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Re: 92 LSL misfiring, terrible fuel economy, CEL codes... Help?
If you have a bad injector, it would be pretty easy to get injectors used, I have 12 in my garage that aren't busy.
First, clear codes (unhook battery for a few mins) and see what comes back. The O2 sensor, don't go replacing it just yet, it's probably reading off because of the misfire.
You could also have a bad spark plug or coil (coil is unlikely, but maybe the 89 octane caused one of the spark plugs to get messed up?). First narrow it down to which cylinder, or at least which bank.
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'94 Laguna Blue LSi ~159k .......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project
'97 Ebony LSi ~137k #036 .......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod
Now a mod "over there"  ............Photo album
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