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-   -   78 450SEL Rough Idle on Plug Carboned! (http://www.peachparts.com/shopforum/tech-help/13098-78-450sel-rough-idle-plug-carboned.html)

daniel 01-24-2001 05:30 PM

Trying to figure out why one plug is carboned while the other 7 are a light gray to white. I have replaced the plugs and the cap and rotor. I would appreciate any insight into this problem. I am sure that the cylinder is missing at idle and that is causing the rough idle!

Thanks

Benzmac 01-24-2001 08:43 PM

This is usually the most clear indicator of a worn valve guide or blown off guide seal. I would have it checked, but beware, it could need a very expensive valve job.


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