[lukemcmullen45]

SOLVED! I just flashed my 07 335i with MHD Stage 2. As soon as the flash finished i waited the 30 seconds and turned off the ignition. I started the car and right away it started revving up and I got an engine malfunction.

Codes reading are
29F1 - DME; Fuel Pressure, plausibility
2FA3 - DME; No Coding

I heard 29F1 can be high pressure fuel pump, luckily I have a recall still open for that. Would the flash cause the high pressure fuel pump to fail right away? What should I do? If it helps I have cold start noise reduction turned on (scared me at first lol)

[slowgan]

I noticed my car starting weird with cold start reduction on. Try turning it off then flash it and see if it happens again.

[lukemcmullen45]

Originally Posted by slowgan

I noticed my car starting weird with cold start reduction on. Try turning it off then flash it and see if it happens again.

Will do

[lukemcmullen45]

So I just reflashed stage 2 with the cold start noise reduction turned OFF. It still acted as if it was on, and I got the 29F1 code once again. I’m going to flash back to stock and see if it comes back.

[Bimmer_Engineer]

Did you reset your throttle adaptation? It has to be done properly or it behaves the way you described...

[alpnwss]

I've seen a couple people have issues with cold start noise reduction. Makes me wary about doing so. Report back please!

[lukemcmullen45]

Problem solved! It was NOT the cold start noise reduction. I was being stupid and at the end of the flash, I waited 30 seconds and then turned off the ignition, and then starting, instead of turning off the ignition and THEN waiting 30 seconds. Whoops...

[Saif2018]

Originally Posted by lukemcmullen45

Problem solved! It was NOT the cold start noise reduction. I was being stupid and at the end of the flash, I waited 30 seconds and then turned off the ignition, and then starting, instead of turning off the ignition and THEN waiting 30 seconds. Whoops...

lol, you have to remember to turn ignition off, wait 30 seconds then turn the car back on. This is for every flash.

The no coding issue can be fixed by clearing codes typically.

[Saif2018]

Originally Posted by alpnwss

I've seen a couple people have issues with cold start noise reduction. Makes me wary about doing so. Report back please!

Apparently cold start noise reduction isn't supposed to make any difference to the running of the car, but mine runs better with it on, so I left it on. Also increased idle rpm to 700rpm and it seems to idle smoother too.

[E92aram]

Did you by any chance try the cold start shut off? Because my car didnt accept it... it kept shutting my car off and throwing engine malfunction. So that might be the case

[lukemcmullen45]

Originally Posted by E92aram

Did you by any chance try the cold start shut off? Because my car didnt accept it... it kept shutting my car off and throwing engine malfunction. So that might be the case

I ended up leaving it off just to be safe. I have Downpipes and a muffler delete so it’s pretty loud on a cold start but my neighbors will live

[E92aram]

Originally Posted by lukemcmullen45

I ended up leaving it off just to be safe. I have Downpipes and a muffler delete so it’s pretty loud on a cold start but my neighbors will live

I guess it only happens when there isnt backpressure when i had my straightpipe it did that but with just a catless downpipe and performance exhaust it doesnt

[Saif2018]

Originally Posted by E92aram

Did you by any chance try the cold start shut off? Because my car didnt accept it... it kept shutting my car off and throwing engine malfunction. So that might be the case

I did, didn't shut my car off but took longer to warm up, ran better with it on.