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Smoking issue


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Hi guys

I have an issue with the car smoking, colour wise it's greyish, engine is around 6k old after going forged, the smoking occurs when the engine is hot, never does it on idle or on boost(that I can see), it's when I coast then touch the throttle, in stop start traffic you can't see out there rear window.

I have had the car back at the garage the engine was built and they have done compression and leak down, bore scope, removed turbo chra and inspected and found nothing and suggested moisture in the exhaust but after the weather we have had this is now highly unlikely.

Would valve stems cause this to happen, as before now smoke on idle and no smoke on startup either. It's slowly getting worse.

Cheers

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I dont know about the oil usage on forged lumps as i havent looked into forging yet but i cant see it being good you topping coolant up once a month, and regards to smoking whilst idle, stop/start etc then yeah possibly stem seals if the garage has ruled out everything else.

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Sounds like it could be stem seals or worn valve guides. Under high vaccum it can pull a bit if oil through. I had it once on a very steep hill i coasted down, then a puff of smoke. Has never happened again. Valve guides seem to be a thing thats ignored when forging

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When I top coolant up it's possibly around 100-200ml, when forged the head was rebuilt with new valves guides and valves. I had heard that toyota stem seals can be a little dodgy even when new so I gave him updated zisco ones to fit, I'll give him a ring and get some advise, makes sense when coasting you pulling high vacuum that oil will be sucked into the chamber, I do know it's a high compression build.

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Sounds like it could be stem seals or worn valve guides. Under high vaccum it can pull a bit if oil through. I had it once on a very steep hill i coasted down, then a puff of smoke. Has never happened again. Valve guides seem to be a thing thats ignored when forging

he said it filled out the rear view mirror so i doubt it will be valvestem seals ollie as that smoke is never going to fill out the rear with smoke ? ( not that i ever seen anyways )

u should not be topping water up every month thats your isseu right there i think gasket is seaping a tiny bit causing the smoke ?

get a sniffer test don on the3 coolant drive it till it does it again then test it

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On the worst case it will fill the rear view mirror when stop start traffic, but 90% of the time it isn't as bad as that. Coolant system has been pressure tested on cold and hot with no issues. It is a very weird one that's why am asking you guys, am usually pretty good with cars but this is very strange. I'll mention the sniffer test to prove/disprove it's coolant.

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he said it filled out the rear view mirror so i doubt it will be valvestem seals ollie as that smoke is never going to fill out the rear with smoke ? ( not that i ever seen anyways )

u should not be topping water up every month thats your isseu right there i think gasket is seaping a tiny bit causing the smoke ?

get a sniffer test don on the3 coolant drive it till it does it again then test it

Doesn't take alot of oil to make alot of smoke. Its the internet too, people exaggerate, twist and withhold info lol. With that logic, why would coolant burning fill the mirror coasting and not booting it? Surely more would be burnt on boost

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  • 1 month later...

Just wanting to bump this up, I'm having the same smoking issue, not forged and I'm pretty sure unopened 4efte on 180k kms, had it before and it turned out my turbo was gone, got it rebuilt and made into a hybrid but I'm still getting the smoke after boosting up coasting and touching the throttle.

Never smokes on boost or on idle, can it be fuel related?

Never have to top up oil or coolant but then again it only gets driven at weekends

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  • 1 month later...
  • 5 months later...

Interesting...mine seems to be a bit of the reverse. When idling, it smokes too much...not visible as if a turbo seal is gone but still too much smoke. Smoke isnt blue but isnt really white either....i know it is not the best description but i will try to get a vid of it. The strange part is the smell of the smoke, smells like something is burning. And it does not smoke all the time, seems to be on and off occurence...i know it tends to come after some hard runs tho..but other times it can simply be after switching on the car.


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