swapped the o2 sensor

[BavarianBimmer]

Do you have an chipped ECU ?
try something with a ECU swap instead buying an ECU
Do you have the 153 or the 172 ?

( All E30 after 1986 have motronic except the M10B18)

[Erick]

My ECU is the 173. It's not chipped

Edit: the engine should be colder now.... I'm going to crank it up to see if it happens again.

[rs4pro3]

There are more sources for vacume leaks then just the intake boot. Just buy my 2.7i and be done with it.
Sounds like a vacume leak to me.

[Erick]

Hey Ely, my offer stands. Unfortunetly right now I cant offer much more. I'd love to get my hands on that engine. What kills it is the drive. Although I definetly wouldnt mind and would love to make the trip, it's a good $$$ being spent.

[James Crivellone]

Speed Reference Sensor, betting on it, My car did the EXACT same thing until I died on the freeway and replaced it, when it got hot it would act up, causing the engine to stumble/die randomly


without a signal the engine cannot rev, then again my AFM was also bad lol

[Erick]

Quick thing. I took off the whole intake part of the car and I just noticed my AFM isnt exatcly round when going in the intake tube..... it gets flat on one side just a bit where it meets the intake boot.

Maybe it could be it..... but it still doesnt explain today's event.

[AngelsToy]

in my honest opinion, try messing with the AFM. my car was doing the same thing until i took the intake box/AFM out, poped the black box of the AFM open and started analizing.. figured out how to adjust it. put everything back together but didn't glue the box back together yet and threw it back into my car.. i read up on it and the tighter you make the spring coil the more air goes into your air/fuel mixture (lean) and the looser it is the less. (rich).. and since my shit was pulling the "almost stall" thing i went for a richer mixture.. basicly what i did was marked the original point of where it was set with a marker pen and loosend it up till the coil/sproket actualy started moving the needle along the electric grid. then i tightend it till it JUST had some tention on the needle so it was at a 0 and wasn't just wobbling crazy.. this was about 1/8 of the circle. i think.... mine had 500 posted a bunch of times around the sproket. basicly i went a whole one of those lengths.. i drove it and then changed it a little tighter (2 notches) drove it and repeated untill i was back at the original point and the best adjustment i found was 2 notches looser than the original. my whole thing was a trial and error. maybe try that. hope it works for ya. did for me.

[Erick]

cool I'll try it out.... once I can fix the brake caliper my dad fucked up while I was doing the brake job in my car :x :roll:

Where in FL are you anyways?

[EVOIIIM3]

cool I'll try it out.... once I can fix the brake caliper my dad fucked up while I was doing the brake job in my car :x :roll:

Where in FL are you anyways?

DO NOT MESS WITH THE AFM!!!!!!! You need a Wide Band O2 to adjust any A/F.

THe AFM is non adjustable except the CO bypass and even that has a tamper proof plug on it. Either the AFM is bad, of you have another problem.

Messing with the AFM will just create more problems for you.

[Erick]

Hmmm I see. Thanks for the warning. I'll see if I can get my father's AFM to put it in.

I took a look at the AFM when I was changing air filters in my car and I noticed that it was really dirty inside with some sort of grease. Is that supposed to be that dirty? I'll see if I can snap some pics.

[AdamF 88iS]

Hmmm I see. Thanks for the warning. I'll see if I can get my father's AFM to put it in.

I took a look at the AFM when I was changing air filters in my car and I noticed that it was really dirty inside with some sort of grease. Is that supposed to be that dirty? I'll see if I can snap some pics.

Normal for M20s. Not super good, but normal. Thats oil that gets shot up the intake from the breather hose.

[EVOIIIM3]

Hmmm I see. Thanks for the warning. I'll see if I can get my father's AFM to put it in.

I took a look at the AFM when I was changing air filters in my car and I noticed that it was really dirty inside with some sort of grease. Is that supposed to be that dirty? I'll see if I can snap some pics.

Spray some intake cleaner in it to get out the gunk, if there is to much and it affects the movement of the AFM that will create problems.

[AngelsToy]

hmm.. i changed the settings of my AFM after reading an artical about "tuning" the airflow meter.. after i adjusted it the way i explained above it's been running like 10 times better.. should i change it back and go back to my bogging days? :roll:

this is the artical i read.. http://www.unofficialbmw.com/all/mot...justments.html except i didn't do any of the o2 sensor stuff, i just made minute adjustments untill my car ran the best... :roll:

[EVOIIIM3]

hmm.. i changed the settings of my AFM after reading an artical about "tuning" the airflow meter.. after i adjusted it the way i explained above it's been running like 10 times better.. should i change it back and go back to my bogging days? :roll:

this is the artical i read.. http://www.unofficialbmw.com/all/mot...justments.html except i didn't do any of the o2 sensor stuff, i just made minute adjustments untill my car ran the best... :roll:

Well, you should have found out why it was running so badly first. Just throwing in more fuel doesn't solve the problem, you just bandaided it. What if you had a fuel problem? Now you just threw in more fuel, but you pump may be going out.

Just because it works, doesn't mean it's really better. All you did was just add more fuel. So can you now be running to rich? What happens now off throttle? You go LEAN due to the door closing easier now.

Try to understand what you are messing with before you mess with it.

For the record, that "other" screw is the CO screw, that is where you can help set the mixture. But you NEED a wide band O2 to do it properly!

[AngelsToy]

it happend after i changed my fuel line because i found a leak in it. BUT when i changed it i didn't buy enuf line so i had to reroute the return line about 1 foot shorter. i don't know why that would cause it to do that, my only guess would be it was getting backed up.. honestly your right, i probably shouldn't have jumped into changing things i don't completely know about, i don't think i will be doing that in the future but it was kind of an emergency and i had no cash to get it worked on. the car is running very good now though, hopefully it was beginers luck :]

the pump is good, had that replaced after getting stuck in virginia on the way back from a trip up and down the east coast (US).. (that sucked)

thanks for the warning. i will definatly have a mechanic checkout my fuel system in a few paychecks, after bills and such. (i hate bills! :evil: )