Detroit 60 series 12.7 cuts power

check engine data related with engine protection.

can you read engine protectiona data with DDDL?

Is it DEEC-V? read engine parameters? try to disabel engine protection parameters one by one till you find the problem.

Check EGR data, especially Delta pressure sensor for wrong reading. Try to dive with disconnected delta sensor.

check VSS, ABS. I had the same issue with Volvo. tires of diifferent brands and wrong rear ABS sensors speedo reading. ABS/ASR compares vehicle speed and rear axe speed and cuts power via ASR function. Try to disable ASR with Wabco Toolbox

 

I have the same problem with my 98 DD s60. I'm taking it in to the shop tomorrow in the afternoon. Will keep you posted.

 

your engine is w/o EGR. usually low fuel pressure issue.

his engine is with EGR. sometimes EGR does keeps open for some seconds, and delta sensor reads flow of exaust gas and limits fuel to avoid smoke. then when EGR is closed fully ECM adds fuel and engine revs up. and it is usuall thing when ECM stores no codes. We call it lazy EGR issue. Usually ash deposits inside.

to be sure I do test rund with computer in cabone and carefully look at EGR flow reading.

Infortunatly there is no fuel pressure sensor on DD60 (like on Volvo).

 

I learn something new every day.

What about a fuel injector problem?

 

the only way - measure fuel pressure.
I do it with gauge on hose. I put it under the wiper and drive up a hill. I can see fuel pressure drop!

Volvo engine unit monitors fuel pressure and stores codes. DD - not! So gauge may help you!

 

I know this is a old post but I was having the same problems I found out on mine it was a injector cup was leading coolant in cylinder 6 hope that help everyone that’s looking for this problem

 

Bud I’m having same problem I don’t know if that’s the problem

 

Can you Elaborate abit more how or when your issue seems to act ?