M30b35 idle ~2200

[frankie591]

Hello all,

Got my swap running and driving and trying to troubleshoot why my engine is idling at 2200.

Engine is a b35 from an e24 635csi and I plugged my late model e30 325i harness into it with a few extended wires. I have no check engine lights and no vacuum leaks that I could find.

My ICV was acting up so I replaced it with a known working one from my m52. My ideas so far would be a problem with the ECU, AFM or the FPR. I am looking to find some used ones locally to swap out and see if the situation improves.

Any help or suggestions are appreciated.

[Mr. Burns]

which ecu are you running?

don't quote me, but I believe you need to run a 179 ECU(e34 535) in order to get the values correct

otherwise TPS signal?

[Mr. Burns]

btw congrats on the swap!

pics!! vids!!

this is the swap I was going to buy off you lol

[frankie591]

It is a 179 ECU. I've tried swapping the tps with my m20 tps and it didn't change anything so I don't think that signal is bad.

[kronus]

massive vac leak?

[frankie591]

I guess I'll check again a little more thoroughly but I sprayed carb cleaner all over the intake top and bottom and didn't detect any major leaks.

[Mr. Burns]

Any luck?

[uturn]

Throttle cable or stuck open charcoal canister solenoid?

[frankie591]

charcoal valve is plugged into the harness but not hooked up to the intake so that isn't the case. I used the charcoal canister port to feed my brake booster since my intake manifold didn't have a booster vacuum port.

I have a line on a spare ecu and afm to try but I can't get them until the weekend so I might be out of luck if I don't find any vacuum leaks. Really jealous of people who have junkyards with older bmw's in them. Anything around me is lucky to have 1 e36, never see anything older than that really.

[frankie591]

Just as a follow up, it seems that either my ICV or however the ECU controls the ICV is acting up. I took the ICV off, plugged the hole in the rubber intake runner, and put a cap in the ICV hose going to the intake manifold with a 3/16" hole and the motor idles perfectly.

I think it is an ECU issue as the ICV I had on the engine is from my m52 and works perfectly on that engine. I'm getting a spare ECU this weekend so hopefully I can put the ICV back onto the engine without problems once I swap the computer.