[spooned_n55]

Hi guys,

I have recently been having cold start issues with my '11 n55. When the car has been sitting overnight and I go to start it in the morning, it almost immediately dies (rpms go down to ~500), it struggles, then finally surges back to life and the idle fumbles around for a bit. Warm starts are not an issue. Driving feels relatively normal.

I have also noticed an increase in fuel consumption.

Finally threw 2 codes at me:

29DD - Charge air temperature sensor, plausibility, cold start: temperature too low

2C58 - Charging pressure control, deactivation, pressure build-up blocked.

Any insight?

Thanks in advance.

[aaron_]

Boost solenoid or vacuum lines. Replace both. Cheap and easy

Also, do you have cold start noise reduction on through mhd. If so could be that as well

[spooned_n55]

Originally Posted by aaron_

Boost solenoid or vacuum lines. Replace both. Cheap and easy

Also, do you have cold start noise reduction on through mhd. If so could be that as well

I do have MHD but I do not have cold start noise reduction.

I will look into those items. Do you think there is a chance it's the charge air temperature sensor?

[spooned_n55]

UPDATE:

Scanned again and in addition to the 2 active codes posted above - there are 3 Shadow (inactive) codes:

2904 - Charge-air temperature sensor: Multiple Fault
2908 - Charge-air temperature sensor: Multiple Fault
29E6 - Charge-air temperature sensor, cold start: Multiple Fault

Mods are MHD stage 1, Cobb chargepipe, BMS intake.

[jaytes]

Evening All

I wanted to reach out to this thread, if there was a solution. A few days ago I added 5 gallons of e85 fuel (as always) to my car 2011/FBO/PPK Flash/Alpina Tune/JB4 Map 5 and recieved the following codes with an engine malfuction!

29DD
2C58

I thought it was the JB4 not adjusting to the higher fuel so I cleared the codes and switch to Map 0 from Map5 and back. The car was running great for the past couple days and then today I went to start the car (cold sart) and recieved the same message and codes.

Was there a resolution to this? replacing the boost solenoid and vaccuum lines, I also read somewhere that it might be a Vanos..

[N55lif3]

Originally Posted by jaytes

Evening All

I wanted to reach out to this thread, if there was a solution. A few days ago I added 5 gallons of e85 fuel (as always) to my car 2011/FBO/PPK Flash/Alpina Tune/JB4 Map 5 and recieved the following codes with an engine malfuction!

29DD
2C58

I thought it was the JB4 not adjusting to the higher fuel so I cleared the codes and switch to Map 0 from Map5 and back. The car was running great for the past couple days and then today I went to start the car (cold sart) and recieved the same message and codes.

Was there a resolution to this? replacing the boost solenoid and vaccuum lines, I also read somewhere that it might be a Vanos..

I have recently been stalling only on cold starts but besides that everything seems to be fine. I notice that its only with I am on my E30 blend. I recently found out that one of my chargepipes slipped off a clamp when I saw that I was not hitting target boost. After I fixed it I have yet to experience a stall on a cold start so far (its been a week). Never had any codes pop up at me.

[jaytes]

Originally Posted by N55lif3

I have recently been stalling only on cold starts but besides that everything seems to be fine. I notice that its only with I am on my E30 blend. I recently found out that one of my chargepipes slipped off a clamp when I saw that I was not hitting target boost. After I fixed it I have yet to experience a stall on a cold start so far (its been a week). Never had any codes pop up at me.

I actually came across a different thread having the same issue and code as me. Found out there was water in sensor connection on the JB4-chargepipe-tmap. I dried it out and clean the pins with a qtip. car started up right away and the engine malfunction disappeared along with the codes!

hope this helps!