PeachParts Mercedes-Benz Forum - View Single Post - Check Engine Light with P0130, P0301, P0304, P0303, P0300 codes

sdanville · #10 12-07-2006, 10:34 PM

I called the Grand Rapids Dealer and asked hoe much longer I had to wait for my cats. He bumped me up on his list. in 13 hours I will know if it is the cats.

This morning i had $3000.00 cats installed for free.
My Problem wwith misfires is gone. I wish I knew for a fact that was
my problem. The service guy said...(They charged me $80) to hook up or replace or reroute a vacuum line that was not working right on the rear of the engine. Maybe it was that, the cats, the computer reset..I may never know but the drive home was glorous. smooth idle, loads of power...no flashing lights.

Update --Bliss didnt last long. Rough idle. bought a code reader. PO170 and PO173. I thought I changed about everything it could be. What ever I change next ... I will update results.
1-29-7 I am now into about two months of trying to smooth my engine. I was down to only a slight rough idle. Then today was late and got on it a little hard. Engine light came on and rough idle. By now Ive bought my own code reader and PO302 came up. Cyl # 2 misfire.
- Tomorrow is Saturday..guess I might try switching coils to see what happens. With two spark plugs per cyl and two ignition wires...hard for me to comprehend its plugs or wires.
August 2007 Update : I installed the high priced stock Bosch plugs. No change. The idiot light only came on once this summer. It was another misfire code. I added sea foam, STP injector cleaner and marvel mystery oil. No luck. The ML320 drives fine and runs great, just has a rough idle yet. Not sure it bothers me enough to try $200 worth of ignition wires.