jonteh

Hello everyone! Im trying to help my friend with his C63s m177. It is tuned with bigger turbos, downpipes, spool performance fx-150 hpfp and a lpfp. The car har been working fine until now. It cuts all power on full throttle but only when hot and sets P1CCB The Quantity control valve (cylinder bank 2) - has a short circuit to positive. Has anyone seen this before? His tuner is no longer working so we cant ask him for help anymore.
I was thinking about switching sides on the fuelpumps to se if the code sets on bank 1 instead.
Any help will be much appreciated thx.

Osgee

Quantity control valve I think that commands the waste gates

Does his car still rev just no boost

jonteh

Okay maybe thats why it cuts the power...
No it cuts the power on WOT and high rpms, it feels like when you let your foot off the throttle completely then you can give it again with no problem until it reaches high rpms then it cuts as before. And the code is back again.

koifysh

Keep me updated! This is interesting

Osgee

You need to have a look at the live data to see what it's doing

jonteh

Switched sides on the quantity control valves and the fault is even worse now. Now it cuts all the time on WOT but the code is still on bank 2. Do anyone have a wiring diagram for the quantity control valves?

jonteh

This issue is now fixed! It was the fuelpump failing, FX-150 Spool Performance HPFP.
It lost 30-60 bar of fuelpressure suddenly on WOT, replaced the pump with a spool FX-170 and the issue is gone.

Osgee

Have you sent the fx150 back for review ?

jonteh

No not yet, waiting for information from them where to send it.

SJGetsome

Curious to know if the FX-150 pump was falling or if the motor was demanding more fuel than it could supply, resulting in the issue. If you could update once you know that would be great.

jonteh

The ecu was demanding 180-220 bar and sometimes on wot the pressure droped below that and the car cut the power. This was on Bank 2 (driverside) the pressure on Bank 1 was steady on 205-215 bar.