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Trying to adjust choke

2892 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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ha ha ha You know, I refrained from saying anything. I was afraid that "engineered like no other" might mean something different on German fuel injection.
I AM curious though. What are you pulling up on that you think is a choke?
If you're referring to the large plenum on top of the engine, that isn't a choke plunger nor is it operated by vacuum. That is the air plenum venturi. When you open the throttle, you essentially open the plenum, the computer senses the increased air flow and adjusts the fuel being injected into the motor.
It sounds like you have an air sensor problem to me.
I'm very new here and not well-schooled yet on these cars so I relinquish tech suggestions to those veterans here that are experts but I know of no manual adjustment. I think you'll end up finding you have a faulty MAP sensor, vacuum leak, or connection problem. The system (as I understand it) optimizes fuel mixture based on information received from a myriad of sensors and as such needs no manual adjustment.
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