E21 323i irregular idling

[Pablo19]

Dear. I am having an idle trouble.

It is a 1981 E21 323i

The car runs great but it started to fail when idling.

When the car is cold it fails less and it becomes worst when warming.

I uploaded a video for easy explanation.



Thanks in advance.

Best regards,

Pablo

[Jeroen]

Did this start all of a sudden or after work was done? Most likely options: 1. a vacuum leak , check all hoses around the intake 2. check the exhaust gasses and especially the CO%, it may be off by a bit.

[Pablo19]

Hi, thanks for your reply.

I replaced the spark plugs and it was ok for a couple of weeks. Then started to do this.

1. It is what I thought. I found but I could not discover any leak.

2. I dont know how to do it. Could you please help me to find information to do that? Is any link explaining?

Thanks again.

[polov8]

You'll have to take it to a garage that can stick the gas analyzer up the exhaust. But I doubt it'd cost you much, if anything if you have a friendly local mechanic.

[Pablo19]

I am going to the garage next week.

What should I expect from the exhaust readings?

In which manual can I found info about the necessary adjustments to do?

Kind regards,

Pablo.

[Jeroen]

Make sure static ignition timing is correct (22 degrees before TDC @1500 rpm with vacuum hoses disconnected from the ignition distributor)

Suggested CO is abt 2.0% @900 rpm (depending on local emission laws). CO is adjusted with a long 3mm hex driver on the fuel distributor, Idle with the brass screw on the throttle body.

[Heinrich]

Any updates on your problem?

[pic]

Hi, thanks for your reply.

I replaced the spark plugs and it was ok for a couple of weeks. Then started to do this.

1. It is what I thought. I found but I could not discover any leak.

2. I dont know how to do it. Could you please help me to find information to do that? Is any link explaining?

Thanks again.

If you bought french NGKs, just throw it far away, and buy Denso.