Turbos blown?

[mikes_ca]

Hi Everyone,

I was driving along today and all of a sudden lost all boost after a medium push to 5000 rpm. The engine continued to run fine, but no boost, and then wouldn't rev past 4000 rpm. When I pulled off the road the car stalled and I haven't tried starting it again since. Looked under the hood and found oil leaking from the twin turbo pipe. The car is mostly stock, stock turbos.

I could use some help diagnosing things before I start buying parts and tearing into things. Any help is appreciated.

Mike

[NismoS-tune]

Hmm. The intercooler pipes, due to the shape, like to blow off and cause the same kinda of issue (minus the oil leak lol). Take a look.

[mikes_ca]

Thanks for the input. I'll certainly check the intercooler pipes. Hadn't thought of that as I was focused on the oil leak.

Mike

[jonesy]

How much oil? The rear turbo tends to blow a little oil back into the piping due to a something or other recirc, so a little oil isn't that unusual...

[mikes_ca]

It is just a little and from the rear turbo only. I haven't had time to tear into it yet but I'm thinking that since there is oil from the rear turbo there was obviously a leak there. Crossing my fingers it's just a hose clamp that came loose.

Mike

[mikes_ca]

Alright, had a better look at things today. Checked for codes, showed 55, nothoing. Started it up, ran fine to begin with, but then struggled to get to 4000 rpm. Also started to see some smoke, sort of white but hard to tell, and it only made smoke when letting off the throttle.

Checked out a few things with the MAFS as it seemed to be running rich. Unplugging the rear maf resulted in the car dying immediately, though unplugging the front maf just upped the idle and the car ran along fine. Is one of the mafs primary? Even tried changing to two older mafs I have to eliminate the maf as the reason and it still died when the rear maf was unplugged. Maybe a wiring issue?

The car managed to make 0.8 lbs of boost under no load while just testing the mafs, not sure what that means but the turbos must be spinning.

Again any advice would be great.

Mike

[DarkCaporaL]

Did you check your piping for a boost leak as suggested?

[mikes_ca]

I did check the intercooler piping and have not been able to find any leaks on visual inspection.

Given the smoke being produced when lifting off throttle I did a leak down and compression test - not good. 103-93-106-129-152-155. The leak down pointed towards leaky rings on cylinders 1-3. Spark plugs from cylinders 3 and 4 were very black the rest not too bad but not great. This still doesn't explain the lack of boost, but I guess I'll be rebuilding or finding a replacement engine.

Mike

[ooter]

i can almost guarantee you its a blown hose. so make sure you check all your hoses before you do anything else