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Trying to adjust choke

2896 Views 17 Replies 8 Participants Last post by  crickle
Hey there,

I have a 1989 560SEC and just moved up to the Central Interior of BC, Canada, from being on the coast in Vancouver, BC. On the way up the car started choking up and becoming sluggish. I've been informed by a few people that my air/fuel rate needs to be adjusted. When in idle it sputters and then eventually shuts off. When i pull up on the choke a couple millimeters it idles smooth. I am completely new with Mercedes and I am having a hard time figuring out how to adjust the choke.

Any help will be appreciated.
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More important questions:

Is this a vehicle with K-Lambda- ie, does it have an oxygen sensor? Does it have an EHA valve? (google the terms and look at some pictures to answer).

Does it run equally crappy when it's cold vs. hot? Does it run better or worse cold or hot?

I'm wondering if the cold start injector could be stuck open. IF the vehicle has electronic controls and it's running crappy once warmed up, then there is something totally screwy- or someone has REALLY screwed the thing up.

Pulling up on the sensor plate definitely reduces the amount of fuel being injected. So it's certainly running rich.

To find out why, we need to know which system you have in order to help diagnose it. Feel free to take the air cleaner off and take lots of pictures. Pictures are worth 1000 words. If you have a completely mechanical system, it's entirely possible adjusting the mixture at the airflow sensor will solve your problem. If your engine has electronic controls, that's a whole different ball of wax.
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