C63 no power after 5000 revs

[Walshy69]

hi,
lm after a little advice if possible.
I have a 2017 C63 which I have changed the engine in due to water damage of the previous engine. All has worked well and the car performs really well. As part of the engine swap I used a GLE63S engine and swapped the sump over.
The GLE engine loom did not have a plug for the oil temp sensor so the car does not know how hot the oil is. My assumption is that the car will cut fuel at 5000 revs to keep the engine safe as it thinks that the oil is not hot enough.
Is my thinking correct ?
Also i know I could fit the old wiring loom but don't really want to take the engine back out to do it.
If my assumption is correct is there any way of reprogramming the ecu to make it think that the oil is always at operating temperature ?
Thanks.

 

[Uncle Benz]

You've decided not to route the wires then?

 

[GAD Tuning LTD]

hi,
lm after a little advice if possible.
I have a 2017 C63 which I have changed the engine in due to water damage of the previous engine. All has worked well and the car performs really well. As part of the engine swap I used a GLE63S engine and swapped the sump over.
The GLE engine loom did not have a plug for the oil temp sensor so the car does not know how hot the oil is. My assumption is that the car will cut fuel at 5000 revs to keep the engine safe as it thinks that the oil is not hot enough.
Is my thinking correct ?
Also i know I could fit the old wiring loom but don't really want to take the engine back out to do it.
If my assumption is correct is there any way of reprogramming the ecu to make it think that the oil is always at operating temperature ?
Thanks.

I would highly recommend taking engine out and using correct wiring harness

 

[Walshy69]

Guys, thanks for the advice which is valid.
However, if the GLE63S had an electronic oil temp and level sensor, is that the one in the bottom of the sump, and since I have the GLE63S wiring harness if I change the sensor will the oil temp start to display ?

 

[Uncle Benz]

I have no idea. Maybe plug the loose sensor into the plug first, see if the dash reads something

 

[Craiglxviii]

What the guys at GAD said^^^

Don’t try to second guess engine wiring. Just not worth it.

 

[ajlsl600]

There must be a way to send a normal oil temp signal to the ecm.
However this could leave you with a later issue should yr oil temp really get to hot.
Or you fit a good old oil temp guage. How practical this can be around ur dash I dont know and cutting things about around dash not great for resale value.

 

[Walshy69]

Hi All,
Quick update on the no power past 5000 revs.
So I finally bit the bullet and decided to wire back in the oil temp sensor to the engine loom.
This required the front end of the car to come off to gain access to the multi plug that connects to the ecu. Two new cables run from the oil temp sensor on the oil filter housing back to the multi plug. One wire re pinned to the same position as the original loom and one connected to the power wire - all not possible without assistance from a great new friend who helped me every step of the way, cheers Lee.
While we were that deep into the job it seemed only right to have the ecu reprogrammed with a stage 1+, so thanks to LJ Mechatronics in Liverpool we are now running with 600 bhp.
Alot of work but so much fun past 5000 revs and more power from the reprogram.

 

[Uncle Benz]

Brilliant! Pleased you managed it. I think that was my suggestion from the word go on your other thread!

https://forums.mercedesclub.org.uk/index.php?threads/c63-engine-transplant.184409/#post-1855985

 

[Walshy69]

Yes you were spot on.

 

[Uncle Benz]

They are superb cars. I have my own one tuned by Anthony at GAD to a similar level. How I haven't lost my licence I'll never know!
How did the original engine fail? I've heard they can be prone to water ingestion from splashes thrown up by other cars in deep standing water.

 

[Walshy69]

I bought the car with a water damaged engine. I was told that the car had entered a large puddle and taken water into the engine. There was no water damage anywhere else on the car, so yes I guess they are susceptible to water ingress in the engine