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vaspen
12-14-2013, 05:20 AM
ok so when I got the car 6 months ago it had issues we cleaned the maf fixed for a while then a coil pack went out fixed that still had a slight miss put
a new lower boot on went away for a while and gradualy came back so I replaced both lower boots still had a miss I changed the plugs
it went away

but what its doing now it every so often its got a slight rpm drop and with my loud azz exauhst you can hear it definitvly I have no idea why its doi ing this the upper wires are still good looking
and aren't corroded at all it has new plugs and lower boots and a freshly cleaned maf so its not a real big issue but I was wondering for any input

I have ngk plugs and ima switch to the bosh I don't like the ngk's
Tony_AMG
12-16-2013, 09:02 PM
go with Bosch regardless for these cars, I've learned from experience. then replace all vacuum lines to front of engine and back. the back one near the firewall will be the hard ones, so take your time and be patient. could be a 4+ hour job and remember how to reroute the lines back again the way they were. then check valves and MOT valve. throw in some carb cleaner / seafoam into the brake booster. I did on my 1999 C230 Kompressor and finally got it to a stable 750-+ idle
vaspen
12-17-2013, 05:08 AM
well im saying its about 95% of the time its fine then just a random BAAAAAAbuhBAAA
I do need to
replace one vac line but that's about it and I sugest doing only 1 vac line at a time for anyone just so its not screwed up haha

altho could I just unpop all the lines and take a airgun with a nosel to fit the lines and just blow em out ?
Tony_AMG
12-19-2013, 07:56 AM
Well is the idle drop / change during while in p or in d?
vaspen
12-19-2013, 11:57 AM
both
98Benzo
02-21-2014, 10:52 PM
I am having the same problem with my c230. Once in awhile while I am in DRIVE at a stop light or stop sign my RPM drops from 8-900rpms to about 5-600 then jumps back up. Spark plug issue? I replaced all the spark plugs about 4 years ago (50,00KM). I don't even know what is in there.
RemoLexi
02-22-2014, 07:02 PM
Lmao @ MOT valve !!

Sorry I couldn't resist, that's up there with 710 cap !
AMG KC
02-23-2014, 03:09 AM
Lmao @ MOT valve !!

Sorry I couldn't resist, that's up there with 710 cap !
The what valve?
RemoLexi
02-23-2014, 06:38 AM
It's the purge valve for the evap system. It had an arrow and letters MOT stamped pointing to the motor, so you don't mix the lines up. MOT valve, awesome!!
AMG KC
02-23-2014, 07:41 PM
Oh... I see!! No wonder ive never heard of it...