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Daap1193 Daap1193 is offline
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Car: Bmw 420i Gran Coupe N20, JB4, ER chargepipe -w/m kit
Default N20 420i Wastegate problem - 09-12-2018, 02:21 PM

The car was working fine, when suddenly it lost boost pressure, it start by losing a few psi but now it only reach 4-5 psi in any map. I check the chargepipe and it seem ok no leaks, make a log and WGDC is 0 all the time.
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File Type: csv 2018-09-12 14_04_46.csv (11.6 KB, 59 views)

Last edited by Daap1193; 09-14-2018 at 11:12 AM.. Reason: wrong title, shoud be Jb4 problem
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Daap1193 Daap1193 is offline
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Car: Bmw 420i Gran Coupe N20, JB4, ER chargepipe -w/m kit
Default 09-12-2018, 05:12 PM

Somebody there, I need some help.....
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Herc Herc is offline
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Default 09-13-2018, 07:15 AM

boost leak may come from various places and requires a professional approach. If something wrong with the wastegate again must be seen by a professional
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Daap1193 Daap1193 is offline
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Car: Bmw 420i Gran Coupe N20, JB4, ER chargepipe -w/m kit
Default 09-13-2018, 09:14 AM

Iīll take it to be check by a profesional today and will post the diagnostic. The car was working great before the JB4 hope thats not the problem.
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Daap1193 Daap1193 is offline
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Car: Bmw 420i Gran Coupe N20, JB4, ER chargepipe -w/m kit
Default 09-14-2018, 10:57 AM

Take it today to be check by a profesional tuner, he test for leaks but the car was ok, check the turbo and it was ok no turbo failure, then he dyno the car to check the wastegate, everithing seems to be fine, but boost isnīt constant sometimes it raise up to 12 psi and then drop again, no mater what map you are in the car isnīt working fine, the last resource was to put some race gas and check if was an octane problem, it wasnīt. The next step is to disconnect the JB4 and check if the car works fine. It wasīt posible in the garage because the car was too hot to try get the FF wires out. So today I waste 100 Usd on the shop to realize the car was good and now i have to take the JB4 out and test the car again. Seems that JB4 no was as good as I expected, support ? at this time CERO, I have send multiple emails, no help, this forum, just tell me to take it to be check by profesionals, that tell me the car is in shape and posible to be due to Jb4 Fail. Really disappointed.
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Herc Herc is offline
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Default 09-15-2018, 07:32 AM

was the box bought brand new or used?
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Daap1193 Daap1193 is offline
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Default 09-15-2018, 02:23 PM

Brand New
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Herc Herc is offline
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Default 09-23-2018, 01:06 AM

Well then the obvious solution is to contact the seller. and verify all pins are place on the correct DABs. If there is friend with same engine and same box you could test that one.
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