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Code 2632-000 after Tune
Got a Stage 1 tune on one of my CDI's. Had a good experience so got it done on the other. After the tune I experienced "kangarooing" upon hard acceleration....a judder or oscillating hesitancy. The code that was thrown and keeps coming back is 2632-008 "Check system charge pressure." What I have not done yet is go back to the stock tune and see if it still throws the same code.
Either way, what problems cause that code to be thrown? I think the turbo actuator is a possibility from what I read. The tuner won't be able to provide any definitive guidance until I am able to record live data of boost and rail pressure. Thanks.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife Last edited by shertex; 11-11-2020 at 05:02 PM. |
#2
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Make sure you don't have any weak areas on the charge piping/hose from discharge of turbo to intake manifold. Also make sure inter cooler does not have a weak spot that could leak during boost.
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Jim |
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Agreed if you have a pressure loss from turbo thru intercooler to intake manifold it will throw CEL and limp mode, one of my 642s had this (operator error during reassembly) and it was worse than a 240D.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#4
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The charge pressure is too high maybe your veins are binding.
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#5
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Yep that’s a possibility too. The VNT vanes can get carboned up.
The VNT works backwards of what you might think. The vanes allow a path around the exhaust impeller when open. This reduces the flow to the impeller, so the rotor turns slower, thus reducing the intake pressure. If the vanes stick shut, then it can’t modulate the intake pressure, and the computer throws the flag. I had that problem too and it did manifest itself as a jerky acceleration from a red light. OM642 VNT Turbo actuator issues On a 642 but I think most of the systems are similar to the 648. But I will say the jammed VNT did flag a stuck actuator because there is feedback to the computer when the servo tries to move the vanes and can’t. Easy test, unclip the arm from the servo and try to move the vanes and see if they are sticky. Don’t try this with the servo hooked up or it will damage the gears. Or if you have a Xentry go into engine control, guided tests, and do the actuator test and watch it go back and forth.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#6
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The Foxwell scanner also preforms that test and a live spool up test which will likely identify an issue.
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#7
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I will add that the car drives beautifully otherwise....the kangarooing is only noticeable at full throttle.
Also, I don't know for a fact that the tune triggered the throwing of the code. It could have been there for who knows how long without any adverse effect on performance. EDIT: I deleted the code, drove it hard for a while, experienced the same kangarooing upon hard acceleration, but the code did not come back. Hmmm....
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife Last edited by shertex; 11-13-2020 at 01:55 PM. |
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To close the loop on this....One of the things the tuner noted originally was that there was some sort of checksum error in the stock file, an error which he thought he had corrected in the tune. But, when my issue persisted, he decided to create the file using a different program, one that he doesn't ordinarily use. I loaded the file this morning and, VOILA!, no more kangarooing. He's still a bit mystified as to exactly what the problem was with the first file. But glad he was able to solve the problem without my having to take all sorts of live readings.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#9
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I have experienced the same thing you did.
Curious who your tuner is. It is almost like you were reading my mails. My stage 1 works great now but i decided if some is good, more must be better. Went to stage 2 and the pulsing is back. Same code as you. Tuner is at a loss as am I. My guess is there is a combination of data that causes the ecu to rapidly fluctuate outputs and the different file without the checksum was a work around. |
#10
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Quote:
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
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