I last check the 02 with a dwell meter off the test terminal on the inside fender about a month ago. At that time, it was fine. I am "somewhat" familiar with a CIS system, not an expert, but have kind of a working knowledge of most of the systems. Not sure about the temp sensor though, as I don't think the CIS on my old 911SC has one, but I could be wrong?? Where would I look for and test the temp sensor on my car? It's a 1988 W124 with the 3litre gas engine. I don't think my car has the system whereby you can pull any codes, but again, I could be wrong.
Thanks again for your help. If I can't figure it out, I can always take it out into a field and shoot it! hee hee Ed 300E...the high idle isn't the problem, is all the slow traffic. lol :-) On 19/08/07, Hendrik <[EMAIL PROTECTED]> wrote: > > 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 > _______________________________________ 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
