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I have a 1986 f250 6.9 diesel an I am wondering if it is even possible to put tuneing screens or chips in this year of truck??
 

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the only way to tune a 6.9 is pump timing, resetting the metering screw in the injector pump or putting a bigger exhaust. those 6.9s were all mechanical with no computer comtrol on the engine, even the cruise control was mechanical. hope this helps.
 
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