I've been using octane boost to prevent detonation on my mini-me. I'm only doing this because I wont have time to put the adjustable cam gear on till this weekend. Anyways, I probably put way to much of the stuff in the tank.

If I drive for more than 20 or 30 minutes I get a code 1 (o2 sensor) on the ecu. If I reset the ecu it goes away and does not come back for a few days or until I drive the car for a long period of time. Would the octane boost do this or do I need a new sensor?

 

afternoon bump.

 

bump for good question

 

dude,i run 125 octane airplane fuel in my 89 crx si which is stock and no cel

 

that answers that one. anyone else confirm?

 

high octane fuel shouldn't cause a CEL

..O2 sensor going bad...

i have trashed some O2 sensors using cleaners and additives. i can't vouch for any type of fuel additives based on my own experiences.

 

I recently did a head swap so I guess its possible I got some oil or coolant on the sensor. Guess I'll pick up a new one on pay day.

 

ran leadded race gas 114 octane and didnt throw a cell.

 

Okay. Here's the deal. Most of the octane boosters that you buy off the shelf of your local auto parts stores boost octane using compounds containing metals, such as ferrocene (which contains iron) or MMT (which contains manganese). The BIG problem compounds that contain metals is that they create ash when burned. This ash deposits itself on everything from sparkplugs, the inside of headers, oxygen sensors, to catalytic converters. And in the process of doing this, it tends to destroy such things as catalytic converters and oxygen sensors (despite supposedly being cat and oxygen sensor safe). This is particularly likely to happen if you use more than the recommended amount. In any case, I'd be willing to bet that if you pull out your oxygen sensor, it will have some wierd deposits on it. Unfortunately, the only solution is replacement. Just make sure that before you DO replace it, you burn out ALL fuel from your tank. And maybe run a full tank or two just for a good measure. Otherwise, you risk destroying another sensor. Oh, and your cat is probably toast, too.

In the future, just remember to avoid these octane boosters. If you need higher octane fuel, try to find a pump that has 100 octane in your area.

 

Great Info, but you know in CA we don't have anything above 91, It is hard to find places that are 100+

 

Ho ba, no need cat. lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VTEC-Power &raquo;</TD></TR><TR><TD CLASS="quote">Great Info, but you know in CA we don't have anything above 91, It is hard to find places that are 100+</TD></TR></TABLE>

Search the 76 website, i know there is one in Pasadena and one in West Covina. I checked last week, $6.05 a gallon for 100 octane

 

The 02 sensor code won't be thrown until about 50 miles have been put on it since reset.
So it isn't that you're not getting the code, it's that it takes a while to tell you.
Replace your O2 sensor.

 

Timing is fixed, so I will burn out the rest of the octane boost and go from there. Autozone has sensors for $19 (obd0) so I guess thats next on the list.

As for the cat being shot.... Luckily I just smogged it last month.