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05-05-2016, 01:25 AM | #1 |
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Installed jb4 back into car now car won't run
2011 n55 fbo 135i Cobb backend flash jb4. So I unplugged my jb4 and uninstalled Cobb for emissions. Reinstalled Cobb today. Car started and ran fine. Hooked up jb4 and tried starting car and it started and died. Cc-id 29 in dash and a million dtc codes on Cobb. Cleared and tried again all the codes came back and still didn't run. I found the boost solenoid plug was broken and I think it may have shorted out. Will the boost solenoid (pressure converter) keep the car from running? The dtc codes seem to all point to a bad communication with the wiring harness and dme. I dk if it's the boost solenoid or a fuse? Any ideas or help would be amazing. Thanks
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05-05-2016, 11:43 PM | #4 |
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The OP is getting help on n54tech.
Basically, he didn't disconnect his battery before reinstalling the jb4 and shorted something out. Best of luck and keep us posted. |
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05-05-2016, 11:45 PM | #5 |
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Yea sorry for duplicate threads I wasn't getting anywhere there until today. I had to do the ground trace bypass to get car running. I damaged the dme. Battery disconnected or not the clip broke and the wires were touching regardless. It's still not running out of limp mode so I have more things to figure out. I'll update as things progress.
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08-16-2016, 04:26 PM | #7 |
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When I had issues when I install jb4 the first time, I freaked out when it ran into limp mode and got a bunch of errors. I uninstalled jb4 and took it to my mechanic to have a look. In the end it was a$2 fuse that was out causing all the problems, which ended up costing over $200 to diagnose. So check every fuse first.
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