Matthewstorm

Driving today I suddenly heard major popping from exhaust. A few minutes later CEL came on. Got home and checked the codes. P0302, Cylinder 2 Misfire. Waited an hour and started it again. Engine ran perfectly fine, no CEL. My performance shop said it was bad fuel. I've had issues with this station and E85 a few months ago. Had it at the shop on the Dyno and they noticed reduced HP. Checked the fuel and found out it was badly diluted, real garbage. Problem is I have few options for E85 in my area. My question is, is there an Octane booster I can use for ethanol until I can run out this tank? Thanks.

PatternDayTrader

If it were really a fuel problem then it would effect all cylinders. I would think you should have a PO300 set.

99mallett

Why are you running E85? Stay as far from that crap as you can. Don't even think of running it in a Corvette.

KCV

My thoughts exactly.

Matthewstorm

Why do you think running E85 is bad for the car?

Matthewstorm

Sorry, what's P0300?
Still hoping someone will answer my original question.

Mobil 1

P0300 random missfire
Bad fuel should affect all cylinders not just one cylinder is the point.

PatternDayTrader

So to address your question directly, I don't think octane booster is available for e85 since the typical octane rating of e85 is between 100 and 105.
So there's that.

probono

Siphon the gas in the tank, refuel, and call it good...

Ken

Matthewstorm

My code was P0302, which is Cylinder 2. The reason my shop suspects fuel is because after I started again it was fine. A mechanical malfunction would always be there, plus I had a fuel issue a few months back with the same station.

PatternDayTrader

A mechanical malfunction will always be there, but the symptoms may not. A good example would be a spark plug with a carbon track developing. Sometimes it will function as intended, and sometimes not, until eventually it fails completely.

Phanni

I wouldn't use E-85 in my worst enemy's car.

Matthewstorm

What's your issue with E85?

Walt White Coupe

The car is not designed to run on it!!!!

Phanni

On top of that^, you lose about 30% on mileage.
BTW, E-85 has more octane than 10% ethanol.
It takes more volume of fuel to run properly though,

vader86

I'm assuming you did an E85 conversion, if not then you don't need to put that **** in the car.

If its Cyl 2 misfire, I'd suspect Cyl 2 has a problem right? So maybe the coil on 2 is dying. If its bad gas, it would be all cylinders misfiring.

Kent1999

GM specifically states do not use gas with more than 10% ethanol in the C7.

OP uses 85% ethanol gas in his/her C7 (E85) and then whines that it doesn't run right/causes problems.

Who in the world could have guessed this outcome?????

KCV

^ ^ ^ That.

Matthewstorm

Well, the car has been converted so it should run fine and has for 3 months.
Went for 2 drives today, 30 minutes and 10 minutes. No CEL, no codes, no problem at all. Very strange.

I get 13 in city and 21.5 on Hwy.

LDB

Octane has nothing to do with misfire. Low octane gas will fire just fine, in fact, a bit too well, as it burns too fast and/or detonates instead of burning. Octane is simply an antiknock index to indicate how well a fuel resists knocking. Misfire is totally different from knocking and must have either mechanical causes or bad fuel or a combination of both, such as bad fuel fouling spark plugs and/or injector tips. So there’s no reason to think an octane booster would help your problem. It’s more likely to create a second problem. The two types of octane boosters are MMT and aniline. MMT is an organic manganese compound that while less toxic than the old tetraethyl lead, is still toxic and still fouls both the engine and the cats. Aniline is highly corrosive and voids most warranties.