I have posted several threads about this car on the other forum, my last post received not a single response. I've taken it to the dealer and even they couldn't provide an actual diagnostic. They want me to bring it back and leave it for further diagnostic.
Its an 01 S55 Amg. I bought it a few months ago with a CEL light and a pretty obnoxious vibration in reverse. About a week later before I could even tackle the obvious issues due to the holiday, I had a no charge/flat battery problem. Replaced the alternator and chased down a significant battery draw from aftermarket tv/dvd installation(previois owner). That was fixed.*
CEL code indicated that the car was running too rich at idle. Cleaned maf and saw immediate improvement until the following drive cycle. CEL was back and car was running rough, idling high and vibrating in any gear besides park or neutral. Replaced maf with new bosch unit. Same situation-immediate improvement until the next time I started it up. This time however, it ran terrible for a few cycles and seemed to platue where it was no longer idling rough and the vibration was barely there/less obnoxious in reverse. Intermittently I'd feel it return, but nothing like it was before the new maf.*
Generic code scan at auto parts store- P0100 MAF Circuit A. Cleaned connection, inspected wiring at maf, cleared code. Car went through same cycle of running great-terrible-platueing. My tech read code with slightly more advanced tool- P2004 Hot Film Sensor. My tech is a family friend who runs a body shop, he does brilliant work but hasn't had alot of time to donate to troubleshooting this. Lifted carpet in passenger footwell looking for infamous k40 fuse, found additional wiring for dvd system- ac adapter, "amp" fuse and a converter box that was generating alot of heat. He removed them and capped those wires.*
Car ran the same but upon a second drive cycle (cold start) I had an rpm surge to about 1500 and stayed there then down to 1000. While waiting for him to have another opening in his schedule, It did it's same run terrible-platue cycle. This time however, I started noticing intermittent surges upon breaking. Rmps will gradually drop and once they get to about 900 they will shoot back up too 1000 before continuing to drop and you feel the jolt. At one point since this started, after placing the car in park it reved to 1500 and stayed there until I put it back into drive, then it lowered to about 700. Put it back in park and it was fine.*
Since then, cold starts seem to take more effort and upon starting it hits 1500 and then I can watch the rmp needle hunting at 900-1000. Before it comes to temp, idle feels clunky and vibration is apparent.*
Took it to Mercedes the other day out of sheer frustration and the only thing they could tell me was that I needed engine and tr anny - suspected the tranny mount due to vibration. Regarding the CEL/MAF and idle surging- all they could tell me was that the voltage to the MAF was too high even with the car off. Im a female, I dont do my own work but I do troubleshoot to help my guy along given the fact hes got a business to run too. Mercedes can't even pin this down without me leaving it for them to tinker with and Im lost in all the information I've read. My vin is as follows: WDBNG73J61A168010.
ANY HELP IS MUCH APPRECIATED.*
Its an 01 S55 Amg. I bought it a few months ago with a CEL light and a pretty obnoxious vibration in reverse. About a week later before I could even tackle the obvious issues due to the holiday, I had a no charge/flat battery problem. Replaced the alternator and chased down a significant battery draw from aftermarket tv/dvd installation(previois owner). That was fixed.*
CEL code indicated that the car was running too rich at idle. Cleaned maf and saw immediate improvement until the following drive cycle. CEL was back and car was running rough, idling high and vibrating in any gear besides park or neutral. Replaced maf with new bosch unit. Same situation-immediate improvement until the next time I started it up. This time however, it ran terrible for a few cycles and seemed to platue where it was no longer idling rough and the vibration was barely there/less obnoxious in reverse. Intermittently I'd feel it return, but nothing like it was before the new maf.*
Generic code scan at auto parts store- P0100 MAF Circuit A. Cleaned connection, inspected wiring at maf, cleared code. Car went through same cycle of running great-terrible-platueing. My tech read code with slightly more advanced tool- P2004 Hot Film Sensor. My tech is a family friend who runs a body shop, he does brilliant work but hasn't had alot of time to donate to troubleshooting this. Lifted carpet in passenger footwell looking for infamous k40 fuse, found additional wiring for dvd system- ac adapter, "amp" fuse and a converter box that was generating alot of heat. He removed them and capped those wires.*
Car ran the same but upon a second drive cycle (cold start) I had an rpm surge to about 1500 and stayed there then down to 1000. While waiting for him to have another opening in his schedule, It did it's same run terrible-platue cycle. This time however, I started noticing intermittent surges upon breaking. Rmps will gradually drop and once they get to about 900 they will shoot back up too 1000 before continuing to drop and you feel the jolt. At one point since this started, after placing the car in park it reved to 1500 and stayed there until I put it back into drive, then it lowered to about 700. Put it back in park and it was fine.*
Since then, cold starts seem to take more effort and upon starting it hits 1500 and then I can watch the rmp needle hunting at 900-1000. Before it comes to temp, idle feels clunky and vibration is apparent.*
Took it to Mercedes the other day out of sheer frustration and the only thing they could tell me was that I needed engine and tr anny - suspected the tranny mount due to vibration. Regarding the CEL/MAF and idle surging- all they could tell me was that the voltage to the MAF was too high even with the car off. Im a female, I dont do my own work but I do troubleshoot to help my guy along given the fact hes got a business to run too. Mercedes can't even pin this down without me leaving it for them to tinker with and Im lost in all the information I've read. My vin is as follows: WDBNG73J61A168010.
ANY HELP IS MUCH APPRECIATED.*