Blue smoke vs gray smoke - oil vs fuel
#31
The ap1 has poor valve cover baffling which is more prone to allowing oil to splash through and enter the front breather and get combusted, but most report this on left hand turns on the track which doesn't sound like your issue, but thought id mention it anyway. The ap2 valve cover baffle was improved and ive never personally experienced this on the street or track but some have still. Ive heard of running the supra pcv before, back in the day I even ran one myself, but it was for boosted applications to help hold the added positive pressure the stock ap1 plastic one couldn't. In NA form i'm not sure what the thinking is since your not making any positive pressure.
Last edited by s2000Junky; 02-21-2018 at 10:41 PM.
#33
Good luck with that. It was looking good here a week ago. I pulled mine out of storage and drove it home to my garage on a sunny dry, but cold, day. Literally the next day we got another 3 inches of snow and they laid salt all over the roads again after it had pretty much all washed off. No end in sight. Ugh.
#34
Any news?Same exactly problem.Jdm f20c motor with 100k miles on it.Changed seals,guides but nothing happened.Compression test 225 all 4.It burns 1.5 qt per 3k miles with normal driving.I'm ordering penzoil platinum 10w30 to see if something is going to change(tryed the amsoil sgt 5w50 but didn't notice any dramatic change).The mechanic diagnosed "oval" cylinder walls when we took off the head for changing the valve guides.But my question is,why it isn't smoking if i drive it hard,or driving on the highway?Only at traffic situations and when i take off a traffic light or when decelarating for some time and then hitting the gas
#36
Any news?Same exactly problem.Jdm f20c motor with 100k miles on it.Changed seals,guides but nothing happened.Compression test 225 all 4.It burns 1.5 qt per 3k miles with normal driving.I'm ordering penzoil platinum 10w30 to see if something is going to change(tryed the amsoil sgt 5w50 but didn't notice any dramatic change).The mechanic diagnosed "oval" cylinder walls when we took off the head for changing the valve guides.But my question is,why it isn't smoking if i drive it hard,or driving on the highway?Only at traffic situations and when i take off a traffic light or when decelarating for some time and then hitting the gas
Last edited by zeroptzero; 05-13-2018 at 04:43 PM.
#37
I have no cat(test pipe).But i don't think it's fuel what i see and what i smell.It's oil for sure.Also it consumes enough oil for normal driving.I'd expect to see smoke all the time and especially in vtec with broken rings but it doesn't happen.Only after idling for a while at the traffic and then hit the gas or after braking the motor by gear(downhill with gear braking-no gas) and then hitting it again.It's strange but there is nothing left for me,the head is ok so it is the rings or cylinder walls.All others checked.Pcv,egr e.t.c.Hope the oil will help a little.Any ideas about penzoil platinum 10w30?I've read somewhere it helps with f20c's that consume a lot of oil.Any other suggestion?
Thank all the guys for the answers.
Thank all the guys for the answers.
#38
I see you changed the valve guide seals, but did you check the valve guides for wear? With my previous car, seals alone didn't solve it - eventually I had the head rebuilt with new valve guides and the smoke ceased.
#40
peace of mind test - swap in an oem cat, if the smoke goes away you are all good. If the smoke continues you have a mechanical issue. If it goes away with an oem cat then go back to your test pipe and no need to worry about it any further, enjoy the drive.