Date registered: Aug 2012
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Problems with my 88 300E
I'm having problems with my 88 300E. Lately if I've been driving it for a couple minutes, I get problems with the car starting to sputter and run really rough. Mainly at low speeds, but I can feel that it's not quite right at higher speeds as well. If I let the car sit for awhile, it will be running fine the next time I get in until I've driven it for a little bit. I was living with the problem fine for awhile, but eventually it cut off on me at a stop light and would not crank. It turned over just fine, but would never fire up for more than just a cough. After letting the car sit for a couple hours, it cranked fine and I drove it home. I took it to a mechanic who works on Mercedes and he didn't seem to know what the problem was. He replaced the fuel filter and did a couple other small things, but three days after I got the car back, the same thing happened again. I have noticed that the problem seems to be worse if I let the car sit all day the day before without driving it at all.
I've been pouring over threads on this site and it seems that the mostly likely causes are the OVP or the fuel pump. I do have my ABS light come on regularly, but it doesn't stay on at all times. I'm thinking about getting some used parts and just replacing the OVP and fuel pump both to see if that will fix the problem. Is there anything special to know about replacing the fuel pump? The OVP seems pretty straightforward. Also, is it worth replacing the fuel relay while I'm at it? Any help is appreciated.