Hello guys.

Recently a blown my turbo 6266 The thing is, I bought an used turbo from a guy and told me its was a 6266. When I installed the new turbo, the car begins to run rich in idle, and the only thing that I change was the turbo.

My question is, can the turbo to influence in a rich idle? The afr is on 10.8-11.1.

In appearance the turbo looks like a 6266, even bigger. The old turbo was journal bearing. The guy that sold to me said the turbo was journal, but when I turn off the car, the turbo stay a lot of time spinning. I think its ball bearing because, I never felt that the old turbo was spinning a log time like this.

I dont know what can we do for rich idle. I change the MAF, new spark plugs, coils, temperature sensor.... but the car still the same.

One more thing, yesterday, when I drove the car from the shop to my house, idle always rich, and when acelerate the car run lean. I look the fuel pressure regulator and shows 17 psi, when normally its in 40-50 psi.....
Now, all the evils are coming to the poor car....

 

Sounds like a leak after the MAF sensor aka unmetered air. Do a boost leak test forsure.

As far as the fuel pressure. Thats another story. Maybe throw a different guage on it to make sure its really 17 psi. I dont know that it would run on 17

 

I forgot to mention, the car has not leaks , no vacumm, etc...

 

Did you do actual boost leak pressure test? or did you just visual it

 

I made a boost leak test. minimal leak and solved.

Not big deal for have the rich afr in idle.

 

Problem solved...
The problem was the Slotted anti surge compressor cover of the turbo..
After change for a drilled anti surge cover, the afr put normal in idle 15-16 afr (kelford cams). I think the MAF read different with a slotted cover, although my tuner said the slotted its better but I need re scale the maf sensor I think...

Slotted cover its on the top and drilled anti surge cover is down.