84 300sd Rough/Shaky Idle

Submitted by jjelonek on 15 August 2008 - 4:25pm.

I have an 84 300sd which I can't do anything to settle down the shaky engine during the rough idle. I ran 3 cans of diesel purge and that seemed to help while running Diesel Purge, but when back on WVO or diesel, the engine starts shaking. Is time to clean the injectors? What am I missing?

Air, fuel filters are new. Valve adjustment done. What next?

Thanks!

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889 reads

A new rack damper bolt sure

17 August 2008 - 12:59pm

oldsinner111

A new rack damper bolt sure made mine like a caddy.

Rough Shaky Idle

18 August 2008 - 3:36pm

Andrew Brubaker

I Have a 1983 cd and had a simular problem. First check to see if your moter mounts are in good condition, if not Replace them if so I have had good luck runing a botle of Marvles Mystry oil every other tank. Hope this helped

I have an 81 300sd which I

24 September 2008 - 8:47pm

titan1

I have an 81 300sd which I have tried everything with as well. (except the damper bolt) Mine.......seems like it is missing, even with new injectors, diesel purge, valves adjusted etc etc

It only seems to be doing the missing when cold ??? Could still be the damper bolt?

DIESEL PURGE

4 October 2008 - 4:19pm

RAYMOND485

1984 300D TURBO 147K
REPLACE THE LIFT FUEL PUMP ASSEMBLY $150.00, NOW HAVE GOOD POWER, INJECTORS DO NOT PLUG UP, GOOD MILEAGE, NO SMOKE, IDLE GOOD, 2 HOURS DIY, DONE

Raymond...........how did

7 October 2008 - 12:17pm

titan1

Raymond...........how did you decide it was your lift pump?

FUEL LIFT PUMP

8 October 2008 - 4:23pm

RAYMOND485

1984 300D TURBO 147K
THIS SITE WAS SELLING A ELECTRIC LIFT PUMP KIT $159.00 AND WITH A GOOD WRITE UP WITH ADDED POWER THE OTHER PUMP MUST HAVE BEEN WEAK LOW FUEL PRESSURE.
AIRPLANES DO HAVE A ELECTIC FUEL PUMP FOR BACK UP OF THE MECH FUEL PUMP USE FOR CHANGE FUEL TANKS AND TAKE OFF THE RUNWAY, I LOST FUEL PRESSURE IN TEXAS AND CAR STOP, A BACK UP PUMP WOULD HAVE HELP.

84 300D Vaccuum line question

23 October 2008 - 6:49pm

maxxsam

I have recently purchased an 84 300D, 110K excellent condition, always garaged. There is a small diameter black vaccuum hose comming thru the firewall in the center of the vaccuum cluster, under the steering column it is not attatched to anything, is it supposed to be? I was looking at a diagram, and it shows there is a vaccuum hose that does not connect to anything, is this true?

vac line

25 October 2008 - 2:42pm