So I know there has been a lot of posts about this and I have tried to search and comb through those posts but I am not sure what to do from where I am with this car.
To start off, I recently purchased a 1989 190E 2.6L. Its been off the road for a couple of years and needs some TLC. When I went to check out the car, the guy had to jump it as it hasnt been started in a while, but after starting it, the engine roared to life and ran actually pretty smoothly. We went for a test drive and it was about 15 minutes and I got it up to 60 MPH.
I got it towed home as I driving behind the truck. When I got home, I was excited to drive it and I went I took it out for a drive, it sputtered and shut off. Luckily, I was able to limp it back home but had to restart the car many times. So I thought it was a fuel issue as I knew there was fuel in the tank.
I removed the entire gas tank, replaced the in-tank filter and inline filter and cleaned out the gas tank. It was really bad in there and I am really glad I went through that hellscape because it was damn dirty in there.
So, today, after installing the tank and new filter, connecting the lines and new gas I took it for a drive. Took a second to start it for the first time in 2 weeks but after than, she started right up every time! I did noticed though a weird sound coming from where the fuel filter/pump was (this may lead to what the issue is, but we will get to that).
So I took a drive down to the gas station and filled up, no issues. I then went to a drive through car wash because she really needed it. This where the problems came back. As the car was getting washed and just sat there, it turned off on me. I didn't think much of it, and started the car again, started up right away. However it kept happening with the car just sitting there. At one point the engine wouldnt start up, so I have to get the car in neutral and push it out of the carwash... Got it into a parking spot, started the car up and started to drive home, about 2 times the car stopped on some main streets and the final distance it stopped about 5 times before it finally got home.
Here is where I am a little lost on what I should do next. When I test drove the car it ran fine, but when I got it home it started stopping mid drive (same day). I replaced both fuel filters and cleaned the tank which it desperately needed. But the issue still occurs. I checked the OVP relay with a test procedure I found on this forum and it tested just fine (btw its an original Mercedes OVP relay, its date stamped with 7/5/89...) Could it still be the OVP relay?
I did mention went I started the car for the first time there was a weird sound coming from the fuel filter/fuel pump location, could that be my issue? A family member suggested that sludge from the fuel tank could be in the fuel lines.
I know these two things could easily be the issues I am seeing, but I want to make sure before I go buying parts that wont fix the issue. What else could I check to eliminate any other suspects?
To be honest, I know these are kind of dumb questions but I am just hoping to get some direction here.
PS. I have a new battery in and I do have new non resistor spark plugs, oil and oil filter on the way. I also replaced the air filter, but that was after I stopped driving the car.