WELL after throtle body clean its still there.

AT IDLE RPM'S GO DOWN THEN BACK UP WHILE IN DRIVE AT STOP LIGHT AND IDLING, NOT EVERY TIME. OTHER THEN THAT NO PROBLEM WITH ACCELERATION AND CEL NOT ON. MECHANIC SAID DIDNT DO IT TO HIM.

WHAT WOULD CAUSE RPMS TO FLUCUTATE AT IDLE?

SPARK PLUGS CHANGED 6 MONTHS AGO AND NOTICED IT AFTER ONE MONT. CAN THAT DO IT.

1998 C 230.

HELP, TIRED OF PAYING THESE GUYS THAT HAVE NO IDEA, OR NO EXPERIENCE.

 

ok take your car to a dealer you need to have a star diagnosis hook to your car so that the tech can see whats going on yes i relize that a dealer costs more $$$$$ but a dealer will stand behind there work a little more that an independant shop will. let me tell you something independant shops are where bad mechanics go after they get fired from dealers most dealer only employ good techs thats why they have to charge more

 

I am asking question to see if anyone has idea, cause dealer WILL start changing parts with problem still there.

I HAVE DEALER EXPERIENCE AND NOT GOOD!


So if ANYONE HAS HAD THIS or has idea from symptoms please post, cause that is what forums are for, otherwise take to dealer!!

 

lore benz, you must see if you have a vaccum leak on this car. check all vaccum lines and hoses. you should have it scanned with SDSto see if there are any fuel trim codes, as i have replaced a million MAF's on these cars.if not then you may have a throttle motor going south. tell your mechanic to use a smoke machine on this thing.
no spark plugs will not do it in an of themselves. butthe techcould have created the problem while replacing them.

vytamenc....your statement couldnt be further from the truth. you should be more careful in your generalizations.

email me lore benzand i will set you up with a capableshop in your area if i can.

 

HOW CAN A MECHANIC CAUSE PROBLEM WHILE REPLACING PLUGS, BECAUSE THIS STARTED AFTER THAT 6 MONTHS AGO?

COST RANGE FOR THROTLE MOTOR?

 

INDEPENDENT STATED CODE SHOWED THROTLE BODY, BUT THIS CAME UP WITH CEL AFTER I CLEANED THROTLE BODY.

WOULD THAT BE SAME?

 

TODAY DRIVING CAR NO CEL BUT A STOP SIGN IDLE DOWN THEN UP.

Got to find mb shop in houston that does good work.

 

Today after 20 stop signs and 15 long lights, didn't do it once!!!

WTH is going on with this car.

 

what about air pump motor??

COULD this be doing it, what are symptoms for this??


throtle actuator, what symptoms for this??

 

I have this same issue with a 2005 c230 kompressor. I have this same problem when im in drive with my foot on the brakes. I was receiving a code p0620 Generator Control circuit and replaced the alternator because the voltage regulator failed. I still have the same problem. I noticed i can make the rpms drop when i turn on anything electrial. This happens while in neutral as well. I turn on the headlights or ac and I can watch the rpms drop. Also can makerpms drop by rolling up the windows. This is very annoying being its the worst with the ac on. Basically it wants to sputter at low rpms when there is an electrical load. Also notice it does it when turning the steering wheel. Please any input would help. Thanks