Which m20 motor is this??

[slo325i]

I believe I have the manifold from the b25i manifold as well.

Yea... I think I'll drive slowly for now and later when I have more time/money, I'll swap in the proper motor.

[rThor432]

rThor-

I see what you are getting at, but I believe the '87 325i should use the smaller plug, 88-up I and s-etta wiring looks similar.

Nah I was talking about the plug for the idle control valve, which should be the same 3-pin for all of the models. Just the length of wire and where it locates itself is the difference I'm thinking about.

[SpecM]

I do have a '89 325i ICV in the garage. Do you think it would hook up with the '89 325i throttle body?

yea, but you will need to use the b25i TB and manifold on the eta head

swapping harnesses is too much pain, just dont use the upper quarter of the tach

[slo325i]

What does the car idle like ? As far as i can tell there is no icv at all, that's fucked.

The car idles perfect when it's warm. It's when it's cold, where the problem is. But like after 30 seconds of holding the throttle open, it idles fine.

I do have a '89 325i ICV in the garage. Do you think it would hook up with the '89 325i throttle body?

[slo325i]

to solve everything you should put the right motor back in it. your car came with a 2.5 i motor and the guy put the wrong motor in it.
you also can not change the computer cause the wiring harness is different.
if you wanted to fix this right without changing the motor you could use the intake, cam, and valve springs from an i motor and you'd have a 2.7L i motor might get a lil extra power out of it

Changing motors would be a challenge for me right now. Would it be easier to just swap harnesses?? I know a place where I could locate one.

[Adrian_Visser]

What does the car idle like ? As far as i can tell there is no icv at all, that's fucked.

[Spinning Tires]

to solve everything you should put the right motor back in it. your car came with a 2.5 i motor and the guy put the wrong motor in it.
you also can not change the computer cause the wiring harness is different.
if you wanted to fix this right without changing the motor you could use the intake, cam, and valve springs from an i motor and you'd have a 2.7L i motor might get a lil extra power out of it

[slo325i]

One question, should I just get an ecu for a early eta motor?? Would this solve everything? Shouldn't it be just plug and play??

[SpecM]

hmm... DME #153 is an "i" unit, and the electronics match, but that manifold and TB are early eta for sure, NOT s-eta.

and no ICV... hehe bet that thing idles nice in the cold

get a real "i" engine for that thing, and don't rev it past 5500 in the meantime!

[slo325i]

ECU#'s:

Bosch 0261200153
Motronic

This is what the cover said top of the glove box. THere was another computer looking unit under the steering wheel as well.

The numbers printed on that unit said: Bosch 0265103004. I dunno which number will help.

Also, please don't forget that the fact this motor didn't come with the outlet for an oil cooler. I have no idea if this info will help either

Lastly, where is the head casting number located? I can look down there once it gets bright outside.

THanks for all this guys. I really appreciate it

[SamE30e]

My 87' had the smaller D shaped diag plug.

[napabavarian]

Looks like a ETA.

Could it be a SETA?

I just looked at my seta and it has small runners but does not have the hose going directly into the manifold just foreward of the throttle body, so the manifold looks like an early eta.

[napabavarian]

rThor-

I see what you are getting at, but I believe the '87 325i should use the smaller plug, 88-up I and s-etta wiring looks similar.

[SamE30e]

Looks like a ETA.

Could it be a SETA?

[napabavarian]

He says that the motor is from '86, and the car is an '87. Super ETAs came in '88.

He says that the po said it was an '86, but based on the pictures the PO was sloppy, so I'll take that with a grain of salt and recheck everything.

I see what looks like an early etta intake manifold and 88+ wiring, look at the plug bolted to the front left of the manifold. If the installer was using whatever was lying around to make this run there is no telling what is what without looking at each individual piece, I'd like to know what ECU it has.