1982 300D Mercedes dies under load

Was recommended by others to reach out to you for help. I own a 1982 300D that is stalling when under a load The car started stalling when I came to a stop. I figured it was a good time to park it and replace rear cv's. 3 weeks have gone by and I have been having starting issues ever since. I first replaced both the primary and secondary fuel filters, next drained and boiled out fuel tank, blew out fuel lines, removed, cleaned, and replaced 2 of the 5 injectors, checked for any vacum leaks, and lastly fiddled with injector pump adjustment. The car will at times start up but will not maintain an idle. If I bring the rpm's up to 1000 it will idle (rough not smooth as before), but when I place it into drive it idles very rough momentarly then dies. I am kind of out of what's next to do or have I done everything correctly the first time. I could sure use some professional advice to help me out of this particular dilema!? I'd appreciate your help if you can or willing too?

Matt Kirk

Hi Kent,

Been a while. I am somewhat still struggling with car. I have rebuilt and put new Monark injectors in. (2300/2150/2200/2200/2200 PSI ea). I removed exhaust runs better, but struggles when fan is on and when in gear it will staul. In fact, idle is set to high 1100 rpm's to do just that?! I have yet to check timing chain, don't know how to? Although I did valve job. There is no back fire so I can't see chain making all that much off a difference. Maybe?! When the motor is idling it almost looks as though it is swirling. That some injectors are getting fuel at odd times. At high idle motor doesn't miss a beat! I can drive down road but I have to use a 2 foot driving method. Have an idea how much it costs to check the IP? Or is it worth buying the one u have for sale on your site? Let me know if u can help or give some direction. It has been a project and would like to begin driving car again soon.

Thanks,

Matt Kirk
209-728-2671

Forums

Diesel Engine Specific Aid

Chassis Model Number

W123

Isolate your fuel and fuel system

Hi Matt, First off, have you done a valve adjustment, compression test, and checked your internal engine timing - this will confirm the internal health of your engine. CLICK HERE to read article on this procedure.

Also, check for any restriction in your engines intake or exhaust systems.

The best way to troubleshoot this type of problem is to isolate the complete vehicle fuel system and run the vehicle from an alternate fuel source. This will let you know if the problem is fuel system related or mechanical in nature. At the same time you should flush your fuel injection system to eliminate the possibility of any obstruction or contamination.

This can all be done at the same time by running our Diesel Purge Product through your engine. We sell a complete kit with instructions. CLICK HERE to order.

If you do the purge and the problem still persists then you most likely have a failed lift pump or fuel injection pump. Let us know what your discover.

Kent Bergsma

Kent, Ordered Diesel Purge

Kent,

Ordered Diesel Purge and will take it from there.Will let you know how all goes.

Thank you,

Matt

300D 1982 Rough and unsteady idle

Kent,

Diesel purge did wonders! The car sounds quieter, but still won't hold idle and is rough. Did compression test all 5 cylinders ranged btween 300 and 305. Is that o.k? I cranked engine only 8 revolutions per with the engine being cold. Is that correct? Have ordered injector rebuild/test kit w/Monarks and new fuel pump by Monark. Let me know about compression and I will let you know out come as I rebuild and replace. I am in hope and pray I will not have replace the injection pump!!!Thanks for the (2)80 amp fuses.

Thanks,

Matt Kirk
sharaandmatt@comcast.net
209-728-2671

Was it stalling when running the purge?

Matt, when you were doing the actual purge did the engine still stall on you with rapid acceleration.

300 is ok compression especially since the cylinders are all pretty even. It is a the lower end but should not affect idle or acceleration. When you pull your old injectors bench test them BEFORE you take them apart. This will indicate just how bad or good your old injectors have been firing.

Kent, The engine did not

Kent,

The engine did not stall with purge at rapid acceleration. When the kit arrives I will test stock injectors and get back to you. By the way, was the compression test done correctly? (engine cold and crank engine 8 revolutions). Was I to remove glow plugs as well? Or anything else?

Matt Kirk

1981 240D can you put together an engine rebuild kit?

Have you thought of offering complete kits, rods and main bearings pistons and rings, oversized if neccessary, or liners, timing chain, tensioner and guides, gaskets and seals. You know these engines far better than most, whatever replacement parts you deem as common. And rebuilding all it's components.

1982300D Mercedes dies under load

Kent,

Removed lift pump, is there a way to test it? Rebuilt it?

Matt

Mat / Kent, Having same

Mat / Kent,

Having same exact problem with my 85 300td. I have done most of the same; fuel filters changed, Mercedessource diesel purge (both cans), compression test, valve adjustment and had our local vintage MB specialty shop check injector pump. He wants to replace injectors but unsure what will work. Here is the real kicker...I converted it to a 2 tank Greasecar WVO 1 year / 17,ooo miles ago with no problems. When I switch it over from the diesel fuel to the WVO, it runs as smooth as before the petroleum diesel fuel idle issues. Both my MB specialist and I are perplexed and interested in your resolution. Will keep you posted if we figure it out.

Frank