is this blown turbo seals?

[vintagemuscle]

I've had the same problem. No leaks but the turbo seals, with alot of the air escaping out of the valve cover.
If you haven't already, try leak testing the car when it is at operating temperature. For me this seemed to help it not having as much air going to the crankcase. i figure it helps because there is some oil still left in the turbo that helps seal the air from escaping. when actually boosting the car i'm sure the oil in the centersection is stopping most of the air from escaping.
I was seeing 8-9in vac at idle before i rebuilt my head and am now seeing about 12-14in hg with my 272 cams. This should be an acceptable number since i'm running large cams. i wasn't seeing any black smoke indicating valve seals but once i put the new head on everything seemed all good.
I would recommend a leakdown test as a top priority as previously stated before pulling the head off to find it's not your problem. Good luck

 

[dnhieu]

David.

No worries and no offense taken. You're referring to testing for boost leaks and I'm talking about vacuum leaks. Vacuum leak tests need to be done with the motor running at idle and warmed up. It's a matter of spraying carb and choke cleaner around all of your vacuum lines on the intake manifold, TB, brake booster, FPR, etc. You don't go near the intercooler pipes. If you detect a stumble or a change in idle, you need to replace that particular line or re-check the connection.

Know what I mean Vern?

Andy

thanks man for further explaniation. i will do this tomorrow...

 

[dnhieu]

I've had the same problem. No leaks but the turbo seals, with alot of the air escaping out of the valve cover.
If you haven't already, try leak testing the car when it is at operating temperature. For me this seemed to help it not having as much air going to the crankcase. i figure it helps because there is some oil still left in the turbo that helps seal the air from escaping. when actually boosting the car i'm sure the oil in the centersection is stopping most of the air from escaping.
I was seeing 8-9in vac at idle before i rebuilt my head and am now seeing about 12-14in hg with my 272 cams. This should be an acceptable number since i'm running large cams. i wasn't seeing any black smoke indicating valve seals but once i put the new head on everything seemed all good.
I would recommend a leakdown test as a top priority as previously stated before pulling the head off to find it's not your problem. Good luck

so what was it the turbo or the head? i see 11 vacumme if the car is warmed up or cold. my fuel trims are peg rich at 82%. i am leaking air somewhere in the system and my ecu is compensating by adding a shit load of fuel for it. i have a stage 3 chip and im still taking out about 40% of fuel between the safc and the maft to compensate and im STILL pig rich. i wont take any more out without a wide band BUT this is how much i gotta take out in order to stop the stumbling. i will buy a leak down tester on friday and keep everyone informed again...

thanks again for the help guys
david

 

[DSM90AWD]

did a compression test and the numbers were not all that good or the same 160-160-160-145. found out that the #1 cylinder had a bad arching issue witht he coil pack resulting in lower compression numbers i believe

A compression test is performed minus spark and fuel (MPI fuse removed) to the measured cylinder. What would an arcing coilpack have to do with anything

Had my morning coffee and had an epiphany

e·piph·a·ny A sudden manifestation of the essence or meaning of something

Is you boost/vac gauge working correctly? Where is it connected? Do you have access to a miti-vac to independently test its boost/vac readings?

 

[vintagemuscle]

so what was it the turbo or the head? i see 11 vacumme if the car is warmed up or cold. my fuel trims are peg rich at 82%. i am leaking air somewhere in the system and my ecu is compensating by adding a shit load of fuel for it. i have a stage 3 chip and im still taking out about 40% of fuel between the safc and the maft to compensate and im STILL pig rich. i wont take any more out without a wide band BUT this is how much i gotta take out in order to stop the stumbling. i will buy a leak down tester on friday and keep everyone informed again...

thanks again for the help guys
david

well, all i can tell you is that it was not the turbo seals causing my problem. all i did was rebuild the head and the symptoms cleared up. my fuel trims were also all full rich down in the 80% area. when i tried resetting the fuel trims the car wouln't run without pushing the accelerator to keep it running. this is when i decided to just pull the head. sorry i can't give you any real answers.
you will most likely figure out the problem once a leakdown test is performed.

 

[dnhieu]

A compression test is performed minus spark and fuel (MPI fuse removed) to the measured cylinder. What would an arcing coilpack have to do with anything

Had my morning coffee and had an epiphany



Is you boost/vac gauge working correctly? Where is it connected? Do you have access to a miti-vac to independently test its boost/vac readings?

Sorry man. i knew i should have rephrased it better. the coil pack was a whole diffrent problem BUT the cylinder that was low on compression is the same same plug on the coil pack that was messed up. is my compression all that bad?

 

[dnhieu]

well, all i can tell you is that it was not the turbo seals causing my problem. all i did was rebuild the head and the symptoms cleared up. my fuel trims were also all full rich down in the 80% area. when i tried resetting the fuel trims the car wouln't run without pushing the accelerator to keep it running. this is when i decided to just pull the head. sorry i can't give you any real answers.
you will most likely figure out the problem once a leakdown test is performed.

thanks man, your help is really appreciated. im gonna buy a leak down tester to try to find the problem. hopefully i dont have to pull the head but i will if i need to fix this problem. its gonna be so damn nice once i start pulling the proper vacuume and my fuel trims settle down so i can haul ass like the rest of you...