Quote:
Originally Posted by 302SS
How could I test the injectors / HPFP? I've been thinking injectors since the start of this, but have been trying the easy things first (battery- knew it was old. Sparkplugs - were fouled. Sparkplug wires- old. Then I found a loose MSD intake, and thought maybe that was it, and it wasn't...)
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Have you resolved this issue? My stock, except Holley CAI and oil catch can, '17 2ss with 15k miles is doing the same thing, random misfires (not all the time, but seems to be progressively more frequent), not enough to trip codes or trigger the check engine light. Runs rich on cold startup (black smoke out exhaust). Checked fuel trims and getting negative values.
Does checking the resistance of coils generally result in accurately identifying a bad coil?