S50 running issues

[328ijunkie]

^Depending on what year it came from it is different. Where is your IAT? Under the manifold or by the BB nipple?

[Danny]

^Depending on what year it came from it is different. Where is your IAT? Under the manifold or by the BB nipple?

It is by the BB nipple, the previous one was under the intake. Is it a different IAT?

[328ijunkie]

no iat is the same but the snap in connector is different:

vs

[Danny]

You have part numbers? I used one for a 95 M3 as I assumed they were the same.

[328ijunkie]

^Not at all. Call my shop number and ill walk you through what you can do if youre near the car.

oh and ill need you to mail me a beer when i fix it for you

:P

[Danny]

Haha I probably will. I just found the part numbers.

Early: 11-61-1-730-265

Later: 11-61-1-738-629

If anyone is curious. One is coming to me today.

[328ijunkie]

You can fix the late model one to work. You dont need to replace it.

[328ijunkie]

Figure it out? Anxiously wondering if i win ;) lol

[Danny]

Well I'm at work currently, I can't work on the car until I get home lol.

[328ijunkie]

lame :(

[Danny]

Okay, update: Dave's piece helped a bit but not by much. Still misses really badly at low rpms and hunts a bit when idling. Not much of a change between the mad being unplugged and being plugged in.

Fred, the fuel pump connector isn't very tight and may have an issue. I will replace that Monday. Going to grab a spare maf from an awesome friend of mine and swap the good maf tomorrow. Will report back results.

[ak-]

Hi Schillingster.

Again, m20 related, but I have dealt with a similar issue for over a month.
Start up, very low idle trying to correct itself.
Have to gas it or it will turn off.
Runs fine though at operating temp.
Sometimes shuts off when cruising if I let the idle drop when I press the clutch.
Happens on all start ups 80% of the time.

Just fixed this tonight and it turned out being the coolant temperature sensor.
Considering mine was bad, the ecu doesn't know the coolant/car is cold and wouldn't richen up the mixture to keep the car on.

AFR gauge at idle was 17-18 and struggling to stay idled untill warmed up.
Now, with the problem fixed, it starts cold and maintains 12-13 until warm and stoich with a healthy idle every time.

So yeah, my issue = coolant temp sensor (ecu)

[Danny]

Thanks Adbu.

To update again, I let it get to temp with no change.

[ak-]

Yeah. Goodluck man.
When I said it ran fine at operating temp I meant under load.
At a stop light it would do the same annoying thing.

[Danny]

Changed the maf, no difference. Tried with the tps unplugged and it running a bit better, doesn't miss as much. Going to do a compression test on Monday. Maybe have to look into getting another m50 intake.