Idle problem 320i Euro Pre.

[Miguel320]

Hello.
My name is Miguel. I'm from Spain. I bought a 320i euro pre on Nov. 2012. I've been reading a lot of topics in this forum since then.
But now, it's me who has a problem. This is the explanation:
I suspected that there was a problem with my throotle position sensor so I did the test procedure and it revealed that the "no throotle switch" was faulty. There was no continuity with the trootle pedal off. I opened the tps and found a lot of oil in the interior. I cleaned it and test it again. ¡It's OK! ¡It works!
I cleaned also the throotle body. There was a lot of burnt oil in the butterfly valve, so I cleaned it all. Now, as a result there is more air moving to the engine and the revs went high (everybody who has cleaned a throotle body knows this). My idle speed is now 1200rpm. I tried to decrease the idle speed turning the idle screw clockwise, but it doesn't work at all. I make 4 complete turns and the idle speed was exactly the same. I also tried the screw on the air flow meter with no success.
How can I solve this problem?
The car is a '86 320i Euro Pre with LE2-Jetronic injection.
The problem is the same with the TPS not switched, so that's not the problem.
I want to mention that this car has no idle control valve as the Motronic versions.
I hope you understando my English.

[Grrrmachine]

Your Jetronic car has something called an Air Slide Valve. In 99% of cases with high idle, this is the problem.

http://www.e30zone.net/e30zonewiki/inde ... lide_Valve

Unfortunately, now that you have touched the screw on the air flow meter, you will have to take the car to a mechanic to get that reset. You will also need to return the idle screw on the throttle body back to its proper position.

[Miguel320]

Your Jetronic car has something called an Air Slide Valve. In 99% of cases with high idle, this is the problem.

http://www.e30zone.net/e30zonewiki/inde ... lide_Valve

Unfortunately, now that you have touched the screw on the air flow meter, you will have to take the car to a mechanic to get that reset. You will also need to return the idle screw on the throttle body back to its proper position.

Thank you for your response.
I thought about the air slide valve, but I didn't touch it during the cleaning of the throotle body. I put the screws in the same position the were before. Anyway, no worries, I have a gas analyzer to set the correct % CO.
I will follow the test procedure for the air slide valve. Thank your the link.

[Miguel320]

I have just came back from testing the air slide valve.
First of all I want to let you know that I found a plug inside this air pipe:


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Yes, I know that's not the air pipe to test the Air Slide valve. Anyway, I want to know if that plug is original stock or if it was plugged by a previous owner.

I tested the air slide valve with and without this plug.

1: Plugged: RPM dropped to stall while clamping the air hose from the air slide valve to admission.

2: Not plugged: RPM dropped to 800rpm while clamping the air hose from the slide valve.


What do you think?

[Miguel320]

I'm thinking that maybe someone put that plug to compensate the excess of air from a faulty air slide valve...

[Miguel320]

Should the air slide valve close completely when hot?

Hot Air Slide Valve: