Isx cm871 turbo issues

[Doodles_mmr]

(04-17-2023 )arazdolgin Wrote:  

(04-17-2023 )Nilao Wrote:  Demandated trucks need the turbo closing tables adjusted to produce positive pressure at idle otherwise the engine will create a vacuum and suck the oil past the seals.

Mine is not hooked up to the CAC and I started the truck and idled it for around 5 minutes. The passenger side of the engine compartment was sprayed with oil in the short time I ran it that way.

Open imap sensor and look if it vacuum sucking or blow air.

I’m on the same issue. Probably turbo rebuild again.

Also, check oil drain hose, air filters, position turbo at idle, oil you use, crankcase pressure or blowby pressure struggling oil to come out, air compressor.

I've checked all that. This is new turbo fresh outta the box thrusday. Fresh service with Rotella. Has the Crankcase filter that never has to be serviced on last turbo. All drains are good and clear. 38lbs of oil pressure at turbo inlet cold. Blowbye is almost none. And new air compressor when work was done a couple months ago. New oil coolers was done at same time. I know boost at idle is dead zero lbs via ecm reading. Starts showing boost parked at around 1100 rpm just idling truck up. Pressure tested CAC found no leaks.