Engine Toast?
05-27-2009, 07:09 PM
#16
Lazer Beam Shooter
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Mine ran lean lean lean and burnt the valve.
The problem with mine was that the line coming off of the intake manifold to the ISV had popped out. Causing the mixture to screw up royally.
And which made it worse, the knock sensor wasnt connected either, causing the knock protection to fail.
The problem with mine was that the line coming off of the intake manifold to the ISV had popped out. Causing the mixture to screw up royally.
And which made it worse, the knock sensor wasnt connected either, causing the knock protection to fail.
05-27-2009, 09:34 PM
#17
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Mine ran lean lean lean and burnt the valve.
The problem with mine was that the line coming off of the intake manifold to the ISV had popped out. Causing the mixture to screw up royally.
And which made it worse, the knock sensor wasnt connected either, causing the knock protection to fail.
The problem with mine was that the line coming off of the intake manifold to the ISV had popped out. Causing the mixture to screw up royally.
And which made it worse, the knock sensor wasnt connected either, causing the knock protection to fail.
A big vacuum leak is kind of counter intuitive – it runs lean under vacuum and rich under boost. The vacuum lean is no or low load so there is not much danger.
05-27-2009, 11:31 PM
#18
Lazer Beam Shooter
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Actually if the ISV line popped off you will run rich under boost – and that will crank up the EGT and cause the burnt valve. Rich mixtures burn slower and create a situation where the mixture is still burning when the exhaust valve opens – bad news for the valve!
A big vacuum leak is kind of counter intuitive – it runs lean under vacuum and rich under boost. The vacuum lean is no or low load so there is not much danger.
A big vacuum leak is kind of counter intuitive – it runs lean under vacuum and rich under boost. The vacuum lean is no or low load so there is not much danger.
05-28-2009, 08:39 AM
#20
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Detonation tends to do a lot more physical damage - usually the spark plug electrodes are the first to go.
Once you take it apart you will find the exhaust valve has a pie shaped wedge cut out of it - it looks like it was done with a torch!
05-28-2009, 10:23 AM
#21
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No telling what that little pie shaped piece does on its way out of the engine? Or it could just stay put and chew up the cylinder.
05-28-2009, 10:32 AM
#22
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With stock chips you will hit overboost when running at 15psi (not a 15psi quick spike).
Another variable to examine.
06-02-2009, 12:44 AM
#23
Nordschleife Master
If you remove the KLR vacuum line and run it to a AM boost gauge, wont that allow you to run higher than "overboost point" boost levels?
06-02-2009, 08:41 AM
#24
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The KLR has nothing to do with detecting overboost. The DME detects overboost (actually overload) then tells the KLR to do its thing.
In reality, (except with the V-FLEX software) the DME never did read actual boost as in psi/bar. It calculated load, and based on load it determined the status.
