So I stalled at a light because engine idling was up & down put it in neutral and started back up then drove to work ~ lunchtime it threw a code mass airflow sensor so I did some research and maybe it’s time for solenoid / actuator? Or Throttle body or all 3 I have all new plugs and coil packs already any recommendations? It seems like it wants to cut out when come to a light and then it wants to go go go ?
How many miles has it been sense you had the intake walnut blasted? That is also a sign of carbon build up. It may also be the MAS.
Update so sensor changed rock auto $67 and changed and seems so far so good and code clear and no erratic idling and take offs are Thunderbirds Go!
Tuesday next week I’m doing the two VVT solenoids because I threw another code again and everything else is good and I’m thinking that 119k it’s time to pull them out and look too see if gunked up? She’s running super but idle is up and down sometimes not all the time~~
What year is your Mini? If it is a gen2 S they need the intake walnut blasted about every 40k. If the valves are getting build up it will start by having idle issues once it gets bad enough it will have a valve stick then it’s bad news
I’m having a recurring 2B5C (P115C) code. Trying to sort out between MAF sensor, throttle body, vacuum leak, or carbon on valves (44 K miles) at the moment. No other codes. Only threw a CEL (P115C) once, but the pending 2B5C comes up more and more often when I scan for pending codes. Runs great, steady idle, and better than usual mpg, (although there may be other reasons for that last item).
Will first try a new MAF sensor, then a new TB, then pull the intake manifold off and get the borescope out to look at the intake valves**, then maybe get an inexpensive smoke machine to see if there’s an occult leak or crack that has escaped my notice so far*. Hopefully it will get sorted out well before I get very far down that list. Other suggestions are welcome. *have already replaced the cracked plastic hose from the filter box to the turbo intake as well as the noisemaker delete and the resonator delete and BSH pvc hose plug and OCC and new oem diverter valve and all those hoses and connections are good) **has had oil changes every 5K forever and seafoam treatment through the vacuum hose to the intake manifold before each of the last 3 oil changes, and OCC last 15K so intake valves probably aren’t too bad.
If you have been doing the seafoam treatment then your valves may not be too bad. The long hard plastic tube that goes from the intake to the turbo get cracks from age maybe check that also.
Do you mean from the intercooler exit towards the throttle body? I already replaced the one from the intake filter housing to the turbo inlet. Do you take off the lock bridge to get to that (big U shaped metal part that goes over it in the photo)?
Might just run a borescope down that tube since it’d be less bother to do. Sorry, Homazur, I seem to be hijacking this thread.
By chance, do you have one of those so called "performance" air filters that gets re-oiled after a filter washing? Over saturating the air filter with the oil can cause issues with the proper operation of the mass airflow sensor...