I am getting a 2-3-2 code on my 1990 240 dl. What could be causing this? I don't know anything about these. I bought it for $500 with 311,000 miles and this is the first problem I've had.

 

Long term fuel mixture too lean at idle.

 

Could be a vacuum leak.

Check all the vac hoses and intake gasket.

How is the engine running?

 

It still runs pretty good. I started to leave work the other night and it idled really high and when I started moving it chugged pretty bad. So I thought the tps was bad or had a bad connection. I wiggled the plug a little bit and it started to stall. Then I unplugged the air flow meter and started it thinking that was bad, but it didn't make a difference. Ever since I did that the check engine light has been on and it has been running fairly well. I checked all the vacuum hoses I could and there all in good shape.

 

What you need to do now is erase the codes in the ECU. There should be a fuse for the ECU, but I'm not sure which one it is.

Is there a fuse by the l fender, near the power steering pump?

If so, pull that fuse, and re-install it and start the car. The CEL should be off, and see if it runs any different.

 

I'll try that. Thanks

 

I was getting that on my 1990 240dl recently, too. I brought it in and my mechanic told me it was a result of me having misthreaded one of my spark plugs. Did you recently change your spark plugs?