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Burnt exhaust value on cylinder #3

 
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Old 30 Jul 2014, 10:45 pm
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Unhappy Burnt exhaust value on cylinder #3

I have an 06 PT with 36900 miles on it. Has anyone had this problem with their PT?
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Old 31 Jul 2014, 07:53 am
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Default Re: Burnt exhaust value on cylinder #3

Is that under 37,000 miles????
Must've been a defective valve - NOT common, certainly not at your miles.
Have that injector checked, you might have a severely lean condition in that cylinder.
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Old 31 Jul 2014, 09:36 am
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Default Re: Burnt exhaust value on cylinder #3

For a PT Cruiser 2.4 it is not common. How did you determine you had a burned valve.
Normally if you had any issue that would cause a mechanical condition like a burned valve there are several warnings that the PCM would have indicated a DTC(s) well in advance of this happening. An example if you had an issue with an injector you would have a DTC code relevant to several operating conditions effecting the injector long before you got a burned valve. Naturally the exception to that example would be if you were racing the engine at extended high RPMs. Another indicator would be your coolant temperature fluctuating from the normal semi stationary "center" or "middle" position
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Old 31 Jul 2014, 05:26 pm
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Default Re: Burnt exhaust value on cylinder #3

This has been repeated here infrequently and I've seen it several times.
I've posted photos.


With the 2001 2.4 engine, they switched to a smaller exhaust valve and three groove keepers. The pre- 2001 Stratus/C-Van 2.4 (or Neon 2.0 DOHC) didn't have these issues. My guess would be they thought they could get away with a less expensive or 'lighter' valve if it were smaller.
Only wild speculation. It could also be three groove keepers allowed valves to rotate (their purpose) too much.

Engines, in general, are very durable, I doubt there's any way you get an exhaust valve to burn even if you tried.
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Old 02 Aug 2014, 02:57 am
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Default Re: Burnt exhaust value on cylinder #3

my 06 had 2 burnt exhaust valves when I bought it, the previous owner told me it ran rough because it needed a cam sensor. a bunch of money later it's running good, 25 mpg hand calc.
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Old 02 Aug 2014, 10:03 am
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Default Re: Burnt exhaust value on cylinder #3

^^^^ interesting.

In the scheme of things, swapping out exhaust valves isn't that much furthber than doing the timing belt.
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Old 02 Aug 2014, 08:41 pm
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Default Re: Burnt exhaust value on cylinder #3

Yea I had a valve job done and timing belt. This was before I joined this site so I didn't know about the water pump and tensioner so I guess I'm running on borrowed time.
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