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E85 Problems

Xing Yi

By Xing Yi,
in Engines & Forced Induction

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Piggaz Grand Master

Piggaz

Posted
Posted

After the best bit of two years sitting around after popping the gearbox, the car finally made it back onto the rollers in Friday night. It didn't feel right so the tune was stopped. This is what came out of my filters.

7B8030C2-FCC0-4CE5-A699-104D2D45403B_zps

7E9CFC5A-1656-4C62-9FBB-9A9D5FBB65D1_zps

The car was parked with 98 in it too.

A fair amount of silty junk was found in the baskets of the injectors also.

mr skidz Veteran

mr skidz

Posted
Posted

After the best bit of two years sitting around after popping the gearbox, the car finally made it back onto the rollers in Friday night. It didn't feel right so the tune was stopped. This is what came out of my filters.

7B8030C2-FCC0-4CE5-A699-104D2D45403B_zps

7E9CFC5A-1656-4C62-9FBB-9A9D5FBB65D1_zps

The car was parked with 98 in it too.

A fair amount of silty junk was found in the baskets of the injectors also.

what's that gunk?
Piggaz Grand Master

Piggaz

Posted
Posted

You running rubber lines Paul? That looks pretty bad...

Some are.

After seeing this, I'll be going back through the fuel system with a fine tooth comb.

I've never had an issue like this before and the car has been using E85 since 2010.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

I have seen rubbery crap blocking the injector baskets a few times, I can only guess it's the inside of the rubber hose breaking down.

It's different to the molasses sticky mess that sometimes builds on the injector tip, after cleaning a few Audi RS4 plenums it looks like the same gunk they build up in the runners and around the valves, just a symptom of long valve overlap or high exhaust manifold pressure I suspect. Interestingly it's only one injector that gunks up in some cases, so I can't see the fuel being the direct cause.

Xing Yi Enthusiast

Xing Yi

Posted
  • Author
Posted

Got fresh engine, (i.e so no carbon anywhere) running on E85 for awhile since runin (10,000kms?)

Put a tank or two of 98 in, to satisfy demons in case of evil e85 doing e85y things.

Put E85 back in after sufficient demon-cleansing time

ton of shit in fuel filter and car running lean under boost, thanks, Haltech engine protection!

Knowing exactly 0 about 98/E85's cleansing properties, clearly the combination of the two either causes gunk, or flushes gunk in/out from somewhere, my filter was fine and my AFR's were fine until I put 98 through the car. Funny enough, was fine on 98 also, but obviously less fuel there as less is needed so a partial filter blockage may have had no effect.

Very interesting! Which Haltech has this function for lean out?

Kinkstaah Grand Master

Kinkstaah

Posted
Posted

Very interesting! Which Haltech has this function for lean out?

I have a PS2000 but many of them have the feature, basically you can input criteria or safe operating ranges and if you exceed them you can have the engine respond. I.e cut all fuel, set a rev limit of 3k, pull timing, or any combination of them.

In my case I have a wideband so it was a "Is my AFR leaner than 12.5 with boost higher than 1psi for longer than 1 second". Combined with auto logging if I'm above 70% throttle, it's pretty easy to determine through logs what happened and why. Can set it to trigger off oil pressure, fuel pressure, various temperatures, etc.

Considering I was driving it just fine on that filter on E85 on many many dyno pulls, Deca day, Drag passes etc and this mysteriously started happening after I ran E85 after a tank or two of 98, AND had a clogged filter (replaced filter working fine now) then I can only hazard a guess that the swapping of fuels caused something to dislodge :P

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

My 2 cents, I've been running E85 for about 2 years now and only recently gone over to a flex setup... I've also alway have used cheapy Ryco filters and bing then each time I do an oil change. The only thing I can think is that I've replaced all my old OEM Nissan fuel lines with Gates Barricade (except the hose from the LHS side of the tank that cross over into the lid then to the "jet pump".

Not long ago, I decided to pull out my injectors to have a look, they still seem quite happy.

Xing Yi Enthusiast

Xing Yi

Posted
  • Author
Posted

Are those filter elements from the fully hectic alloy 10um filters with cleanable /replaceable elements?

If you cut up a std Nissan steel jobbie one do you expect to see the same thing?

I believe they are stainless mesh cleanable type. But good luck cleaning my old one above.

My 2 cents, I've been running E85 for about 2 years now and only recently gone over to a flex setup... I've also alway have used cheapy Ryco filters and bing then each time I do an oil change. The only thing I can think is that I've replaced all my old OEM Nissan fuel lines with Gates Barricade (except the hose from the LHS side of the tank that cross over into the lid then to the "jet pump".

Not long ago, I decided to pull out my injectors to have a look, they still seem quite happy.

That's a good plan as they are cheap and easy to buy

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