I have a sr20det swapped s13 a weird miss accrued in cylinder 1 followed after by detonating. I unplug coil pack one detonation goes away and miss stays the same

Tried brand new injectors
New plugs
New coil pack
150ish compression across the board

No matter what I do miss and detonation stays on cylinder 1
I am just confused on what could cause this

I'd check the coil pack sub-harness connectors as well as the connectors right at the coil. It's going to be that or a bad wire somewhere.

Will check that tomorrow thank you

*also replaced fpr, fuel filter, and igniter

the converted wrote: ↑

Fri Dec 18, 2020 6:07 pm

I'd check the coil pack sub-harness connectors as well as the connectors right at the coil. It's going to be that or a bad wire somewhere.

Sub harness is fine, is reading 30 psi of fuel pressure swapped a known working walbro 255 no change, unplug coil pack miss stays the same unplug coil and injector car sputters and dies

Has spark and injector pulse cylinder 1

With the detonation, sounds like maybe some sort of crossfire issue. Is it possible you swapped-up the 1-2 coil connections or 1-2 injectors? Or if not, have you checked the harnesses for possible shorts between cylinders?

I think that the fuel pressure should be in the 45 psi range with the vac line disconnected.

If there's no change when you disconnect the coil that is calling out bad ignition to me. I'd move the coil to another cylinder and the spark plug to a third cylinder and see if the issue follows it.

Have you looked at the plugs or done a compression check on the engine?

As stated above check the 1 and 2 , and 3 and 4 coil harness. It's very easy to get 3 and 4 reversed. I ran into that issue. If I tried to start it, it would back fire very loud, or run extremely rich.

If that is the issue, Mark the coils with a permanent marker. Also, check your timing and coils.