Burnt exhaust valves

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Burnt exhaust valves - 7/28/2006 6:16:57 AM    sunrise   Posts: 2 Joined: 7/28/2006 Status: offline Ive had a chariot for 2 years and have just burned out the 4th set of exhaust valves. This only happens on no 4 cylinder. Mechanics just keep replacing the valves. After the 2nd set they replaced the engine and head. After 4 months valves on 4 burned again replaced and have now gone again. The problem mut be something feeding no4 cylinder. Any ideas? Post #: 1

RE: Burnt exhaust valves - 7/28/2006 6:56:12 AM    Sebba Posts: 14035 Joined: 2/20/2006 From: San Antonio, TX Status: online I have a feeling its to do with the design of the intake manifold. There was something they noticed when designing them for the 4G63 that if you just have it like a rectangle it wont get adiquate air flow to the last cyl. Maybe the same applys to that one? _____________________________ (in reply to sunrise) Post #: 2

RE: Burnt exhaust valves - 7/28/2006 11:49:03 AM    VR4GARY Posts: 148 Joined: 7/7/2006 Status: offline Has this car ever sat for long periods of time? Has the engine ever been apart and sat dismantled? The reason I ask is that it sounds like you are running way too lean in cylinder #4. This can be caused by an obstruction in the intake manifold, even spider webs. The other thing to look at is the injector for that cylinder. A bad injector will cause it too burn too lean. Burning lean causes any metals to burn. _____________________________ Gary Callahan (in reply to Sebba) Post #: 3

RE: Burnt exhaust valves - 7/29/2006 5:19:43 PM    estraw Posts: 2188 Joined: 12/10/2005 Status: offline i'd go with the injector theory. if there was somthing obstructing the intake, it shouldn't me getting enough air. thats not lean, so it wouldnt be burning as hot _____________________________ (in reply to VR4GARY) Post #: 4

RE: Burnt exhaust valves - 7/29/2006 9:45:24 PM    patsevo8   Posts: 119 Joined: 4/28/2005 Status: offline have you tried to flush the injectors. (in reply to sunrise) Post #: 5

RE: Burnt exhaust valves - 7/30/2006 8:40:12 AM    Sebba Posts: 14035 Joined: 2/20/2006 From: San Antonio, TX Status: online Im sticking with my thought. It was a problem with some aftermarket intake manifolds for DSMs _____________________________ (in reply to patsevo8) Post #: 6

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