Causes of a hot turbo/exhaust?
Discussion
Apologies if this is in the wrong section.
The exhaust manifold and turbo on my Subaru Impreza is getting too hot to touch, even after a few seconds of running. I'm struggling to find answers on subaru groups on facebook, scoobynet and even 22b.com.
On Tuesday the car was misfiring. I pulled over and the turbo had smoke physically coming from the body. I limped home and there is a noise coming through the air filter. I've stripped the turbo from the car and found minimal side to side play in the shaft. I put it back together today and filmed the noise, but literally with a 10 second run the turbo was smoking again and could not be touched.
Googling seems to tell me that the car is running lean. It was remapped 300 miles ago. One bit of advice I've had is that the cam belt may have jumped a tooth, but the cam belt was new 1000 miles ago, as was the cam belt tensioner.
I'm asking as I'm out of idea's as to which direction I should be going in.
The exhaust manifold and turbo on my Subaru Impreza is getting too hot to touch, even after a few seconds of running. I'm struggling to find answers on subaru groups on facebook, scoobynet and even 22b.com.
On Tuesday the car was misfiring. I pulled over and the turbo had smoke physically coming from the body. I limped home and there is a noise coming through the air filter. I've stripped the turbo from the car and found minimal side to side play in the shaft. I put it back together today and filmed the noise, but literally with a 10 second run the turbo was smoking again and could not be touched.
Googling seems to tell me that the car is running lean. It was remapped 300 miles ago. One bit of advice I've had is that the cam belt may have jumped a tooth, but the cam belt was new 1000 miles ago, as was the cam belt tensioner.
I'm asking as I'm out of idea's as to which direction I should be going in.
Sounds like the map is wrong and the engine is running lean, this will obviously affect the turbo temperature and destroy the oil feeding the turbo. Hope you leave the engine running to allow the oil to cool the turbo before switching off.
Other thought would be the engine is fine and the turbo is not being cooled properly, worth checking to make the sure the oil lines are clear and if the turbo is water cooled there isn't a blockage or other restriction.
Other thought would be the engine is fine and the turbo is not being cooled properly, worth checking to make the sure the oil lines are clear and if the turbo is water cooled there isn't a blockage or other restriction.
Turbo and manifold often glow red hot when being worked hard, so it's normal that they would be too hot to touch when running. They do have hot combustion gas going through them you know!
But if you are getting smoke, then I'd check for an oil leak spraying oil onto the manifold/exhaust/turbo.
But if you are getting smoke, then I'd check for an oil leak spraying oil onto the manifold/exhaust/turbo.
You do not say what age the car is, some of the classics would occasionally have the mad start to die which can cause misfires under load.
The manifold and turbo will get too hot to touch very quickly, they can easily become hot enough to glow when the car is used hard, if you have left any oil or grease on the turbo it will smoke until it is burnt off.
The manifold and turbo will get too hot to touch very quickly, they can easily become hot enough to glow when the car is used hard, if you have left any oil or grease on the turbo it will smoke until it is burnt off.
How do you know it is "too hot".
Do you have records of earlier temperatures of the turbo and manifold, or is this just pure guess-work?
You do know that turbo impellers and bodies are made of fairly special lumps of metal which don't melt when they glow cherry-red, don't you...?
The only reason it would smoke is if there is a something contaminating it too, bare metal does not smoke when hot.
Do you have records of earlier temperatures of the turbo and manifold, or is this just pure guess-work?
You do know that turbo impellers and bodies are made of fairly special lumps of metal which don't melt when they glow cherry-red, don't you...?
The only reason it would smoke is if there is a something contaminating it too, bare metal does not smoke when hot.
Lol, here's a link to video to how hot it was once I'd limped it home. https://www.youtube.com /watch?v=cf_fAQM-jVc
I've broken the link as I'm not sure on this forum's rules, and please excuse the music.
I've broken the link as I'm not sure on this forum's rules, and please excuse the music.
Thanks for the advice. I've checked the hoses leading to it, I've had the turbo off over the weekend and put it back on and checked again. The smoke doesn't smell at all. If something was leaking onto it then it would sizzle.
Here's a video of how horiffic it sounds. Now this is the first fire up after putting it back together and lasted 10 seconds or so, and the turbo could not be touched at that point or I'd have no finger prints. It is also the last time it will run without finding the cause.
https://www.youtube.com /watch?v=i8xCC1RS2yM
Here's a video of how horiffic it sounds. Now this is the first fire up after putting it back together and lasted 10 seconds or so, and the turbo could not be touched at that point or I'd have no finger prints. It is also the last time it will run without finding the cause.
https://www.youtube.com /watch?v=i8xCC1RS2yM
With the plugs out and (ideally) the TDC sensor disconnected (you really don't want spark or fuel) turn the engine over. Nasty rattling noises? Compression test.
I think you may have dropped a valve.
Having said that, you're asking for a lot to accurately diagnose a problem from a you tube clip.
But I think something has gone very pear shaped.
Did the re-mapper do it on a rolling road?
I think you may have dropped a valve.
Having said that, you're asking for a lot to accurately diagnose a problem from a you tube clip.
But I think something has gone very pear shaped.
Did the re-mapper do it on a rolling road?
TheRealFingers99 said:
With the plugs out and (ideally) the TDC sensor disconnected (you really don't want spark or fuel) turn the engine over. Nasty rattling noises? Compression test.
I think you may have dropped a valve.
Having said that, you're asking for a lot to accurately diagnose a problem from a you tube clip.
But I think something has gone very pear shaped.
Did the re-mapper do it on a rolling road?
Yes, it was mapped on the rolling road with det cans and then we went for a drive with the det cans also. I then drove the 40 miles home. I think you may have dropped a valve.
Having said that, you're asking for a lot to accurately diagnose a problem from a you tube clip.
But I think something has gone very pear shaped.
Did the re-mapper do it on a rolling road?
The mapper has suggested the cam belt has slipped causing it to run lean. As far as I am aware on an Impreza it can slip 2 notches without anything touching, it will still start and run, just not very well. I can't hear a knock.
The biggest problem I have with that is that it had a new belt, tensioner and all new pulleys 1000 miles ago.
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