Update on Scored Cylinders

[CrazyHippie]

Hello; I looked up Iso Heet. It is isopropyl alcohol which has been used for decades to remove water in fuel. I used to use the stuff every winter along with keeping the tank topped up.
Most modern fuels have ethanol alcohol blended in. Most common is E-10 which is a 10% blend of ethanol + gasoline. There is a push to up it to E-15. You can get E-85 as well.

The iso-heet additive was a problem saver back when tanks were metal and fuel systems were open to the air more. Tanks condensed water in the tank. The water is denser than gasoline so over time the gasoline and water separated to wind up with a layer of water with the gas floating on top. You could wind up with an inch or more of water in the bottom of the tank. In cold weather the water could get into fuel lines and freeze.

The isopropyl alcohol mixes well with water so would be added to help with the freezing in fuel lines. Here is where I may show some ignorance. I am fairly confident that ethanol alcohol also absorbs/mixes with water. I stopped using Iso-heet back when E-10 and tighter fuel systems came along and have not had problems. My thinking being the ethanol would do the job of the Iso-heet. My thinking may be off.

Anyway I think it is known an E-10 pump mix has a problem, maybe two. If alcohol blended fuel sits a while the alcohol and gasoline will start to separate. I have read at six months such can start. That is one problem.

I am less confident of the next idea. If the ethanol also absorbs/mixes with water the thought is two things might happen. One is the alcohol will mix with enough water to affect the way the fuel burns to some degree in the engine.

Second is the alcohol likely has a maximum capacity to absorb water. Once the maximum amount is mixed then extra water will become a layer on the bottom of the gas tank. That would explain the three distinct layers in the picture of your fuel.

Hi! Yes, ethanol and isopropanol both bind to water in specific ratios that cannot be separated by distillation. They call these alcohol-water mixtures azeotropes. The ethanol azeotrope is approximately 5% water by volume and the isopropanol is about 9% water. Additionally, there's a limit to the amount of water that can be pulled into gasoline by the alcohol without separating. Isopropanol can pull much more water into solution, so isopropanol is a better gasoline drying agent than ethanol.

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[sk47]

Recall alert: 48K Fords recalled over valve failure
Hello; Gist of the link is an EGR valve recall. Seems at this time there is not a fix, maybe later. I post in this thread to pose a question. What are the chances a faulty EGR can contribute to random misfires? A little? A lot? Not at all?

 

[OldbutNew]

Recall alert: 48K Fords recalled over valve failure
Hello; Gist of the link is an EGR valve recall. Seems at this time there is not a fix, maybe later. I post in this thread to pose a question. What are the chances a faulty EGR can contribute to random misfires? A little? A lot? Not at all?

Coyote engines do not have an EGR system.
For those engines that DO, the answer is yes. An EGR system that is over or under adding exhaust gas to the intake will cause misfires.

 

[mt82#1fan]

Is the intake system stock? Have you tightened all of the connectors / clamps between the filter and the throttle body? I had a P0300 on the track that turned out to be the engine flexing on the motor mounts under heavy braking that was kinking the intake hose and letting in un-metered air and causing the CEL. Once I tightened everything it never returned.

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