How to regulate the low RPMs (mechanically) ?

[Niko]

Guys,
500E 1993, is there a way to mechanically regulate the low RPMs on our engine?
I have seen the 1991 V6 engine to have this, in front of the throttle body there is whole to enter a screw driver to open/close?
Thanks


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[jhodg5ck]

No, there is no mechanical regulation that is user adjustable.
Do you have a high idle?


jono

 

[J-Sauce]

The only adjustments I know of are the throttle cable and linkages.

 

[gerryvz]

Yep, idle is 100% computer controlled, no way to adjust it. Not like a 117

 

[gsxr]

There is no mechanical adjustment. Sorry. What is the problem you are trying to fix?

 

[jhodg5ck]

117....yer a funny guy!

 

[Niko]

I have a low idle 470- 530 rpm & engine misfire.
Have changed the distributor caps, rotors and plugs (Bosch). The engine harness is 2006. Have changed and reset the LH module, keep getting the code 11 @ module 4.
Fuel filter is new too, today i tried to clean the throttle body cap with spray cleaner (noticed dark light cover on corner), wasn t very successful procedure, hard to get there. By the way is it easy to remove it completely, think it is a good idea to clean it well.
Thanks again for your opinion.


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[Trae]

Have you tested the spark plug wires?
They should test at 2000ohms resistance from the coil to the top of the spark plug boot.

Pin 4, code 11 says
"Secondary air injection system, open/short circuit".
I don't know what that is, however, someone on the board will.

 

[Maui]

Have you tested the spark plug wires?
They should test at 2000ohms resistance from the coil to the top of the spark plug boot.

Pin 4, code 11 says
"Secondary air injection system, open/short circuit".
I don't know what that is, however, someone on the board will.

Is that the sensor that plugs into the driver headlight air intake?

 

[Trae]

No, I think that sensor is the Outside Air Temp sensor that provides info to the LH module.

 

[gsxr]

Idle speed is controlled by the E-GAS module. See if you have the correct module installed.

Idle speed should be ~600rpm at hot idle in park... about 500rpm at hot idle in gear.

 

[Niko]

The spark plug wires are changed not long time ago. I will check the E-gas next.

Can you please advise me the correct part # please?

Also - have someone removed the throttle body to clean it and if yes - what is the best way to do such?

After - i think for the injectors (they are green)...


Thanks




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[gerryvz]

I would be very careful about messing with the ETA (throttle body) as it is likely yours is original, and these have the "eco-wiring" in them which can cause failure if it is disturbed. If you want to clean it, I'd just leave it in place and spray some carb or brake cleaner onto it and clean the surface with a rag, if you can get to it. But it's a sleeping dog (wiring wise) that I'd let lie.

A good starting point part number for the E-GAS module would be 124 545 45 32.

 

[Niko]

I understand thank you


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[gsxr]

A good starting point part number for the E-GAS module would be 124 545 45 32.

Keep in mind there are early & late E-GAS modules, and they are different in each region (USA, Europe, etc). 124 545 45 32 is the late USA module, 124 545 07 32 is the early USA module.

If your car is a Japan import, it may have module 124 545 44 32.

 

[Niko]

I opened carefully the throttle grid to spray in with special "throttle body cleaner" and noticed crack on the brown plastic ring there, please see the photo. Do you think that this might cause any problem, the wires inside seems fine?

My second question: i have no codes, could the e-gas module fail since no codes are present?

Thanks

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[superstar]

The above image is MAF (Mass Air Flow) sensor. I thought you were talking about ETA (throttle body)??

 

[gsxr]

The crack in the brown plastic shouldn't hurt anything, although it is a little strange. ANd yes,that is the MAF, the throttle body (ETA) is below it.

If your E-GAS module was bad, there should be some codes. What is your idle RPM in park/neutral? Have you verified the tachometer is accurate?

 

[Niko]

In P or N is better - 550 rpm

I feel "coughing", sudden power drop like 2 or 3 cylinders are dead, you can t really kickdown too.
Sometimes it starts fine but only for a couple of minutes. After 2500 rpm is OK!


The car is very well maintained overall.

What else can i check?

Thanks


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[gerryvz]

I think it's ignition, and your plugs aren't getting clear and consistent power delivered to them.

 

[Niko]

Thanks, will try to find someone with a digital scanner for better diagnostic.


UPDATE: Usually i use 91 Oct from the local Costco. Today i decided to try 94 Oct with additive from Petro Canada and there is definitely improvement . I feel less "quake".

Now i think for the injectors. They are green, have you changed yours and from where did you buy them?

Thanks


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[Niko]

I think to try replacing the injectors and if no positive result - then will change the E - GAS module. Will do that first because there are no codes present to connect the issue with the E-GAS...
How big is this job DIY ?
Anyone have done that so far?
Anything special or any tips from your experience will be greatly appreciated.
Thank you!



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