Random misfire/no start om617 - PeachParts Mercedes-Benz Forum

ashedd · #1 03-05-2011, 10:10 PM

So my TD has always ran very well. About three weeks ago the exhaust fell off and it's been sitting, I have driven it once since. Today I needed to drive the TD because a drunk hit my 400e while parked in front of my house.

Start up was fine, low idle/small throttle input through the neighborhood(it's very loud) was fine. Once I got out on main road's it was fine. I came to a stop light and noticed a rough idle. By the time I got to my destination, about 5 miles later, I was having to shift to neutral and hold about 1500 rpm at the lights.

Once I got done with work, about 6 hours later, my TD would not start. I got it to start with heavy cranking and fast pumping of the throttle. Blue smoke was belching out of the remaining exhaust. Glow function seemed to work fine. Once started I had to hold 3000 rpm until it sorta smoothed out and would stay running. The entire 6ish mile trip home I had to keep the rpm above 2500-3000 and shift to neutral at lights with 1500 rpm.

Once home I swapped the primary filter with no difference. Went to the store(took the 300d) to get a secondary and have not been able to get it to start since. I pulled the air filter off, no difference. Everything looks normal under the hood. Last time I checked(about 1.5 years ago) the timing stretch was 1.5*. Turbo is spinning freely. Once it was running it smoothed out above 3000 rpm. No noticeable smoke once running.

Seems like it "jumped time", but I dont know how. Again, my TD always ran very very well.

Any ideas?

ashedd · #2 03-05-2011, 10:14 PM

FYI..

My 400E was hit by a drunk last night, body damage and pushed front drivers wheel aft into the body. Looks totaled to me. Pretty effed up.

300D- has a diff issue and is technically inop.

300SD- was removed from service last summer. No insurance or plate OR radiator installed.

300TD- who know's???

The 400E has been my DD. I am out of cars to drive.

babyjames · #3 03-05-2011, 11:28 PM

Turned to jelly in the tank? Clogged strainer? Bad lift pump? Try an alternate fuel source. Like a can of Diesel Purge.

Jay.

ashedd · #4 03-05-2011, 11:40 PM

I thought the fuel might be suspect but it's winter blend, it's been over freezing for over a week, the last time I put fuel in it I added anti-gel stuff cause it was really cold.

Strainer.. I dread messing with that.

I figured I would: try an alternate fuel source, pull the valve cover and check the timing marks, perhaps try to set IP timing. But I just can't imagine any of the timing could just get mess up out of the blue.

I hope there was not some sorta timing chain/tensioner failure. I only assume that with 1.5* of stretch that the chain was replaced at some point. I think the car has 303K on it now.

The only "strange" thing I did today was drive through a puddle in my ally and the broken exhaust sounded like it went under water. My TD sounded like a boat for the 1/2 a sec it took to get through the puddle.

babyjames · #5 03-05-2011, 11:54 PM

Sounds like it might be sucking air. Did you use the hand primer when you changed either of the filters? If you still have the "screw top" primer, change it. When they go bad, they allow air into the fuel system.

If it were my car, I'd make absolutely sure I had bubble-free fuel at the injectors before doing anything else.

Jay.

ashedd · #6 03-06-2011, 12:01 AM

The primer pump is a screw type, slightly different than my SD but both screw types. This primer does not feel like it even pumps any fuel. On my SD you can feel the fuel being pumped, even if it leaks out the bottom of the pump.

So is the only way to test the primer to replace it?

jt20 · #7 03-06-2011, 03:11 PM

which one is the 'suction' valve?

wouldn't both plastic valves have to be leaking?

tangofox007 · #8 03-06-2011, 03:19 PM

Quote:

Originally Posted by jt20

which one is the 'suction' valve?

Discharge valve is to the front, suction valve to the rear.

ashedd · #9 03-06-2011, 04:09 PM

no joy on the crows foot, tried three different places.

I will order a new primer pump, since both mine are the old style. Tomorrow I will attempt to remove the pump ass'y and see what I can do. Are there any words of caution in reference to loosing parts when I take the pump off?

I think my 300d will be ok to get me around town. There is a whine from the rear diff at speeds over 50.. I will stay away from the highway.

I hope it gets a little warmer out

whunter · #10 03-06-2011, 10:17 PM

Quote:

Originally Posted by jt20

which one is the 'suction' valve?

wouldn't both plastic valves have to be leaking?

Fastlane: REBUILD KIT, DIESEL LIFT PUMP/FUEL PUMP, DOES NOT INCLUDE THE LARGE PLUNGER SPRING OR LARGE PLUNGER COVER SEAL RING, APPLICATION: OM616.912, OM617, 910, 912, 950, 951, 952
http://catalog.peachparts.com/item.wws?sku=0000900210
pictures on install are here.
OM617.951 and .952 Lift pump Repair kit W126.120 300SD W123.133 300D
http://www.peachparts.com/shopforum/mercedes-parts-reference-library/183451-om617-951-952-lift-pump-repair-kit-w126-120-300sd-w123-133-300d-post1461282.html

ashedd · #11 03-07-2011, 04:38 PM

lift pump off. suction valve looks fine. I will get the rebuild kit and a new primer. I don't think I want to yank the lift pump off my SD.

ashedd · #12 03-16-2011, 04:27 PM

Replaced the primer pump and bought the "rebuild" kit from fastlane.

Same thing!!!

I am tempted to call a salvage yard and tell them to come get it. I got rid of two cars in two days, I am on a roll. Right now I am charging the batt since I ran it down. If it doesn't start and idle normally... well I dunno, but I am REALLY sick of messing with it.

Still on the hunt for a w124 wagon as a daily driver. Found some.. either not nice enough or too expensive.

ashedd · #13 03-16-2011, 04:52 PM

ok, now that I got that out of my system.

It's running fine off a container of kerosene. That is all I had laying around. I put a little oil in there for good measure.

So it seems the tank screen in clogged or something.

whunter · #14 03-16-2011, 05:39 PM

Quote:

Originally Posted by ashedd

ok, now that I got that out of my system.

It's running fine off a container of kerosene. That is all I had laying around. I put a little oil in there for good measure.

So it seems the tank screen in clogged or something.

We have a winner...

It's ALIVE...