My 333i Swap: The beginning

[chadthestampede]

Nice work on the swap. My brother and I are planning a b35 into a euro 323i E21.

Have you checked your fuel pressure at the rail? Make sure you have pressure within spec. I think you may be on to something with the coolant temp sensors. There are several different sensors. Thermo time switch, ECU coolant temp sensor, temp sending unit, etc. Are your sure that all of these are hooked up properly and also wired back to the harness properly?

Good work as a whole. I am enjoying your thread. Take it easy.

I checked the fuel pressure today, and I'm getting plenty so I think the pump is fine. As far as the temp sensors, I tried switching the one for the ecu (which seems to be the problem one) out with the one from my m20, and it does the same thing: Stalls almost immediately when plugged in, and if unplugged runs for 10-15 seconds and then stalls.

thanks, I'm glad you're enjoying the thread, it's a lot better to have feedback than to be just doing it on my own.

Nice progress. It will all be worth the effort when you drive the car and find out what torque feels like.

About the driveability (or lack there of), have you checked for vacuum leaks? Have you tried plugging that one hose that has the blue thingy on it that is in one of your pics? Aside from any wiring issues, that would be my best interwebz mechanic diagnosis.

I'm pretty sure I don't have any vacuum leaks, all the hoses are hooked up, and the blue one is blocked off since I have nowhere to hook it up.



It has to be wiring, but I have no idea where I went wrong!!

[alpinaclone]

Nice progress. It will all be worth the effort when you drive the car and find out what torque feels like.

About the driveability (or lack there of), have you checked for vacuum leaks? Have you tried plugging that one hose that has the blue thingy on it that is in one of your pics? Aside from any wiring issues, that would be my best interwebz mechanic diagnosis.

[pldlnr]

Nice work on the swap. My brother and I are planning a b35 into a euro 323i E21.

Have you checked your fuel pressure at the rail? Make sure you have pressure within spec. I think you may be on to something with the coolant temp sensors. There are several different sensors. Thermo time switch, ECU coolant temp sensor, temp sending unit, etc. Are your sure that all of these are hooked up properly and also wired back to the harness properly?

Good work as a whole. I am enjoying your thread. Take it easy.

[euroshark]

Haha.

Shit.

I'll see if I can brainstorm and come up with anything for you tomorrow...

[chadthestampede]

Ok, so you have the 533i electronic pieces, but what engine wiring harness did you use? The one from the 533i? If so, you may have an issue with the idle control, since the early motronic used a separate little green box to control all idle functions, whereas the later versions had the idle functions integrated into the ECU.

the harness is the original one from the engine: an 83 733i, and I have the idle control module plugged in as well (the car won't run without it)

[euroshark]

Ok, so you have the 533i electronic pieces, but what engine wiring harness did you use? The one from the 533i? If so, you may have an issue with the idle control, since the early motronic used a separate little green box to control all idle functions, whereas the later versions had the idle functions integrated into the ECU.

[chadthestampede]

One from the M20 probably won't work unless you are running the late Motronic.

What ECU are you using? Are you sure the AFM is correct for that ECU? I'm guessing you should have an 008 ECU and 016 AFM (last three digits of the part numbers). If you mix and match from different Motronic versions you can get similar problems to what you are describing.

yeah, the ecu is an 008 from an 84 533i, and I think the afm is from an 84 533 too, but whatever it's from it's an 016. I had a 535i one on before and it didn't work so well, but this one isn't doing much better.

[euroshark]

One from the M20 probably won't work unless you are running the late Motronic.

What ECU are you using? Are you sure the AFM is correct for that ECU? I'm guessing you should have an 008 ECU and 016 AFM (last three digits of the part numbers). If you mix and match from different Motronic versions you can get similar problems to what you are describing.

[chadthestampede]

Throttle position sensor - is it plugged in? Are you sure it's working? Unplug it and see if anything changes. What ECU are you using?

The engine temp sensor for the ECU is critical. You might try replacing it.

the tps is plugged in, and i tried using a different one off another throttle body that i have and it had no effect.

do you think I could I try a temp sensor from the m20?

[Jean]

Good job so far!!!

[euroshark]

Throttle position sensor - is it plugged in? Are you sure it's working? Unplug it and see if anything changes. What ECU are you using?

The engine temp sensor for the ECU is critical. You might try replacing it.

[chadthestampede]

alright, a new development. If i unplug the temp sensor that goes to the motronic, the motor idle's and doesn't immediately die. It idle's for 15-20 seconds before slowing down and stalling, almost like it's running out of fuel. If i plug the sensor in it immediately stalls.

is there any way to jump out the sensors or something? I really don't care about any except the gauge one, and they're obviously part of the problem.

[euroshark]

The AFMs are quite different, if you need one I might have a spare for you.

[chadthestampede]

Damn, that is a sexy motor mount. :)

Looks good, the runability issue could be anything, I wouldn't suspect the O2 sensor though, it is bypassed when cold

Sure is, YOU can have one too if you contact....oh wait.

Anyway turns out that the *33i's used their own afm, and here I am trying to use one off an 86 535i. :oops:

So when I replace it I guess i'll know if that's the problem...

[Funkmasta]

Damn, that is a sexy motor mount. :)

Looks good, the runability issue could be anything, I wouldn't suspect the O2 sensor though, it is bypassed when cold