Unleaded premium gas in an AE101

[DarkNinja75]

Would putting in unleaded plus or premium gas in a 4A-FE engine have much effect? I remember reading that if you're engine isn't designed to take high quality gas then it'd be pointless to use it. And I figure the 4AFE is designed for just regular unleaded.

[punter]

Yep on a 4afe it won't make a difference.
Only smallports, 20v's and gzes need high octane.

[gideon1331]

If the 4A-FE runs on premium like my 7A-FE does, your economy will go down and power will decrease. It also doesn't run as smoothly. 89octane never seemed to have much noticable effects, but nothing positive.

[jon_570]

when i used 87 octane my engine pinged..i enptied the tank and put 89 octane in it and it hasnt knocked since

[freakinbox]

basically any 4age after 1990 needs high octane.

the 4af that I have runs alot nicer on 92 than on 87. Less vibration. But I haven't run it for a few months now, and like I said I noticed a difference. Was really bad when I got it because the carb needed cleaning.