1st Gen R53 Cooper S Most liked posts in thread: DT BPV = P0171 :(

It's funny how many of us bought into the idea that the aftermarket silicone IC boots were better. I've tried them too, only to go back to the OEM.

 

P0171 is a too lean code. The BPV doesn't cause a code unless you get a vacuum leak from miss install. You have reset the codes and the ECU? In OH you should not seen that code normally. i see it from time to time in cars with and without BPV when we take trips into the mountains. i might take it too a shop to see it there are any hidden codes inside they system. give me a call if you need help.

Chad
Detroit Tuned.
586.792.6464

 

Read all the above post as the problem could be many things not one specific thing. Vac or boost leaks, and even old dirty fuel filters.

The problem is not the Detroit Tuned BPV.

 

I did, and I have done them all Dave. The light came back, and I am at wits end. I don't know what else it could be, hoping other people had this code pop up not relating to the BPV and solved it.

 

Buy any chance do you have ALTA IC boots?

 

Ok take them off and put a set of OEM flexible rubber ones on. Reset everything and drive it for a while.

 

ALTA Red IC boots

*The one exception to Red makes everything faster. Under load the leak and you loose boots.

Had them, installed them, had a problem, put them in the trash, OEM rubber boots ever since, no problems.

End result: They ALTA work but don't, just like everything else ALTA. :devil:

 

ALTA: Almost Lasts To Autozone

 

Have you cleared the code with a scanner? If not, maybe you can swing by autozone and ask them real nicely if the will. I don't think they're supposed to.

Other than that I have no ideas. My ses light is still on from my early november install...but not an 0171

 

Is it possible that the stiffer spring in the DT BPV is causing too much boost pressure to build during cruising when it is not needed, and thus causing a lean condition from too much air? But then again, I would think the computer should adjust. I also think the SC should be pulling very little power - spinning freely (1/3 HP, i.e. practically no boost) unless accelerating.

Just wondering. --Russ

 

No, cause you could take the BPV out of the system totally and you will still never get a code. just a hit in MPG. we have several people that Autocross there cars and they zip tie it shut to have full boost asap. they drive it to and from the events with out any problems or codes. so i don't think that the code is being caused by the BPV at all. we did a lot of testing on it back in 2004 when we came up with the fix/mod and have not had any problems up to this point and have not changed the design of it over the years. i still make each one by hand myself. we have made about 1400 BPV to date and we get about 6 calls a year with problems and it's always something else that is causing it, but we try to help the best we can over the phone.

Chad
Detroit Tuned

 

I have the DT BPV and have had this code as mentioned above while driving in the mountains.
I would always just reset it and keep going. Last year while at MITM's I lost all boost going up
I-70. I traced it back to leaky IC boost, so new boots on and so far no more code.
In other words your boots may be leaking(?)

 

ah yes P0171...i had that code before...it was the fuel filter...it was gunked up so it wasnt getting enough fuel when i was putting my foot into it on the mountains...got the filter replaced and fine ever since

 

I'm not super familiar with R53s but if it was one of my other vehicles I'd check for a vaccuum leak after the throttle body or like YellowBritishRocket said fuel delivery.

 

I know I am reviving a long dead thread, but i was curious if you ever found the route of the issue. My car has been doing this for years now, but only after running for a few hour or spirited driving. Once it cools back to outside them, I can usually run well again.

 

On my 03 MCS I used to get a P0171 on the highway every 6 months or so after I did the VGS mod. Might want to check to see if this mod was done to your car.
I could not find anything on MA about the VGS Mod but here is a link on different site:
Drivetrain :: Operation Vacuum Gain System (VGS) - North American Motoring