Lost of blue smoke for a few seconds but only when started hot. (Page 2/2)
Dennis LaGrua NOV 07, 08:15 AM
What is the mileage on the engine??? Obviously a puff of blue smoke is oil entering the cylinders but the puzzling part is that your problem only lasts for a few seconds when starting not running. I would change the 30+ year old valve seals and see what results. This is not expensive and might save you in the long run.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Francis T NOV 07, 10:53 AM
To check your seals run it up, in say 2nd gear to maybe 4+K and then back off the throttle and watch your mirror for smoke and then accelerate. If the saels are bad it will smoke. good luck
Blacktree NOV 08, 10:02 AM
It's probably worn valve seals. But it wouldn't hurt to do a compression check first. I suggest doing the compression check first, because it would suck to remove and replace the head for the valve seal work, then find out you have to take the engine apart again to replace the piston rings.
cebix NOV 08, 02:29 PM
Thanks for the suggestions. Sadly I won't have time anysoon to work on the engine. But yeah if I'll be removing the head for a valve stem job I feel it would be best to rebuild the whole engine by the way.
cebix MAR 15, 07:22 AM
Bringing this thread back from the dead.

I rebuilt the engine last year and beside some other problems - this one stayed with me that I thought would definitely go away.

There's no more oil in the air filter, no puddling. Other symptoms remain - hot start wants to die, will often die in R or D without leftfooting the brake and giving it some throttle. Huge clouds of blue smoke for 10-15 seconds after starting hot. After that is running fine. Looks embarassing leaving gas stations to say the least. No oil consumption noted. Just 2000 miles done since the rebuild and ~1200 since the last oil change so can't really say for sure it's not eating oil.

The shop did a valve job and replaced the valve stem seals. And it's been smoking like that from my first hot start since the rebuild. Thought it's just a fresh engine thing but now I'm concerned. Should I look into it at this point or just let it ride some more miles? I'm doing a lot of short trips mostly commuting to work and the weather is cold and has been all the time since the rebuild in september/october of 2019 if that might mean something.

[This message has been edited by cebix (edited 03-15-2020).]

Dennis LaGrua MAR 15, 09:56 AM

quote
Originally posted by cebix:

Bringing this thread back from the dead.

I rebuilt the engine last year and beside some other problems - this one stayed with me that I thought would definitely go away.

There's no more oil in the air filter, no puddling. Other symptoms remain - hot start wants to die, will often die in R or D without leftfooting the brake and giving it some throttle. Huge clouds of blue smoke for 10-15 seconds after starting hot. After that is running fine. Looks embarassing leaving gas stations to say the least. No oil consumption noted. Just 2000 miles done since the rebuild and ~1200 since the last oil change so can't really say for sure it's not eating oil.

The shop did a valve job and replaced the valve stem seals. And it's been smoking like that from my first hot start since the rebuild. Thought it's just a fresh engine thing but now I'm concerned. Should I look into it at this point or just let it ride some more miles? I'm doing a lot of short trips mostly commuting to work and the weather is cold and has been all the time since the rebuild in september/october of 2019 if that might mean something.




Were the valve guide areas checked when they replaced the valve seals?

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

cebix MAR 15, 10:18 AM

quote
Originally posted by Dennis LaGrua:


Were the valve guide areas checked when they replaced the valve seals?



No idea. I think it _is_ possible that they might have only replaced the big intake stem seals and not the little rubber oring intake and exhaust ones. Would have to contact the shop about it but I don't think they will remember. The receipt just says that the valve stem seals were replaced. The engine was rebuilt in may 2019 but only put in the car and ran in september or october.

Anyway this was a total rebuild with new pistons, rings, bearings, new cam, etc. so I doubt they would miss a thing like that with a supposed total inspection of the engine. I also distinctively remember they calling me up _not_ to order new valves as they were good so I guess they inspected those thoroughly.

[This message has been edited by cebix (edited 03-15-2020).]