGT? That helped my driveablity problems when I first got the truck
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Yep, yesterday.
Result = P0603 Code (due to KAM) -- cleared code & continue guessing. |
Perhaps using the official term "Limp Mode" is inappropriate.
Presently, for a few months now, truck will run just fine (to include towing a 16k 5th wheel trailer through the hills of TN) - Providing I do Not go WOT. If so, it balks at 2900 rpm (4.0 Boost), will Not upshift, & puts out a slight amount of white smoke until I back off the accelerator & allow tranny to upshift. Then, eventually, turbo will spool up to around 20 = 80 mph w/power. Don't know official term of this condition (Limp Di*k ??) |
Limp mode will reduce your power to app. 35 mph and will not go any higher till you do a restart.
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Thanks for clarification.
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