Leaking o2 housing and burnt manifold
May 18, 2009, 06:09 AM
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Leaking o2 housing and burnt manifold
I smelt fumes in the car today. It seems my o2 housing gasket is leaking and one of the runners on my porterd stock exhaust manifold has a burn spot.
Obviously I'm going to replace the gasket, but is the manifold a sign that I have bigger problems like a lean cylender? Maybe a dying injector? Or maybe simply the result of the leaking gasket?? I've also been getting an ses light every now and again. Maybe the gasket burnt bc of the problem and will just happen again??.... Any input?
Thanks
Obviously I'm going to replace the gasket, but is the manifold a sign that I have bigger problems like a lean cylender? Maybe a dying injector? Or maybe simply the result of the leaking gasket?? I've also been getting an ses light every now and again. Maybe the gasket burnt bc of the problem and will just happen again??.... Any input?
Thanks
May 18, 2009, 11:01 AM
#4
All I can think of that can cause temps high enough to melt cast manifold is AFR too lean (14's), timing retard (knock), while under high boost. Unless it was ported severly
May 18, 2009, 11:46 AM
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Can this be explained more discriptively? I can't understand how leaking at the turbine outlet can deposit C and how this deposit can lead to higher temps pre-turbine.
All I can think of that can cause temps high enough to melt cast manifold is AFR too lean (14's), timing retard (knock), while under high boost. Unless it was ported severly
All I can think of that can cause temps high enough to melt cast manifold is AFR too lean (14's), timing retard (knock), while under high boost. Unless it was ported severly
How can I tell if it's running too lean? Find someone with a Trax cable?
On a side note, After a recent tune, i gained 2mph in the 8th mile and only one in the 1/4 mile. maybe this is a result of the car knocking under heavier loads?
One more thing, where's the best place to buy a new o2 housing gasket???????
May 18, 2009, 02:23 PM
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Thanks for the info.
Anyone have a part number for that gasket?
Also, anyone have an opinion on if the gasket may have went b/c the car is running lean?
Or if the car is going lean because of the faulty gasket?..... Or if both are a result of a messed up injector?
How common are injector problems @30,000miles and 370whp? hmmmmm Any info or guesses would be appreciated! Thanks again
Last edited by Carloverx; May 18, 2009 at 02:26 PM.
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May 18, 2009, 02:23 PM
#8
Sorry to take it OT a bit, but I have a question for ya... Did/does your car "whistle" upon start up? I have had this whistle for a while now, and Im thinking its an 02 leak... But every1 that has looked at it, says no... (It never whistled while they were there, due to the car being warmed up though)
May 18, 2009, 02:36 PM
#10
Can this be explained more discriptively? I can't understand how leaking at the turbine outlet can deposit C and how this deposit can lead to higher temps pre-turbine.
All I can think of that can cause temps high enough to melt cast manifold is AFR too lean (14's), timing retard (knock), while under high boost. Unless it was ported severly
All I can think of that can cause temps high enough to melt cast manifold is AFR too lean (14's), timing retard (knock), while under high boost. Unless it was ported severly
Keep it simple man. You added stuff that he didn't even post in the original thread, or are you just assuming? If the exhaust side of his engine actually got hot enough to melt a cast manifold, I am pretty certain that other things would have started to melt way before that, but you do have a valid point in one area regarding overporting, and I am gonna assume it may be the burn spot he's talking about.
May 18, 2009, 04:52 PM
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Sorry to take it OT a bit, but I have a question for ya... Did/does your car "whistle" upon start up? I have had this whistle for a while now, and Im thinking its an 02 leak... But every1 that has looked at it, says no... (It never whistled while they were there, due to the car being warmed up though)
May 22, 2009, 09:16 AM
#12
Thanks for the info.
Anyone have a part number for that gasket? mitsu part's dept
Also, anyone have an opinion on if the gasket may have went b/c the car is running lean? The bigger problem is the exhaust runner being toasted
Or if the car is going lean because of the faulty gasket? Under load it will leak, it won't make the AFR change. Closed loop might run rich
Or if both are a result of a messed up injector? At this point the exhaust runner being burned is a sign of too much heat, probably from the TUNE, and/or too much backpressure on the turbine. The O2 housing problem is probably just a leak, if heat damage occured downstream turbine, everything upstream would be toast.
How common are injector problems @30,000miles and 370whp? hmmmmm Any info or guesses would be appreciated! Thanks again
Anyone have a part number for that gasket? mitsu part's dept
Also, anyone have an opinion on if the gasket may have went b/c the car is running lean? The bigger problem is the exhaust runner being toasted
Or if the car is going lean because of the faulty gasket? Under load it will leak, it won't make the AFR change. Closed loop might run rich
Or if both are a result of a messed up injector? At this point the exhaust runner being burned is a sign of too much heat, probably from the TUNE, and/or too much backpressure on the turbine. The O2 housing problem is probably just a leak, if heat damage occured downstream turbine, everything upstream would be toast.
How common are injector problems @30,000miles and 370whp? hmmmmm Any info or guesses would be appreciated! Thanks again
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