A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

overboosting problem

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Old Jun 8, 2004 | 06:01 PM
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Junpeix555's Avatar
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Default overboosting problem

I know it has been posted xx times, but I jus wanted feedback. Is it common or even possible to get slight surging and overboosting after unhooking the battery for a while. Casue i left my car at the shop, and when i got it back, i'm boosting at 15-18 when my chip is programmed to run 12. They did suspension work so i doubt they messed with the motor at all. I have a feeling it might* be the n75 vaule but not 100% sure. Its a 99.5 on the old neuspeed chip. I have got surging before, but it was a vac leak from the n75 to the acc. i checked everything this time but no leaks anywhere, bpv works fine. Therefore wanted to know if our cars ecu takes numbers to adjust boost or something after unhooking the battery. TIA
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Old Jun 8, 2004 | 06:02 PM
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Default btw

no cel
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Old Jun 8, 2004 | 06:04 PM
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check the hoses to the N75...make sure they are not pinched.
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