FJ60 fuel octane - what do you use?

[MJ_Oregon]

I had went through two tanks of premium *92 octane and my truck was running like a champ. I ran the tank down low and filled up with regular *87 octane. Now my truck is sputtering and hesitating.

I am going back to premium (at $65 a tank).

Do those octane boosters really work?

What do you run in your FJ60?

Mike
84 FJ60 200k mi

 

[High Desert]

I run only regular, I do run "name brand" but that's the only special treatment considered. Keep it tuned and go. I get gas milage comparable to most of the mudders that have posted about mpg. No knock or other ill effedts. It performs like a underpowered 2 ton SUV.

That's all I expect from it.

 

[nikos8]

If you search the forum you will get a lot of info on this subject. You don't need premium gas. You don't have a hi-tech hi-reving engine. You have a lawnmower engine. Using premium is a waste of money. The sputtering and hesitating you mentioned could have been from gas that had dirt or water in it.

 

[2badfjs]

85 in the tractor

with a can of 44k twice a year

 

[REKCUT]

Mine diesels if I dont use premium. I run a webber and dont know if that matters but there is a noticeble diff if i go to low octane.

 

[d'oh]

I too run a Weber and can tell the difference if I don't use premium. Ends up being about a two or three dollar difference on a $45 tank of gas, not that big a deal.

 

[Pluton]

My old 60(an 85)had the EGR disconnected and needed premium and it still had light pinging on long highway grades,etc. My current 60 with all smog hooked up and working, both w/ the old and new OEM carbs, needs only 87 octane(the lowest here in CA) and only pings if i truly lug it.

 

[krzyabncanuck]

The owners book says 87 so that is what i have always run in mine. Never had a problem out of any of my old cruisers at 87 .

 

[NocalFJ60]

When I read the title of this thread this comment by Mark W. came to mind.

https://forum.ih8mud.com/showpost.php?p=404641&postcount=4

https://forum.ih8mud.com/showthread.php?t=37348

https://forum.ih8mud.com/showthread.php?t=44220

 

[Mark W]

If you are not running a high compression hotrod 2F, then you can run whatever crap gas you can find for the cheapest price. If your engine is stock and really does want premium (as opposed to you wanting it to need premium)... then something is seriuosly wrong and it needs to be fixed.

Your 2F was designed to run on 3rd world gasoline. American grade regular is caviar to that pig.


Mark...

 

[FJ60_cruiser]

Your 2F was designed to run on 3rd world gasoline. American grade regular is caviar to that pig.


Mark...

That's right, at the moment here in Venezuela the gasoline is coming really s***ty this year... and many cars are starting to have problem because of it but trucks like cruisers are made for that.

well i use to run 91 octanes, but right now i'm rebuilding my 2f and i think tomorrow is ready, also think i'm gonna change to 95 octanes gasoline.

what would you recomend me to use? well the 95 octanes gasoline is a lot better than the 91 octanes, i'm talking about cuality. also here in Venezuela we only use the two tipes of gasoline i mention before and the 95 octanes is the premiun one.

 

[REKCUT]

DIESELING, also called after-running or run-on, is a problem when the engine keeps running after the key is turned off. A knocking, coughing, or fluttering noise may be heard, as the fuel ignites and the crankshaft spins. When dieseling, the engine ignites the fuel from heat and pressure, somewhat like a diesel engine. With the key off, the engine runs without voltage to the spark plugs. The most common causes of dieseling are high idle speed, carbon deposits in the combustion chambers, low octane fuel, overheated engine, or spark plugs with too high of a heat range.

There are numerious articles about dieseling and everyone I find gives low octane as one reason for the problem. Since I have had the engine rebuilt and the deiseling goes away with a higher grade of fuel I will continue to assume that the octane is the reason verses the option that I just want someone to notice me putting in higher grade fuel.

 

[DBS311]

One thing everyone needs to stop doing is associating lower octane with "crappier" gas. The octane rating losely relates to the speed at which fuel burns. High compression and forced induction engines need high octane fuels because their combustion temps are so high and they need a slower burning fuel so they don't detonate. Our compression levels are so low that there is absolutely no reason to run anything higher than 87. If your vehicle runs poorly with 87 (stop calling it cheap gas even though it is less expensive) then you probably need a tune up.

The lower octane can lead to dieseling because, as stated above, the fuel ignites from the heat of compression. Higher octane, since it burns slower, can remedy this problem. My advice would be to get the vehicle tuned properly.

 

[cbmontgo]

183K miles and 87 octane works like a charm.

 

[bigbertha]

octane

200K and 195K and 87 octane is what we feed. At $2.99 a gallon, it better be high enough octane... sheeeeit.

 

[RIQUE]

I've tried using both 87 and 95. Due to the high altitude where I live if you don't have fuel injection on your car premium will not burn as well as 87. Consequently my truck uses 87 and runs much better than with 95. Rique

​

eusing

 

[zcruiser]

DIESELING, also called after-running or run-on, is a problem when the engine keeps running after the key is turned off.

I remember my dad and I standing outside the house when my older brother drove up in his beater car (don't even remember what it was). He got out, walked up to the house while his car sputtered and shook and belched black smoke out the tailpipe.

Dad: "Aren't you going to shut it off?"

My bro: "I did."

That, my friends, is dieseling!!!

 

[burnsmancuisen]

I recently made a switch to the 88 octane opposed to the 86 I have been running, because of a slight pinging under acceleration. The difference was noticable. But the tempurature around here is ranging [today] according to the motel signs 96 degrees to 105 degrees, in the late 6:30 pm afternoon. I have a desmogged mostly stock 2F with 300,058 K and counting on it. I am guessing the fact I live in the desert might attribute to the pinging on the low grade fuel.

 

[gulp3000]

85. If they sold a lower #, I'd be running it.

 

[land crusher]

Get yourself a flux capacitor and it will run on banana peels.