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| Scion FR-S / Toyota 86 GT86 General Forum The place to start for the Scion FR-S / Toyota 86 | GT86 |
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11-26-2022, 08:57 PM
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#1 |
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Drives: 2014 FRS, JRSC, Catless
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Help - 2014 FRS Rough Idle and Cylinder 4 Misfire
Hi All,
I'm trying to diagnose a problem with my car. From my log I'm getting very rough idle after startup, high misfires on cylinder 4, and shows injection mode 1. When I rev and hold the engine at 2000 rpm, then 3000rpm, then 4000rpm it moves to injection mode 3 and there are no misfires. After idling back down it again misfires in mode 1 and is smooth in mode 2. Does this mean that my port injector in cylinder 4 is bad or clogged? Here's a link to the data log. https://datazap.me/u/frs2slow/frs-ro...0&data=7-18-32 |
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11-27-2022, 03:07 AM
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#2 |
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Pulled and cleaned the injector, but still have the problem. I recently also replaced the coil packs and spark plugs as well. Thoughts?
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11-27-2022, 09:52 AM
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#3 |
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ProCrastinationConsultant
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what coil packs and spark plugs did you use?
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11-27-2022, 12:57 PM
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#4 |
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Off the line racing coil packs (and adapter harness). Denso 3536 iridium plugs.
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11-27-2022, 02:29 PM
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#5 |
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ProCrastinationConsultant
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were the spark plugs purchased locally or online?
if locally, i suspect the coil packs/adapter harness. if online, i suspect fraudulent plugs.
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11-27-2022, 05:29 PM
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#6 |
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Thanks soundman. The spark plugs were purchased from local major brand auto store. I pulled the OTLR coil pack and put the oem coil pack back on. Idling well now with no misfires in the logs. I'm going to take her out for a spin and see if all stays well. If so, looks like I got a failed OTLR coil pack and/or harness.
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11-27-2022, 05:57 PM
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#7 |
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ProCrastinationConsultant
Join Date: Sep 2013
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yeah, unless you're heavily modded/tuned, keep the ignition system oem. aftermarket doesn't play nice without supporting stuff
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