When is the last time you tested your O2 sensor, in a KE car the O2 sensor is the most important input when the car is at operating range. If it is telling the system that the exhaust is lean then the FI computer will try and dump more fuel into the motor. However if this is an intermittent problem I would be looking at temp sensor going wonky, which will tell the idle adjustment motor to up the amount of air going into the motor. Air leak? Doubtful as it would be a constant thing and a vacuum tube leaking (which can be intermittent) wouldn't cause this amount of high idle. Just to explain this a bit more, in order to have a high smooth idle of 1700-2000 you need both more air and fuel, just having one will make the car run like a dog. So if you have an air leak on the other side of the air flow sensor plate then you will not have more fuel going into the engine and as such will have a lean mixture (lots of air but not enough fuel). How familiar are you with the CIS/E system? What you really wanna do is to reproduce the problem on demand by making the motor think it is cold when in fact it is at operating temp. If by doing this it goes up to the high idle you mentioned, then you know which circuit is being naughty. Also the later KE (KE3(?)) systems have a primitive fault code readout which is easy to do with the right equipment. Hopefully others will stop talking about you know what and help you out with your real MB problem. BTW is it a E300 or 300E, they are two very different cars with very different FI systems.
E M wrote: > Hi everyone, > > Was out yesterday and got caught in traffic. Drove from about an hour, with > a lot of bumper to bumper traffic. When I came to a stop, as in end of > trip, and put the car into Park, the idle climbed to between 1700-2000 rpm. > At stop in traffic, it would idle about 1000 rpm, but it felt like it wanted > to pull away, as in, required a little more pressure on the brakes to > prevent becoming too friendly with the car infront. I suspect some kind of > an air leak, but not sure just where to look. Kind of feels like a WUR > stick up and keeping the idel high, but once the car is allowed to cool for > an hour or so, the idle seems to be fine again. Oh, the day about about > 75-80F with little humidity. Car also starts fine and idles in a normal > range. > > Any thoughts?? > Thanks in advance. > > Ed > 300E > _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
