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      02-20-2013, 11:52 AM   #6967
Ænema
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Drives: BMW
Join Date: Aug 2012
Location: Arizona Bay

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Quote:
Originally Posted by Tag View Post
Hey guys, looking for some insight. I installed Cobb running Stage 1 Sport and have been running it for nearly two months without issue. I really haven't gone WOT or hard on the car at all since I still have my winter tires on and it's too cold for spirited driving anyway. I've checked and the ECU shows no error codes etc. A few days ago I noticed that I didn't hear my Low Pressure Fuel Pump priming the car as it always did when I unlocked it. This has been going on for the past three days. Also, my car takes a tad longer to start unlike before where it was instant. I don't believe this is the HPFP as I've had that issue on my previous car before and this is nothing like that. For whatever reason my LPFP simply isn't priming the fuel system as it's suppose to.

What causes me to think this is something to do with the Cobb tune is when I initially installed the tune the LPFP ran for 10m straight. It really freaked me out but I couldn't stop the update in fear that I would brick the ECU. Now I'm wondering if that initially stressed the LPFP and is now on its last legs. After starting the car today I felt some slight hesitation while idling for about 1m, afterwards it warmed up and drove fine. There also doesn't seem to be any loss in power.

Again, if anyone has any insight into this it would be appreciated. Seriously thinking of ditching Cobb.
No, you're fine. Depending on how long the vehicle has been sitting the fuel system will lose pressure but it will not prime itself. I think there's a TSIB out for it now where the stealership will flash the DME to fix this, however i think the Cobb flash will revert it back to the old logic. Fortunately, It's not hurting anything.
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