04-25-2011, 11:56 AM
|
|
10mm MW
|
|
Join Date: Sep 2008
Location: Michigan
Posts: 794
|
|
Quote:
Originally Posted by wordmanjay
Completely new car to me. I haven't done a thing.
It is rigged to run on veggie.
|
All the comments so far are good things to check / verify.
Given that this is a new car to you, if after you have verified that the linkage is not hanging up, I would recommend the next thing to try, as the other member mentioned, is to back off the Vertical Throttle Stop about / at least, 4 turns and see if that stops the worm engine revving. The Vertical Throttle Stop is vertical screw with a lock nut, that is located between the engine and the IP and is what the throttle lever contacts when the throttle is in the Idle position.
If the Idle Governor, (an internal setting), is not set properly, as is the case for 240Ds, the Idle Governor Spring does not have enough tension to maintain a strong idle when the engine is cold, and the first thing everyone does to raise the idle is to turn in the Vertical Throttle Stop, increasing the Throttle input, in an effort to strengthen the cold Idle.
The problem with using the throttle to maintain an Idle speed is the throttle does not modulate. Because the throttle is now, pushing on the flyweights in addition to the Idle Governor, (helping the Idle governor), any change, or regulation of speed, must be a collaborative effort, however the Throttle does not modulate, so when the Idle speed starts to exceed the regulated range, the Idle governor will try to reduce the speed, but the Throttle will hold it from dropping enough to reduce the idle to the desired speed. When it is cold, the engine needs a touch more fuel to idle, but when the engine is worm, that same amount of fuel will cause the engine to rev up.
If the Idle Governor is set properly, you should be able to back off the Vertical Throttle Stop at least 5 full turns and the idle speed should not change very much. What should change is how quickly the engine returns to idle when it is revved up.
If, the idle speed is DEPENDENT on the throttle, then the Idle Governor spring tension needs to be increased so it is strong enough to regulate the idle speed in both warm and cold conditions. The problem is, the Idle Governor Spring Tension screw is inside the governor, behind the back cover, and the setting is easy to mess up.
First things first. Fingers crossed.
|
Hybrid Mode
