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Transitioning from previous thread to new one-- Replaced the water pump and performed the 60,000 mile service in my 04 Turbo Cab. Car runs great except now I am getting overboost to 1.0-1.3 bar. I don't hold it there to be sure. That said, I realize it is likely a vacuum issue but the only lines I touched during the repair are the one from the Y-Pipe to the switch and the one from the switch to the plastic line that goes to the driver side of the engine. Flashlight and inspection mirror show the 3rd line on the underside of the switch to be connected. Any thoughts on where else to look?
Err well here it is the first code to pop on the problematic ctt P0234 overboost. Was driving to today and booted it a bit and felt flat to redline Wtf, almost like the variocam didn't switch to high lift because the boost gauge said +0.8 bar still as per spec. So I whipped out the trusty v-checker which is always in the temperamental Pig in case, and it shows the P0234 code.
I know the possible causes and have read a lot of posts of this code but not found any with fixes except loose piping broken piping which at the moment I'm thinking I don't have any (all bloody new). N75 valve is new, MAP sensor is original but I've cleaned it today and before it didn't make any difference then or now. Turbo problem possible but unlikely I think. So what does that leave?
If I clear codes it won't return in short run but did after many Km today return and cleared again.
No here is the only interesting thing about it, when the code is active it goes into a limp mode flat performance and the stutter hesitation I suffer with since I got the car goes away and it drive smooth but slower of course. I clear the code and get boost back but also the kangaroo stutter stammer acceleration.
If I disconnect the map sensor exactly same result but a difference code like P???? Underboost which makes sense.
So guys what makes a turbo engine do this?
Just for fun. Recently had my 120k mile service completed for my 04 CTT. Clean bill of health and ran good sounded better felt great. Soon there after I happened across a gent in a Viper truck, coming up behind me fast flashing his lights blowing his horn and then pulls along side window down and thumbs up. I think to myself, " ...man I too old for this sh*t...", but give him a go anyway. PSM off, suspension lowered and to sport, 3 horn blasts and floor it! After a huge breath and accompanying roar and turbo lag, it's 1st gear and off we go! Needless to say it was fun. More to say after he caught up; "...that's not stock!" No it isn't I reply. So as I let him speed of I continue my leisurely sub 60mph drive home. Along the way I get PSM failure visit workshop. Okay...next up check engine light. Hmm...next up tranny lights up like it's in safe mode but is audibly and physically shifting fine. Temp is a little higher than normal and hmm...no more than .3 bar boost at WOT? Okay what did I break now? SO, at home codes pulled: 2187, 2198, 2281, 0299.
Okay smoke 'em! Turn out I've manage to "break?" the old worn out breather hoses and the intake distributor is leaking! Gee Bevis...anywho fun weekend for me! So, while I'm in there I think I'll swap out the diverter valves and control lines as well. Just wanted to share.