SmoKen on decel 92 IROC R/t
Well, Looks like the car has bad valve seals. No smoke at Idle or accell. Downshift coming to a stop to hear the exhaust note and I get smoke. Engine Rebuilt 5k ago. I'll do a compresson test to check the ring seating. Head rebuilt as well.
Car went through 2 quarts in 5k miles. Valvetrain not my area of expertise. What is invloved in fixing this?
Re: Smoke on decel 92 IROC R/t
Ken, valve seals are not cheap for this engine so you want to make sure it's them before you go ripping them out.
Remember at SDAC my car was doing that? Everyone kept telling me my car was smoking, I had only a few hundred miles on a fresh engine at the time and I thought I might have to rip it back apart. Turned out to be the turbo.
Re: Smoke on decel 92 IROC R/t
I agree on the turbo
glhs was doing the same thing
fine idling and under boost , smoked under decel
changed the low mileage head for a fresh head same thing
turned out the vac. in the exhaust stream was pulling the oil though the turbo
Re: Smoke on decel 92 IROC R/t
Im guessing turbo as well. Check and see how much axial play the shaft has....
Re: Smoke on decel 92 IROC R/t
Had similar symptoms on an 8 valve GLHS, and after changing valve seals and messing with it for a week it ended up being the turbo.
Re: Smoke on decel 92 IROC R/t
Pull the plugs and look for signs of oil, also look in the bores with a pencil type light and look for clean spots on the pistons at 12 and 6 oclock. If pistons are completely black, then its valve seals/guide or turbo, if clean, rings.
Re: Smoke on decel 92 IROC R/t
Quote:
Originally Posted by
Turbo3Iroc
Ken, valve seals are not cheap for this engine so you want to make sure it's them before you go ripping them out.
Remember at SDAC my car was doing that? Everyone kept telling me my car was smoking, I had only a few hundred miles on a fresh engine at the time and I thought I might have to rip it back apart. Turned out to be the turbo.
I was going to say turbo as well. My VNT would do this sometimes on decel, and mostly on decel after it would boost some to alot. Excessive *thrust* play is what I found.
Check your turbo, 1st.
Re: Smoke on decel 92 IROC R/t
Quote:
Originally Posted by
Lotashelbys
Im guessing turbo as well. Check and see how much axial play the shaft has....
if the turbo was bad, would there be large amounts of oil in the intercooler and piping as well?
Re: Smoke on decel 92 IROC R/t
there's always oil in the intercooler plumbing...but what is considered large?
Re: Smoke on decel 92 IROC R/t
Thanks... After getting under it this morning, Here is what I found...
#1 People need to ORIENT their hose clamps better. Had a coolant hese that theclamp was loose and IMPOSSIBLE to get to...
#2 These T3 turbo's are WEIRD... backing plate behind the turbine... Crusted with oil, leaking down the drainback tube... Hmmm looks like I found my leak as well. Sad thing is, this is a fresh rebuild... Nothing but new for me from now on
Thanks folks... Decided to look at swapping the turbo, on a TIII I've heard the turbo comes off easier than a TII without removing the head, any tips??
Re: Smoke on decel 92 IROC R/t
OK... Since you ALL seem to think the same thing (dammit) what turbo?? Going new... I'm tired of rebuilts....
Re: Smoke on decel 92 IROC R/t
I don't think you can get a 'new' TIII turbocharger. If you are going to get new, I would suggest a Turbonetics T3/T4 hybrid. Although that will cost a lot considering you'll have to revamp your downpipe and wastegate setup.
Re: Smoke on decel 92 IROC R/t
Quote:
Originally Posted by
rich tideswell
if the turbo was bad, would there be large amounts of oil in the intercooler and piping as well?
Yes and no, if its just leaking out of the exhaust side, it will just get put into the exhaust and burned.
Quote:
Originally Posted by
GLHSKEN
Thanks folks... Decided to look at swapping the turbo, on a TIII I've heard the turbo comes off easier than a TII without removing the head, any tips??
Its cake, just unbolt the lines, soak the nuts with penetrating oil and remove. I need short wrench for one bolt but my turbo sits back more than an R/T.
Quote:
Originally Posted by
GLHSKEN
OK... Since you ALL seem to think the same thing (dammit) what turbo?? Going new... I'm tired of rebuilts....
I would go with a nice Stage II, super 50 trim hybrid, and I don't believe FM is selling the elbow assembly anymore, so the DP will have to be redone. I would consider selling mine but I might need it for my R/T, ;)
Re: Smoke on decel 92 IROC R/t
Quote:
Originally Posted by
turbovanman
Yes and no, if its just leaking out of the exhaust side, it will just get put into the exhaust and burned.
Its cake, just unbolt the lines, soak the nuts with penetrating oil and remove. I need short wrench for one bolt but my turbo sits back more than an R/T.
I would go with a nice Stage II, super 50 trim hybrid, and I don't believe FM is selling the elbow assembly anymore, so the DP will have to be redone. I would consider selling mine but I might need it for my R/T, ;)
I missed the pat where you picked up an R/T. How long ago was that and what shape?
Re: Smoke on decel 92 IROC R/t
Ken, just inspect the original turbo before making any decisions.
Re: Smoke on decel 92 IROC R/t
Quote:
Originally Posted by
GLHSKEN
OK... Since you ALL seem to think the same thing (dammit) what turbo?? Going new... I'm tired of rebuilts....
Well, if you're looKen for a turbo...I think your old buddy Larry in Florida had one that worked for him...he he he
Re: Smoke on decel 92 IROC R/t
Quote:
Originally Posted by
Directconnection
I missed the pat where you picked up an R/T. How long ago was that and what shape?
I got the one locally, fastforwards 91 White Spirit R/T. It has bad paint peel but big whoop. Its missing the head, cams, rocker arms but everything else is there. Its lowered, adjustable panhard bar, short throw shifter, 2.5 inch mandrel bent cat back exhaust. Interior is mint, so I'll use my spare stuff to put it back together, keep it basically stock and it will be the wifes summer car and she want's to drag race it, :amen:
I'll keep it close to stock now but putting stage 1 cams in. Maybe later, bigger turbo etc.
Re: SmoKen on decel 92 IROC R/t
The S60 is always a nice selection...
Re: SmoKen on decel 92 IROC R/t
Re: SmoKen on decel 92 IROC R/t
I wonder if you can buy a new Buick turbo then swap the exh housing? That's where the Super 70 came from right? That was a nice street turbo before it went out on me.