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carbon on two cylinders other two clean

 
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sireland2112  



Joined: 17 Dec 2014
Posts: 1
Location: Jackson,MS
PostPosted: Fri Jun 10, 2016 11:39 pm    Post subject: carbon on two cylinders other two clean Reply with quote
I have a 1977 924 I have been getting gas in oil so I tore down engine and put in new rings. Cleaned cylinder heads .two weeks later oil pan gasket blew.(full of gas ? pulled head cylinder 1 and 2 full of carbon/ 3 and 4 clean I have never ran across this any thoughts ? Thanks

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ideola  



Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
PostPosted: Sat Jun 11, 2016 6:18 am    Post subject: Reply with quote
Sounds like excess fueling on cylinders 1 and 2 caused by either leaking injectors or failed o-rings in the fuel distributor. Next step is to pull all four of the injectors, put them in glass jars, and run the fuel flow diagnostic in Haynes to see what is causing #1 and #2 to overfuel.
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