I just thought I'd check to see if anyone else is having this problem..

It seems like everytime I try to put 93 octane in the car my CEL will come on within 30 miles of when I leave the gas station.

To avoid this I've been using 87 octane pretty much for 6 months now.. No CEL ever.

This isn't really a problem at all since the car runs exactly the same with 87 as 93, and being cheaper is a plus. But I just found it odd..

Anyone else have this happen to them?

 

nope,been running 93 since day 1
i try to use 94, but nto all Sunocos have it

 

been using 93 also.. never once had a problem..

 

you might wanna get that checked... ive used 87, 89, and 93 and no problems since. but my favorite shell v-power lol.

 

Same Here

 

I think you guys are crazy for even paying for 93 when you don't need to. 87 is expensive enough.

 

I use Shell v-power and never had a CEL problem.

 

Hmm, maybe it's not the octane, maybe it's something else..

I haven't even tryed to put 93 octane in for a few months now and haven't had any CEL's.. I'm going to put 93 in tomorrow and see if it does it again.

 

In all honesty... there's no reason to put anything higher than 87 unless you're running high compression or boost.


But I'm guessing you've read this already.

 

Yeah..Im not understanding why its being run at all...especially if its causing you to get CELs. In the long run you may be causing more harm than good since the engine doesnt have enough compression to completely combust the fuel. This can lead to accelerated depositing of carbon in the combustion chamber, cats being fouled sooner and a decrease in gas mileage. Youre basically just throwing money away.

 

True, I guess I'll just stick with the 87 which doesn't cause the CEL. The car runs great with the 87, idle is perfect even with the A/C on.

 

the maunal says to use ojnly 87...

maybe 93 octane is not good for your cat or car because to much of a good thing is bad you know

 

Yea makes me curious to what CEL code the ecu is throwing...

Have you scanned it?

 

what he said

 

Im aslo curious to exactly what code its throwing

 

why the hell would you waste money buying premium??? theres absolutely no reason to unless you have forced induction (turbo/sc). it does absolutely nothing for our cars otherwise.

 

No reason at all to use 93 octane on a car that is made to run on. You will see no benefits from running a higher octane. Its possible that the CEL is coming on because the fuel maps are run for 87 octane, and it may be reading a misfire in all 4 cylinders. Don't hold me to that, since im not 100% sure.

 

I never checked the code it was throwing.. It happened 3 times to me in about 1 year.. after that I just stopped using 93 and it never happened again.

 

why were you using 93 octane in the first place?

 

93 octane does nothing except burn slower. Unless you have a way to adjust your timing, you are wasting money and horsepower.