I took off my alda and shutoff valve hoses and inspected them. there was a thin oily residue around the alda banjo from not being tightened down all the way and there was alot of pressure released from my shuttoff valve an hour after driving it.. the sluggish problem went away instantly not sure if its a bad shutoff switch or not... its been hard to start the first time after its warm but fires up instantly the second time i try it....

Try driving it without the brown shut off valve attached and see what happens. Shouldn't be any vacuum on that brown line when the engine is running. (I assume you mean vacuum and not 'pressure' in that line).

__________________
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1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
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1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

yeah thats what i meant... Could i have gotten the vacuum lines reversed when i replaced my ignition switch.. i replaced the whole unit into the steering column

I was using this as my referance

IP throttle rack jammed
I recently had a problem with my OM617 injection pump (from a 300D turbo) that I was able to solve after many many many hours of reading through this forum (especially the "won't start for anything" thread) and pouring over the MB shop manual. I'll summarize it here because I didn't find anyone else posting about the problem and this was the second IP I have come across with the exact same problem. Also, I didn't find anyone who tried the solution that worked for me which might save someone else a little time and others may be able to add their expertise.

Problem: absolutely no fuel flow through any of the IP hard lines. Lift pump circulates fuel through the IP just fine, but nothing will come out any of the injector lines whatsoever even at full throttle.

Diagnosis: IP throttle rack jammed shut

Fix: purge the IP with solvent repeatedly until rack frees up

Contraindications: can also be caused by air in the IP or by a defective vacuum-driven shutoff valve, or mis-configured ignition switch holding the shutoff valve closed. A worn/broken IP bypass valve spring can cause a similar condition though in that case at least a little fuel will usually flow through the hard lines.

The IP rack controls the amount of fuel that the pump delivers to each injector, in the fully closed position no fuel is delivered at all. Normally the running engine is stopped by the shutoff valve or the throttle arm pulling the rack all the way closed. The rack is in the front half of the IP and is pushed and pulled by a rod that extends through the bulkhead and into the rear half of the IP. (the rear half is filled with crankcase oil and contains the governor, the front half is full of fuel and contains the pump pistons). In this situation the rack jammed in the closed position when the shutoff valve pulled the pushrod all the way back.

The reason this can be such a problem is that the throttle arm (the part connected to the foot pedal) only acts on the rack via the governor, which is to say via a system of springs. They are not directly connected. Therefore any significant resistance in the rack cannot be overcome by forcing the throttle arm because it will only compress or release the springs in the governor without actually forcing the rack to move.



1. Visually confirm fuel supply by disconnecting the fuel return hose and pumping fuel into a container using the primer pump

2. Confirm lift pump operation by cranking engine and checking that fuel is still flowing into the container

3. Disconnect the vacuum lines to the shutoff valve to confirm it is not engaged.

4. Confirm there is no air in the IP by purging with the primer pump and bleeding the hard lines by cracking them at the injector and cranking the engine.

5. Check for normal movement of the throttle rack by visual inspection through the ALDA cover plate.

Good luck and thanks to all the many brilliant people who contribute to this forum without whom I would be so terribly lost!

Aloha,

-Kanoa

yeah i tried this when driving today and i got no pressure at all... i tried to snug up the lines too on the ignition switch to be sure.. and no pressure at all... problem is i can hear air if i unplug them after driving and it sets for a while...