Thread: backfire after injector install

To much fuel, or not getting burnt properly. My NA did it bad for a while. I have I/H/E and S4s. So, I side gapped, and indexed my plugs, and it made an instant difference. I'm running a stock bin in my nistune right now. So, my decel enrichment is stock. I just wasn't burning all the fuel. I was at .36, then the other day I went up to .40 and some popping came back. I'd check the gap on ur plugs. Run the biggest gap you can. Also look into indexing, and/or side gapping. Drivability and efficiency will increase. Vadim made a how to on this.

Thanks for your help. I'll give it a shot

JWT is known to run on the richer side anyway. They tune it safe, but with a wideband, and SAFCII you can fine tune it alot better.