[_Dirty_]

Hi All,


I am having issues with warm idling, I have researched to find that I will need to clean the AAV and possibly adjust the idle screws however for the life of me I cannot find any information on where they are.

Probably a bad sign that I'm trying to adjust them and cant find them but any help would be appreciated. and possibly any other insight.


Thanks,

Gary

 

[gafitanu]

Carburetor or injection? You have to be more detailed on the behavior of the warm up. What is AAV?

 

[_Dirty_]

Carburetor or injection? You have to be more detailed on the behavior of the warm up. What is AAV?

Injected.

Auxiliary Air Valve

On warm start, the engine seems to be not wanting to turn over, once I give it enough fuel (by pressing Gas peddle down and then feathering) it eventually turns over but if I don't continue to provide gas to it the idle will drop down and it will stall out. The interesting part is that once I get it in gear without stalling and drive it for 5 minutes it starts to idle just enough not to stall.

 

[gafitanu]

There are 2 ways to start these engines.
Cold - turn the key and at the first couple of explosions press the accelerator.
Warm - turn the key with the accelerator 1/2 way down (more or less).
This is actually from the MB manual.
If the problem is with the Warm Running Device. The AAV has an air filter mounted sideways that you can unscrew easily. When the engine is stalling check to see if there is any suction there. If there is it's not good. With engine cold there should be strong suction there (to the point that if you close it with your finger the engine will stall) and it should disappear completely in a couple of minutes. May not be a bad idea to unscrew the WRD, separate the thermostat part, check it for extension in hot water, disassemble the AAV to make sure everything is sliding well there.
At idle separate the IP rod from the crossover shaft. Push down about 1/4" on the rod, if the rpm increases your idle is lean. Turn the IP idle screw 2-3 clicks CW (WITH ENGINE OFF you have to push the knob until it seats into a screw slot) and see if it improves. Now push the crossover shaft 1/4". If the rpm increases your idle is rich. Turn the IP idle screw 2-3 clicks CCW. You can check the plugs color but that would be an overall mixture indication (mostly driving), white-lean, brown-OK, black-rich.
When stalling you can also try to adjust the manifold idle screw. If it makes no difference then it is clearly lean.
Forgot your original question:
There is only one idle screw and it is located on the intake manifold very close to the cylinder head and to the front of the engine (see first pic).
The IP idle screw is only for idle mixture adjustment (second pic).

 

[_Dirty_]

gafitanu - thank you so much for the write up. I'll try the startup recommendations, I'm honestly hoping that its simply just that. regardless if the idling issue persists ill check the air and fuel adjustments. Either way I'll report back.

 

[kdjones99]

If you're going to adjust the idle mixture screw on the injector pump make sure you do it with the engine off. You can wreck the pump if you adjust while running.