PO300 01 TOYOTA 4.7 LITRE V8 MISFIRE DIAGNOSIS

[@electromechanicalstuff2602]

Mine flashes only at idle. Goes away over 1000rpm. 300 302 304 306 308. Just the one side. New denso plugs old ones didnt look awful and nothing in color stood out as different. started pulling coil wires on that side 8 did the least amount of reaponce. Swapped 8 coil with 7 coil. Still missing on just psg side2468. Pulled injector on 8 again least amount of response. Maybe injector? No other codes. Odd tho was it gave me the coil codes when i unplugged them but nothing when i did the injectors. Also no lean codes. 160k miles

[@electromechanicalstuff2602]

@@mikemike4737 bad valve. Check compression

[@sergio23988]

I have misfire on 1,3,5,7 plus evap emissions leak and

[@automotivetech-vet]

Toyota is real bad about when one coil goes bad the computer will set multiple codes I would just replace one coil and one plug on bank one at a time until the misfire goes away I seriously doubt all 4 coils are bad 1357 are all on the drivers side

[@automotivetech-vet]

The evap code is probably a vent valve on the canister assembly start with a factory gas cap first then see if the code comes back my friend

[@thatoneguy6313]

I just swapped all plugs and coil with denso now a misfire is present on 2,4,6,8 any advice

[@Palomino3]

I'm experiencing the same issues even after replacing all the spark plugs and coils. It's quite frustrating.

[@thatoneguy6313]

@Palomino3 before I cleared my codes, I had an 02 sensor code pop-up hasn't returned? So that was my next obstacle