Boost lost
12-09-2018, 03:36 AM
#1
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CLS63
Boost lost
Hi all. New here. So i am having am issue with my CLS63.
i picked it up recently p30 pqckage. Bone stock. It made 475whp on conservativr dyno dynamics. Boost would peak at 11-12 and tapper off to 8psi. The performsnce was there. Ran 100-200kmh in 8.1-8.2 consistsntly.
then we loaded a tune. Peak boost went up to 20psi but would tapper off to about 12psi. The performance gain was big. Dropped 100-200 to 7.1 with a lot of spin and a passenger. At 2% incline.
the car did 7-8 strong pulls the boost just disapeared it starts of at 18psi and then drops to 3psi til the end of 4th- 5th gear.
star shows absolutely no codes. I ve chs ged the solenoid and vacuum pump. Made zero dofference. I ve also smoke tested the system found no leaks. I ve flashed the ecu back to stock file.made no difference. At this point i dont know what else to do.
any help will be hugely appreciated.
i picked it up recently p30 pqckage. Bone stock. It made 475whp on conservativr dyno dynamics. Boost would peak at 11-12 and tapper off to 8psi. The performsnce was there. Ran 100-200kmh in 8.1-8.2 consistsntly.
then we loaded a tune. Peak boost went up to 20psi but would tapper off to about 12psi. The performance gain was big. Dropped 100-200 to 7.1 with a lot of spin and a passenger. At 2% incline.
the car did 7-8 strong pulls the boost just disapeared it starts of at 18psi and then drops to 3psi til the end of 4th- 5th gear.
star shows absolutely no codes. I ve chs ged the solenoid and vacuum pump. Made zero dofference. I ve also smoke tested the system found no leaks. I ve flashed the ecu back to stock file.made no difference. At this point i dont know what else to do.
any help will be hugely appreciated.
12-09-2018, 10:57 AM
#2
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“then we loaded a tune.”
Contact the company you bought the tune from in the first place. If they are legitimate they will help you out.
Contact the company you bought the tune from in the first place. If they are legitimate they will help you out.
12-09-2018, 12:46 PM
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
Reset your ecu and tcu
the engine is pulling timing perhaps, do you get better performance on the first pull?
the engine is pulling timing perhaps, do you get better performance on the first pull?
12-09-2018, 04:50 PM
#5
Timing will not account for measurable boost loss. Your car is going into some form of limp mode and eliminating boost. I would look into your boost solenoid and the vacuum hoses attached to it going to the turbos
those hoses get brittle and won't stay on especially with a tune
those hoses get brittle and won't stay on especially with a tune
12-09-2018, 04:52 PM
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
Timing will not account for measurable boost loss. Your car is going into some form of limp mode and eliminating boost. I would look into your boost solenoid and the vacuum hoses attached to it going to the turbos
those hoses get brittle and won't stay on especially with a tune
those hoses get brittle and won't stay on especially with a tune
12-09-2018, 05:32 PM
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CLS63
So i did the ecu / tcu reset. When u hold the gas for 15 secs etc etc. It worked. Car made 19psi peak and dropped.down only to 14psi.
iats are fine. Timing is fine. I ve chsnged the solenoid and checked the vscuum hoses.
it drove fine for a bit then i went to check 100-200 and wasnt abale to..boost dropped again..and i wasnt able to reset anymore....
well at least i know now its electronic. I didnt like 3td to 4th shift when we first loaded the tune, when car ran fine, so i m thinking to chsnged trans fluid which i was planning anyway.... i leaning toqards ecu protecting transmission...
iats are fine. Timing is fine. I ve chsnged the solenoid and checked the vscuum hoses.
it drove fine for a bit then i went to check 100-200 and wasnt abale to..boost dropped again..and i wasnt able to reset anymore....
well at least i know now its electronic. I didnt like 3td to 4th shift when we first loaded the tune, when car ran fine, so i m thinking to chsnged trans fluid which i was planning anyway.... i leaning toqards ecu protecting transmission...
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12-09-2018, 07:53 PM
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
So i did the ecu / tcu reset. When u hold the gas for 15 secs etc etc. It worked. Car made 19psi peak and dropped.down only to 14psi.
iats are fine. Timing is fine. I ve chsnged the solenoid and checked the vscuum hoses.
it drove fine for a bit then i went to check 100-200 and wasnt abale to..boost dropped again..and i wasnt able to reset anymore....
well at least i know now its electronic. I didnt like 3td to 4th shift when we first loaded the tune, when car ran fine, so i m thinking to chsnged trans fluid which i was planning anyway.... i leaning toqards ecu protecting transmission...
iats are fine. Timing is fine. I ve chsnged the solenoid and checked the vscuum hoses.
it drove fine for a bit then i went to check 100-200 and wasnt abale to..boost dropped again..and i wasnt able to reset anymore....
well at least i know now its electronic. I didnt like 3td to 4th shift when we first loaded the tune, when car ran fine, so i m thinking to chsnged trans fluid which i was planning anyway.... i leaning toqards ecu protecting transmission...
i think that if you're in s+ mode it should discard any tcu adaptations and let your drive it fiercely
Ah I see what you're saying; when you change the solenoids and hoses the battery was most likely disconnected and therefore you reset the tcu by definition. That's why it drove fine for a while
imagine how many guys are taking m157's to the track without resetting tcu and having less than stellar 1/4 mile and trap times....with and without tunes
Last edited by PeterUbers; 12-09-2018 at 07:58 PM.
12-09-2018, 10:37 PM
#9
01-14-2019, 04:51 AM
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2014 E550 4MATIC TUNED - Turbo Upgraded Stage 3
But i can hear the exhaust sound change. Then, i scan code. It shows "Pending code P0299"
Usually, it happens when i drive aggressively. 50% chance it comes up.
01-14-2019, 11:20 AM
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CLS63
So finally we figured it out!!! Man this took long. And pissed me off a bunch.... in the end it was the 2 sensors at the filters. Removed the sensors from the airboxs and just placed them in the bay. Car ran good for a few runs. Then went back to low boost scenario.
placed the sensors back in their places bit ditched the filter. Car ran like crazy. No issues at all. Other than the feeling that something might fly in the turbos without filters.
placed the filters back but unplugged the sensors. Car runs great. No issues since.
I didnt get a chance to change the sensors. See if they had gone bad.... because the original filters thst the issue came upon were KN in decent shape.
Waiting for new BMC fikters to arrive. See how they do. I ll chsnge out the sensors in the meanwhile.although i m thingking to just tune out those sensors. They are there just to tell u when filters are dirty. And the fsct thst the car goes fine with them unplugged, i ll just tune em out....
car runs sick now. 100-200 came down to 6.8s with a passenger from 8.2s. In nearly identical condotions.
placed the sensors back in their places bit ditched the filter. Car ran like crazy. No issues at all. Other than the feeling that something might fly in the turbos without filters.
placed the filters back but unplugged the sensors. Car runs great. No issues since.
I didnt get a chance to change the sensors. See if they had gone bad.... because the original filters thst the issue came upon were KN in decent shape.
Waiting for new BMC fikters to arrive. See how they do. I ll chsnge out the sensors in the meanwhile.although i m thingking to just tune out those sensors. They are there just to tell u when filters are dirty. And the fsct thst the car goes fine with them unplugged, i ll just tune em out....
car runs sick now. 100-200 came down to 6.8s with a passenger from 8.2s. In nearly identical condotions.
01-14-2019, 12:34 PM
#12
sorry if i'm not understanding. but What sensors are you referring to? and are you saying the filters were to blame? were they clogged? did you have better results with oem filters?
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01-14-2019, 01:01 PM
#14
ahh i see. he could be onto something beneficial. waiting to see if changing them helps. or removing them entirely? are there any risks of me having my tuner tune them out completely? I have aftermarket filters as well
01-14-2019, 01:02 PM
#15
it seems like the filters is fouling the sensors. ive read somewhere this could happen on oiled filters? not sure if yours are oiled. not sure if mine are either. I have the green performance filters
01-16-2019, 05:05 PM
#16
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2014 E550 4MATIC TUNED - Turbo Upgraded Stage 3
So finally we figured it out!!! Man this took long. And pissed me off a bunch.... in the end it was the 2 sensors at the filters. Removed the sensors from the airboxs and just placed them in the bay. Car ran good for a few runs. Then went back to low boost scenario.
placed the sensors back in their places bit ditched the filter. Car ran like crazy. No issues at all. Other than the feeling that something might fly in the turbos without filters.
placed the filters back but unplugged the sensors. Car runs great. No issues since.
I didnt get a chance to change the sensors. See if they had gone bad.... because the original filters thst the issue came upon were KN in decent shape.
Waiting for new BMC fikters to arrive. See how they do. I ll chsnge out the sensors in the meanwhile.although i m thingking to just tune out those sensors. They are there just to tell u when filters are dirty. And the fsct thst the car goes fine with them unplugged, i ll just tune em out....
car runs sick now. 100-200 came down to 6.8s with a passenger from 8.2s. In nearly identical condotions.
placed the sensors back in their places bit ditched the filter. Car ran like crazy. No issues at all. Other than the feeling that something might fly in the turbos without filters.
placed the filters back but unplugged the sensors. Car runs great. No issues since.
I didnt get a chance to change the sensors. See if they had gone bad.... because the original filters thst the issue came upon were KN in decent shape.
Waiting for new BMC fikters to arrive. See how they do. I ll chsnge out the sensors in the meanwhile.although i m thingking to just tune out those sensors. They are there just to tell u when filters are dirty. And the fsct thst the car goes fine with them unplugged, i ll just tune em out....
car runs sick now. 100-200 came down to 6.8s with a passenger from 8.2s. In nearly identical condotions.
so, you are running it without MAP sensors !?!?
I thought that would throw AFR off the chart.
06-19-2021, 10:11 PM
#19
Senior Member
I have had this same issue. Boost will be crazy and then drop and feel as though it's an N/A motor. I tried cleaning the MAP sensors and boost has stayed consistent and felt as though the car should. Prior even under boost it felt sluggish and didn't have power off the line.
