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Originally Posted by HanibalTheCannibal
Well, I had the delaership check my truck out. There is a slight diesling/clattering when driving 35-65mph up a hill. they state it is a normal function of the timing advance system or something like that.. I recently went to 87 octane. Is this the cause? It started after going to 87. It never did it with 92 or 93 octane. I quit using it because if the price. But I am going to go back to better gas. My old ford truck does the same thing but using 89 or 93 resolves it. I thought these newer trucks had ways of dealing with low octane gas 
any thoughts? SHould I go back to dealership? There are only 100 miles left on my warranty |
Higher octane fuels burn slower and will cause carbon deposits to form on valves and other combustion chamber componants if used in vehicles designed to run lower octane fuel.
The carbon deposits absorb fuel from the intake air fuel mixture and will cause the engine to run lean and is one cause of detenation.
I would have the engine intake system decarbonized and only run 87 octane fuel. (your engine is designed and calibrated for 87)
Also only use Top Tier gasoline, this is gas that is formulated to meet the standards for fuel quality set by the auto makers.
Find my thread about "truth about Gasoline"
Right here