OM606 EDC 7.7mm swap issues
OM606 EDC 7.7mm swap issues
The swap and other things went well since this is not my first time changing elements but now it hunts a lot at idle, it has a massive lobe and blows black smoke every time it lobes.
The transmission doesn't want to shift and when it does it's extremely violent. At full throttle it works perfectly, shifts good and has faster 0-100 than stock pump without increasing boost. Cruise control speeds up and downs constantly on it's own so it's unusable.
At part throttle driving the transmission flares massively and won't go into the next gear, it's pain in the ass to drive it like this.
I have never done any ECU work on a mercedes and I know I have to buy a new IC and device to write onto the IC to make a new program for the car.
What should my next course of action be for getting the car working good again?
Hi, I swapped dpuk 7.7mm elements into an om606 edc pump, I calibrated it withing 2cc injection quantity at 100cc. It's a stock W210 otherwise.
The swap and other things went well since this is not my first time changing elements but now it hunts a lot at idle, it has a massive lobe and blows black smoke every time it lobes.
The transmission doesn't want to shift and when it does it's extremely violent. At full throttle it works perfectly, shifts good and has faster 0-100 than stock pump without increasing boost. Cruise control speeds up and downs constantly on it's own so it's unusable.
At part throttle driving the transmission flares massively and won't go into the next gear, it's pain in the ass to drive it like this.
I have never done any ECU work on a mercedes and I know I have to buy a new IC and device to write onto the IC to make a new program for the car.
What should my next course of action be for getting the car working good again?
X Double Dot
02-17-2025, 01:56 PM #2My guess is that whatever PID loop parameters the stock ecu uses for rack control and idle control doesn't work with the larger elements. I don't know what stock ecu tuning is available. I will say I personally use the DSL1 and would imagine you'd be able to get the pump under control with all the tuning parameters it offers.
Today I adjusted the rack position sensor and took it out as far as possible. This made a very large difference. The engine now idles normally, gear box function is way better. Only hunts a little bit when coming back to idle but there is still something I would like to do to get it as good as with 6mm elements
X Double Dot
02-18-2025, 09:06 AM #4any chance you can share how to do that? i couldn't find any instructions or writeups online about how to do that
X Double Dot
02-18-2025, 10:41 AM #6thank you. any guidance on how specifically to adjust it? loosen or tighten until ___ happens?, do you do it with the engine running?
Then I put the governor back and used a hex key to loosen the bolt inside, after loosened you can move the rack position sensor back and forth, towards pump too much stopped engine from running but taking it out as far as it went made it run way better with 7.7mm elements. I guess with 6mm or properly tuned ecu with bigger elements the position matters and can be fine tuned. I don't know why you would touch it if you have a stock pump though. I had the engine running or off at times and didn't seem to matter.
The plug on the back of the pump was hard to remove with the pump on the engine so I just took the governor off and still struggled to get the plug out so I drilled a screw into it and pulled it out with that, It's just a plastic plug to stop oil from coming out of there and the screw wont go through completely since it's quite thick.
Then I put the governor back and used a hex key to loosen the bolt inside, after loosened you can move the rack position sensor back and forth, towards pump too much stopped engine from running but taking it out as far as it went made it run way better with 7.7mm elements. I guess with 6mm or properly tuned ecu with bigger elements the position matters and can be fine tuned. I don't know why you would touch it if you have a stock pump though. I had the engine running or off at times and didn't seem to matter.
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