Shell gas and knock retard
12-03-2018, 10:21 PM
#1
Shell gas and knock retard Anyone else getting increased kr with shell gas? I have an 07 Yukon Denali and I'm seeing up to 11 degrees of knock retard at times but only for a second. This is in fifty degree weather with an vararam tripower intake. Haven't tuned for Intake yet .Is there any other fuel that won't cause so much knock retard? Im using 93 octane also Pennzoil natural gas oil. I need to figure this out before bad happens.
12-04-2018, 07:52 AM
#2
Octane is octane... regardless of brand. If Shell 93 octane is causing knock then it will be the same with any other brand unless you suspect the particular station you use may have bad gas. You could try buying gas from another Shell station to see if the problem persists.
A little knocking under load is not generally detrimental to the engine but persistent knock definitely can be. You could have bad sensors or deposits in the cylinders. You could try adding an octane booster to your gas or finding a Sunoco station that has 94 octane to see if higher octane reduces the knock.
A little knocking under load is not generally detrimental to the engine but persistent knock definitely can be. You could have bad sensors or deposits in the cylinders. You could try adding an octane booster to your gas or finding a Sunoco station that has 94 octane to see if higher octane reduces the knock.
12-04-2018, 08:23 PM
#3
Octane is octane... regardless of brand. If Shell 93 octane is causing knock then it will be the same with any other brand unless you suspect the particular station you use may have bad gas. You could try buying gas from another Shell station to see if the problem persists.
A little knocking under load is not generally detrimental to the engine but persistent knock definitely can be. You could have bad sensors or deposits in the cylinders. You could try adding an octane booster to your gas or finding a Sunoco station that has 94 octane to see if higher octane reduces the knock.
A little knocking under load is not generally detrimental to the engine but persistent knock definitely can be. You could have bad sensors or deposits in the cylinders. You could try adding an octane booster to your gas or finding a Sunoco station that has 94 octane to see if higher octane reduces the knock.
12-05-2018, 07:33 AM
#5
12-08-2018, 09:41 AM
#6
TECH Junkie
BG 44K Fuel System Cleaner
This product is unreal but expensive at over $20 the last time I bought it. My local Chevy dealer threw it in my Trans Am once, and when I had an old air-cooled 911, my Porsche mechanic even recommended it. It's good stuff but don't get any on your paint!!
12-08-2018, 12:37 PM
#7
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I'd recommend Red Line SI-1. Excellent product for fuel system cleaning, full dose for initial clean up (full bottle), and can be used continually at a maintenance dose level (1/5 ounce per gallon of gas) thereafter.