How to repair Mercedes high idle M117 vacuum leak part 2

How to repair Mercedes high idle M117 vacuum leak part 2

Second part of repairing and diagnosing the vacuum system of the Mercedes Benz m117 vacuum system.

My apologies for the bad filming. Wil improve next time but the information is what counts.

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John Doherty says:

If you are still active, thank you for these very educational high idle and vacuum leak videos. I have a 1983 500sl with the 117 engine and K Jetronic (not KE) injection system. In this video you test a blue/black check valve, but in the part 1 video it is a green/white valve (like I have), which I understand is not a check valve, but a restrictor. What is the purpose of the green/white valve and did you replace it with the blue/black?

frostshock13 says:

Oh Richard I really appreciated all these videos. Though dare I say I am beginning to hate this car.
I went through the first hell replaced tons of stuff, computer, all the fuel injectors/hoses, ovp, idle valve replaced.. I have gone through case of carb spray.. ran fine for like a week idling great. Then back to like 950-1k rpm.
The economy on the dash shows pegged to left.
Will run the gambit on these items.
Guess its time for smoke and vacuum test gauge or to sell it off.

Mikes Mercs and other cars says:

I have a couple of questions relating to your excellent Vacuum video. 
1. Are the various Vacuum system independent of each other. For example would a leak in the central locking system affect engine running?
2. Am I right in thinking that an economy gauge not sitting on zero when the car is idling implies a vacuum leak? If so, what could a vacuum leak in this part of the system affect? eg rough idle, cold start, fuel economy etc
Mike

Z Banks says:

I am working on a 85 500SEC Euro that was converted to US spec and has some unknown aftermarket O2 sensor connected. It has the same connection coming off the warm up regulator going to what in effect is a fuel injector. If I remove the system, I still need to power the injector. I am attempting to sort this out. The videos were very helpful, since it is a European Model.

TAXCOLLECTOR2017 says:

Excellent post. That system is on so many different cars.

Yasin Bozdağ says:

Hello, my 500sec shift gear in maximum 1900~2000rpm, my bowden cable it's okay, do you think is vaccum system problem?

Marshal Sequeira says:

Hi Richard,

Very helpful videos thanks for taking the timeout to share.

I want to do a smoke test on my W126 560 SEL, can you tell me where I should connect the smoke producing hose? And what I should cover up?

Many thanks!

Wolfgang Kaminski says:

Hi Richard, thank you for your detailed video. I have a 1983 500 SEC and exactly the same idle control unit. Mercedes wanted to install A new ABS control, only the repair was about 240 euros and a new one …..?(fortunately they didn't tell me the price), because in the dash board the ABS lamp was on but the breaks of the car were stopping as normal. YOUR VIDEO IS A MONEY SAVER. Thanks a lot.

عبدالله الحارثي says:

هل من مترجم …!

Big George NY says:

Hi Richard I have a question if I sent you my idle control computer would you replace those resistors for me of course id pay you for your labor?

cwwhk says:

Very detailed and informative.  Thanks for sharing your knowledge.

George Basha says:

this is a most fantastic source of vacuum information. I applaud your intent to educate those of us who need this kind of help. May i ask or plead with you to do it again in the future ,when you have the time, to do it again with your assistant using the proper lighting. Please accept this in the matter intended, that is to help us out here who love what you do.
Thanks

Mahmoud Alkaabneh says:

Richard, your videos are through and easy to understand. I live in Jordan and own a 1984 380SL. surely, I will use your videos to fix the vacuum leaks in my car. thanks.

blahblahblah48504 says:

Thanks, this was interesting to watch. I have a vacuum leak on my newly bought 560 SEC. Economy gauge sits at about 1/5th from the left at idle. It's quite confusing for a novice home mechanic.

rgubbels100 says:

Hello Richard, the video's on the MB engines are very interesting. Are you by any chance located in the south of the Netherlands? Regards, Ruud

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