P0174, random stumbling idle,

[Nateboosted800]

2010 135i, 130k, vsrf charge pipe, completely stock other than that. Car runs and drives just fine other than the Random stumble when cold.

After so many miles this p0174 will come back on after i delete it
I cleaned the map sensors no change
No hissing noise
No visible vacuum leaks

Possible injector issue theyre still index 7?
Could it be a o2 sensor since its just one bank thats lean?

[Petro135]

Unfortunately it could be alot of things. Before you go replacing parts you should have an indy mech find
the issue. Could be o2 sensor, could be vacuum leak, could be fuel pump, could be injectors. Or even more. Or something real simple.
Do a log and see how your ltft's are. Then do a little research and see if they are in normal range.

[Tuxedo]

Originally Posted by Nateboosted800

2010 135i, 130k, vsrf charge pipe, completely stock other than that. Car runs and drives just fine other than the Random stumble when cold.

After so many miles this p0174 will come back on after i delete it
I cleaned the map sensors no change
No hissing noise
No visible vacuum leaks

Possible injector issue theyre still index 7?
Could it be a o2 sensor since its just one bank thats lean?

I've had 2 128i N51 with this issue. Short answer is it's a software issue of some kind
SIB12-15-14 there might be a newer update

Aging coils and plugs can enhance the issue.


https://www.scribd.com/document/1519...T-Stalling-TSB

[Nateboosted800]

Originally Posted by Petro135

Unfortunately it could be alot of things. Before you go replacing parts you should have an indy mech find
the issue. Could be o2 sensor, could be vacuum leak, could be fuel pump, could be injectors. Or even more. Or something real simple.
Do a log and see how your ltft's are. Then do a little research and see if they are in normal range.

Theyre all in the normal range

[nazali]

is that with an OBDii or ista ?
any BMW codes

running lean ? hmmm, I've found that cleaning the MAF doesn't always do it, I'd change that out, pull the plugs and check them

if more than 50k on thoes plugs change them, use OEM's

[Nateboosted800]

Originally Posted by nazali

is that with an OBDii or ista ?
any BMW codes

running lean ? hmmm, I've found that cleaning the MAF doesn't always do it, I'd change that out, pull the plugs and check them

if more than 50k on thoes plugs change them, use OEM's

P0174 code
I data logged with the jb4 and the lp and hp fall within the range

[nazali]

I use ista, reingold,inpa, BMW software, never lets me down and gives me all I need. When I get similar issues I rely on that and it usually pulls me out of the soup. I don't know enough about JB4what it can and can't do diagnostics wise.

just IMHO, without more info from Ista or other codes, that maybe only ista will see, I don't know, hence why I asked

Originally Posted by Nateboosted800

P0174 code
I data logged with the jb4 and the lp and hp fall within the range