M20B27 Running CRAZY Rich With Lopey Idle

[ChubbWubWub]

Okay so I know its been covered somewhat before but it seems like my exact symptoms haven't been. So I recently bought a 1985 325e that had been sitting for over a year after the PO said it had started to misfire. I did a compression test before purchasing it and all checked out perfect. I replaced the following:

Plugs (w/NGK ZGR5A)
Bosch Plug wires
Fuel Filter
Coil
Cap
Rotor
Drained gas tank and put in 89 Octane

*Still need to do all fluid etc. Just wanted to fire her up and see if I could get it to run smoothly, my dad is an auto mechanic so we were gonna do a full service at his shop if we could get it there*

*It is also straight pipped off the cats out the driver side so that contributes to the loudness you hear in the video*

After jumping it, it would not hold an idle so I had to give it minimal gas to keep it going, it was clearly running extremely rich (black smoke/sound) and it also was very lopey like it was cammed. I've basically have seen on r3v that its most likely the AFM, or the Coolant temp senor. But I figured Id post up a thread and include a video to show just to make sure before I go out and buy parts. Thanks in advance.


VIDEO: https://www.youtube.com/watch?v=TSIm40Hp_sA

[Reichart12]

Are you planning on keeping the exhaust like that or would you be building a system eventually?

[ChubbWubWub]

Are you planning on keeping the exhaust like that or would you be building a system eventually?

As long as I don't get pulled over every 5 minutes I'm gonna keep it until I get the extra cash for an actual cat back

[AndrewBird]

Kinda sounds like it isn't running on all cylinders. What do the plugs look like after running a bit?

[dnguyen1963]

^this.

[ChubbWubWub]

Kinda sounds like it isn't running on all cylinders. What do the plugs look like after running a bit?

I will pull the plugs in a few minutes, got bored this morning and pulled the ICV off and cleaned it out with some carb spray, I know this wont fix my problem, but it'll help when its running properly.

BEFORE:

[IMG][/IMG]
[IMG][/IMG]

AFTER:

[IMG][/IMG]
[IMG][/IMG]

[ChubbWubWub]

I did get around to removing the cover of the AFM to do the common rejuvenation of the resistor strip contacts and heres what I was greeted with.....This is definitely contributing to a bad air/fuel ratio

[IMG][/IMG]

Everything is covered in corrosion...Time to start searching for a new AFM I guess

[ChubbWubWub]

Got the new Coolant temp sensor installed, and ordered a used AFM from eBay which will be here tomorrow. Plan on doing the rejuvenation process on the new AFM and giving it a try.

[papag1234]

https://www.youtube.com/watch?v=vS4-HdUFa7U

[5Toes]

check the fuel pressure regulator and do an ohm reading on the coolant temp sensor. those would be causing it to run crazy rich

[ChubbWubWub]

Finally got to updating. Got a new AFM from eBay super cheap and figured it was worth a shot. Turned out to be in amazing condition. Pulled it apart and did the usual rejuvenation process (Moved wiper arm to new resistor track and soldered wire to both electrical contacts. :D

First picture shows the comparison of the old AFM to the used one off eBay

[IMG][/IMG]

Next picture shows after the rejuvenation process

[IMG][/IMG]


Reinstalled the AFM and fired it up. Running 1000x better. Thanks for everyone's input! I already love R3V!