Ignition coil DELPHI or Denso

I’ve used both. Didn’t notice any difference. Have Delphi’s right now. Both work great for light and mid tuned setups.

I just I bought this Denso coil for my LX470. By all accounts its the exact same part and the 'yota forums agree.

Delphi will be all you need. Delphi are fine even on ST setups running 700+whp. There’s really no need for others.

Stepdad recommended replacing ignition coils, so I purchased a 4 pack of Delphi GN 10369 from amazon. Sure enough, we just replaced the coils, and boom, it ran good as new (to me).

I found some coils made by denso 673-9303 (i.e. Toyota) on Amazon for around $18 each. They've been troublefree since I put them in about 1K miles ago. My original Audi coils had 81K miles on them. They greatly improved the low speed shift quality and idle smoothness after I put them in.

I have a 2017 Forte with the regular manual transmission 2L non-GDI engine. At about 19,000 miles I started getting a strange sudden drop in RPM at random times (idle or on freeway). I would mostly notice the loss in power when it dropped and it would return to normal usually in less than five seconds. Never got any codes and car ran great 99.9% of the time.

As I approached 23,000 miles it got more frequent and finally threw a P0302 (Cyl 2 Misfire). I inspected spark plugs first. To no surprise they were in great condition. I swapped cylinder 2's ignition coil to cylinder 3, cleared the codes with my scanner, and the coders all cleared. About two days later I got a P0303 (Cyl 3 Misfire).

I ordered a Delphi ignition coil (GN10877) on Rockauto to replace the suspect ignition coil. Haven't experienced the issue since. Car also idles so well now that I can't feel it in steering wheel or hear it at idle.

I had no idea how bad that ignition coil was until it was replaced and was still shocked that it started failing at 19,000 miles.

I replaced the old ignition coil with a Denso one. The car is running great after the replacement.

Make sure to spend a little extra and get the Denso brand coil. The cheap one don't last very long.

Short answer - it was the ignition coil. In the end - it serves as a reminder that just because a code (or lack of) seems to point to a specific component, you MUST diagnose. ECM costs $300 - $1000 including coding - a Denso ignition coil was just over $100.

Put in the new coil (Denso best available here off shelf)- and did quick hook up test for spark. NO SPARK at all.