Backfiring and hesitation under load

[Drain2]

Hello all! Had to create a new account and decided a new thread would work as well

I have replaced spark plugs, coils, distributors, caps, rotors. And all 3 sensors and plugs with them on the cams and crank. I had a code 31 but that was resolved with new plug for MAF

Sc400 has code 13 hesitates under load and will not rev over 2000 in neutral or it backfires through exhaust. However the engine idles perfectly fine and seems like nothing is up until revved.

Any help? Thanks!!

 

[ivan129]

Pull the plugs to see if you can identify a bad plug / cylinder not firing correctly. Also do a comp test. You might have a sticky / stuck valve. A misfire when you rev the engine is a sign of 1 or more cylinders not firing due to spark or being lean. A valve stuck partially open will cause this.