1990 MB 300E Stalling - Had been stored 1 year prior...Please help! - PeachParts Mercedes-Benz Forum

Diesel1 · #1 07-19-2009, 08:57 AM

Hi,

I purchased a 1990 Mercedes Benz 300E w/87K several years ago which is in great shape. I have used it very little since because I have a 1983 300D w/159K as an everyday car.

Usually I would take it out every month or so for a run, but a year ago I changed the oil with Mobil 1 5W40 and hadn't used it since. Took it out yesterday for an inspection and it started up right away, ran it around the block a couple of times and them headed to the station when it stalled. It would not start again until 20 minutes later. Ran a couple of minutes and it stalled again. The stalling occurred while trying to accelerate from a stopped position. So I drove it back home and am looking for advise as to possible causes and suggestions.

- The car was kept in a heated garage.
- Changed the oil as stated.
- Battery Tender on battery.
- Put Stabil (stabilizer) in the gas tank.

Any help on what to do now or how to bring out of storage correctly would be greatly appreciated.

Sincerely,
Bob K

bsmuwk · #2 07-19-2009, 10:30 AM

You may have water in the fuel system. Run the car until it's empty and refuel with fresh fuel.

Oracle12345 · #3 07-19-2009, 10:59 AM

put some fresh fuel in it. Fuel that has been sitting goes bad after a few months

Diesel1 · #4 08-05-2009, 06:52 PM

Hi all,

I siphoned out the fuel and added fresh gas. Cleaned the throttle body seemed to run better so I went on a two week vacation. Yesterday went to start it up and it will not start at all. The starter turns over but it will not start.

I researched some past threads and realize it could be many parts: overload protection relay (fuse is good), fuel pump relay, fuel pump, fuel filter, spark plugs etc.

Before I start throwing parts at the car I was wondering if someone could suggest a logical order at which to proceed.

Any help at all would be greatly appreciated!

Bob K

tinypanzer · #5 08-05-2009, 11:11 PM

I think I can say without too much fear of contradiction that the most likely cause is fuel system related. Varnish can really take hold after a year, and there could be plugged up fuel system components left and right.

For starters, I would replace the fuel filter just because it's a good idea to replace the filter on a car that's been sitting that long.

If that doesn't help things, a fuel pressure test would be my next step.

Meanwhile, let's get under the hood and take the air cleaner off. Get a flashlight and start digging around looking for vacuum leaks. Any old rubber is suspect on a 19 year old car. Check the hose that goes from the valve cover to the intake manifold, it likes to crack on the underside. Check the hoses that connect to the idle air valve.

Also, pull out the plugs and see if they're coated up with oil or fuel. Clean or replace them as necessary.

Take of the distributor cap and inspect the cap and rotor.

All of those are things you can check out in about an hour total.

Good luck. Post your findings.

rayhennig · #6 08-06-2009, 05:07 AM

Panzer may have a point but I would start with the ignition system and the cheaper components and then look to fuel issues.

Does it start fine when cold and then stall when hot?

Classic symptoms of bad rotor arm.

Do NOT fit a cheap one. Get a genuine MB replacement.

Why?

Because there's a 1 kohm resistor in the rotor arm that provides suppression. In my case this resistor failed at high temperatures.

RayH

pawoSD · #7 08-06-2009, 12:55 PM

Hesitation when hitting the throttle could be a clogged fuel system....run a cleaner and new fuel! And change the filter...it is probably full of varnish.

Also, check the distributor rotor and cap as mentioned.

satyr · #8 08-06-2009, 04:15 PM

I gotta agree on the filter and bad gas. My truck sat for a year at a shop- and ran like garbage after I finally got it back, stalling, hesitating, running lean, etc. Turns out- little brown bits of gunk was pulled into the filter from the tank. I replaced the filter, and later had to replace the fuel pump since it had sucked up all that junk. That, and burning several tanks of fuel to dilute and get rid of the old gas I couldn't siphon out took care of the problem.

Diesel1 · #9 08-06-2009, 09:06 PM

Update: As suggested I purchased a distributor cap, rotor and fuel filter. Gave it one last try before installing the parts and it started right up!

Idled it for about 45 minutes and it began to run smoother. I got brave and went for a drive. First stayed within a few blocks then when there was no hesitation ventured to the highway for a 5 miles round trip.

Drove it back home let it cool down for a few hours, tried again and it started right up. Tomorrow I install the new parts and will keep using injector cleaner. I will update my progress.

Any thoughts?

Thanks,

Bob

Diesel1 · #10 08-08-2009, 07:27 AM

Changed parts and two more days of driving and it's still running and starting fine. I am noticing that the fuel gauge needle is jumping up and down but settles most of the time at the correct reading. Any ideas on that?

Thank for all the help.....this is a great forum!

Bob K

rayhennig · #11 08-08-2009, 11:21 AM

Quote:

Originally Posted by Diesel1

Changed parts and two more days of driving and it's still running and starting fine. I am noticing that the fuel gauge needle is jumping up and down but settles most of the time at the correct reading. Any ideas on that?

Thank for all the help.....this is a great forum!

Bob K

I lost track of the thread - what was the guilty party? Fuel or ignition?

RayH

400Eric · #12 07-03-2010, 08:23 AM

Quote:

Originally Posted by Diesel1

Changed parts and two more days of driving and it's still running and starting fine. I am noticing that the fuel gauge needle is jumping up and down but settles most of the time at the correct reading. Any ideas on that?

Thank for all the help.....this is a great forum!

Bob K

Bob, did you ever get to the bottom of the fuel gauge issue?
Regards, Eric

400Eric · #13 08-08-2009, 10:13 PM

A little cross pollination is in order here. 88 300E M-103 auto. turns over, won't start...
Regards, Eric

tinypanzer · #14 08-10-2009, 11:11 PM

There's always the possibility of a vacuum leak. Rubber can easily go bad when the car is sitting up.

400Eric · #15 07-05-2010, 02:41 AM

I did get the cluster from an 87 W124 diesel a while back (cause you told me to the get the speedo from it). Disregarding the different face markings, are those fuel gauges themselves the same?
Regards, Eric