560 SEL Rough Idle (Another one!) - Page 4 - PeachParts Mercedes-Benz Forum

#46 06-25-2002, 10:08 AM

Hi Henry - wellllllll????????????

hbofinger · #47 06-25-2002, 10:26 AM

Did a great trip - went VERY smoothly (except for a screaming AC belt every once in a while when accelerating - gotta tighten that up!). No complaints except the occasional cruise control disengagement which I started a thread on on this board. Rough idle is definitely gone except when in Park and Neutral. Smooth as can be when in drive. Got about 17.1 mpg mixed (though mostly highway).

My weird "D" engagement problem I have complained about seems more and more like the dreaded B-2 piston, since it does not happen in "R". So next week I am taking it to the shop to have the transmission and tourque converter flushed, and the B-2 piston replaced (I don't have the time to do it myself), before it fails catastrophically on me. This guy offered me the use of all his lifting equipment in the shop if I decided to do the job myself. Nice! I have been a customer of his for six years.

These are great cars! I had it full of people. What a blast!

#48 06-25-2002, 01:11 PM

Before you go crazy on your cruise amp - I will tell you my little story. I did not use my cruise for about 2 years because I was working on various things on the car and did not take it on a highway run where cruise could be used. Last fall I took the car for a 40 mile run on the highway and engaged the cruise - the car started to slow down and speed up and sometimes felt like it wanted to stall with the cruise on - disengaging the cruise - the car was perfect - I then re-engaged the cruise and ran it with the speeding up and slowing down - as I drove - it seemed to get better - in the last 10 miles it never acted up once. I then had the car in winter storage from Oct. to May of this year. My first trip out - the cruise started to act up again - but after about 60 miles settled down and started to work perfectly. It has not acted up since. I am thinking that maybe contacts were dirty or corroded from sitting and by using it - they got cleaned off. Just my two cents worth! If you haven't been using your cruise for a while - keep using it regularly and see if it works better. If not - then check your amp. Cheers!!
Maurice

hbofinger · #49 06-25-2002, 01:24 PM

Maurice,

I've heard that before you suspect ANYTHING serious with the cruise you should clean & lube the throttle linkange. I already wanted to do that BEFORE this trip, so that's next on the agenda. Somehow I think it's something stupid and simple, like a bad contact or a loose switch, or the linkage being too stiff and therefor the actuator shutting out. Why? Because 90% of the time the thing works like a charm. It holds speed. All it does occassionally is disengage, usually abruptly during accelaration. Then, if you hit resume, it tries to find the correct speed, i.e. it will engage, and if it does not disengage again, the car will accelarate to the correct speed and hold, until I stop it or it disengages again. It could even be something dumb like a loose brake pedal switch or something like that.

I'm just happy as can be that I was able to trust this thing for a long road trip. Oh yeah - it turned 100k miles on the trip, and we took pictures of the odometer at 99999 and 100000! First time I've ever witnessed this!