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CRD turbo Overboost http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=36588 |
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Author: | Capetown [ Wed Oct 08, 2008 5:16 pm ] |
Post subject: | CRD turbo Overboost |
Hi Everyone Im living in South Africa Cape Town, and struggle with my 2.8 CRD Cherokee(Liberty) with an overboost problem. I tried nearly everything. All the sensors like the MAP sensor/Speed sensor/vacuum reservoir were replaced. I did the EGR and I also replaced all the injectors with new ones. I also cleaned the whole fuel sistem. The only other option is now to replace the turbo, or the computer of the car. The overboost only occur under 2000rpm. It also only occur when you drive light foot. Is it maybe the that the vains of the turbo do not pitch back fast enough and therefore keeping the boost higher than what it should be, or is it the computer that interperet the signals from the Map sensor wrong? I would appreciate any help becuase this whole exercise cost me a lot of money so far. Regards Capetown |
Author: | 05infernoCRDL [ Wed Oct 08, 2008 6:08 pm ] |
Post subject: | |
there is a way to manually moce the vanes to make sure they are not getting hung up in a position... that would be my first course of action... i am sure someone will chine in to where this rod or what ever is in the engine bay. |
Author: | nursecosmo [ Wed Oct 08, 2008 6:52 pm ] |
Post subject: | |
It sounds like a problem with the turbo control actuator. There have been some problems with soot building up on the control arm in some vehicles using the same VGT style of turbo. The problem is often fixed by driving WOT once or twice on every tank so that all of the soot gets blown out and the arm archives full extension to rub the deposits off. It has been discovered that driving the VWs with VGTs very gently for fuel mileage is not good for them. using this have had this problem when I used to high of a percentage of waste motor oil for fuel. A can of Seafoam brand (or whatever it's equivalent is in Cape Town) fuel system will get every thing shiny clean. |
Author: | MrMopar64 [ Wed Oct 08, 2008 6:52 pm ] |
Post subject: | |
Capetown, What year is your KJ? If it has the VGT turbo, look for the vacuum actuator on the top of the turbo (facing the hood), there will be a vacuum line running off of it to a modulator on the passenger side inner wheelhouse. If you're sitting still and rev the engine, you should see the rod coming from the actuator move. If it doesn't, either the actuator is bad or the modulator is. If you disconnect the rod from the linkage on the turbo, you should be able to move the lever coming off the turbo by hand if it's not frozen. If your KJ is 04 or older, then most likely the boost reference line that connects to the wastegate is cracked or fell off, or the lesser-likely scenario is that the wastegate is stuck. Let us know what you find! |
Author: | mackruss [ Thu Oct 09, 2008 3:29 am ] |
Post subject: | |
nursecosmo wrote: It sounds like a problem with the turbo control actuator. There have been some problems with soot building up on the control arm in some vehicles using the same VGT style of turbo. The problem is often fixed by driving WOT once or twice on every tank so that all of the soot gets blown out and the arm archives full extension to rub the deposits off. It has been discovered that driving the VWs with VGTs very gently for fuel mileage is not good for them. using this have had this problem when I used to high of a percentage of waste motor oil for fuel. A can of Seafoam brand (or whatever it's equivalent is in Cape Town) fuel system will get every thing shiny clean.
The equivalent product in SA is to use Wynn's injector cleaner. I started using this recently in my CRD and seems to be working okay, time will tell. Can you explain more about WOT i see it appearing on the forums but don't understand the gist of it. |
Author: | Uffe [ Thu Oct 09, 2008 4:10 am ] |
Post subject: | |
mackruss wrote: Can you explain more about WOT i see it appearing on the forums but
don't understand the gist of it. WOT = wide open throttle. Pedal to the metal... you know ![]() |
Author: | mackruss [ Thu Oct 09, 2008 4:20 am ] |
Post subject: | |
Uffe wrote: mackruss wrote: Can you explain more about WOT i see it appearing on the forums but don't understand the gist of it. WOT = wide open throttle. Pedal to the metal... you know ![]() That's the only way i know how to drive her so i should be fine ![]() Thanks for clarifying, thought it had something to do with the turbo ![]() but then i'm only a " newbie" learning.. |
Author: | tigafila [ Thu Oct 09, 2008 10:49 pm ] |
Post subject: | |
I have the same problem with my wife's '05. It's had 2 turbos, map sensor, actuator, and computer replaced under warranty and we still get the same P0234 overboost code. I'm kind of at wits end with it and don't know what to do next. the dealer has given up. I'm real interested in any advice or what you find with yours. Tia, Tigafila |
Author: | 05infernoCRDL [ Thu Oct 09, 2008 11:57 pm ] |
Post subject: | |
an after thought to my earlier post.... what about the boost selenoid filter? check that... it is behind the airbox a tiny little thing.. maybe that is clogged |
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