How to diagnose a boost leak

135i · 03-23-2012, 08:48 AM

Last night following a local car meet I did some runs against a mustang 5.0 and a bolt on C6 vette. During the course of the runs I got and got a cel and experienced a loss of power under full boost.

I got a "P30FF" code if I am remembering correctly.

How does one with limited wrenching ability go about finding the leak? The cars great under most driving conditions, I only get this code when going all out. Diverter valves gone bad? CAI?

Thanks for the help!

enrita · 03-23-2012, 08:55 AM

are you running the V400 maps? if yes go V401.
Otherwise just check all FMIC connections, charge pipe, dvs etc.

135i · 03-23-2012, 08:59 AM

Quote:

Originally Posted by enrita

are you running the V400 maps? if yes go V401.
Otherwise just check all FMIC connections, charge pipe, dvs etc.

Yessir V400.

Thanks Enrita. I thought it was a hardware issue based on the code but I guess it may be software related

E90SoFlo · 03-23-2012, 09:13 AM

It might be hardware, check all connections if the problem persist.

03-23-2012, 08:48 AM	#1
135i Cobb Stage 2+/ICarbon/HPF/Stett 40 Rep 488 Posts Drives: E92 335i 6MT Join Date: Aug 2007 Location: Deep in the Heart iTrader: (0)	How to diagnose a boost leak Last night following a local car meet I did some runs against a mustang 5.0 and a bolt on C6 vette. During the course of the runs I got and got a cel and experienced a loss of power under full boost. I got a "P30FF" code if I am remembering correctly. How does one with limited wrenching ability go about finding the leak? The cars great under most driving conditions, I only get this code when going all out. Diverter valves gone bad? CAI? Thanks for the help!
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03-23-2012, 08:55 AM	#2
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	are you running the V400 maps? if yes go V401. Otherwise just check all FMIC connections, charge pipe, dvs etc. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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03-23-2012, 09:13 AM	#4
E90SoFlo Banned 196 Rep 2,669 Posts Drives: E90 335i Join Date: Jun 2011 Location: Naples, FL iTrader: (9)	It might be hardware, check all connections if the problem persist.
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