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RB20det misfiring during accel, smooths out during decel

MizarP
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MizarP Rookie

MizarP

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Hi all. I was driving normally and then parked to go in a store. Come outside after 20 mins and turn it on and it’s idling rough. Go to start driving and it sounds like a motorcycle almost. Missing bad under acceleration but under deceleration it smooths out again like normal. I just replaced the MAF but still have stock coil packs. I was wondering if that could be it. I don’t believe it could be like piston rings or anything because it smoothed out during decel and my oil pressure seemed fine. In fact it seemed there was no power loss either, just the really rough running. I thought it could be cause of spark jump? I ordered a set of R8 coil packs and the wiring harness from wiring specialists so I hope this fixes it but wanted to see if anyone had this happen to them or could know anything else that could be wrong. Thanks guys. (I’m attaching a video of my idle and accel and a picture of a stock coil pack)

0E08F420-B829-4E02-A0C1-107B6A40AA91.jpeg

KiwiRS4T Grand Master

KiwiRS4T

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Posted

Coil pack looks like its been shorting. First step put in some new plugs gapped down to 0.8mm. Thoroughly clean the coils and wrap with insulating tape.  This may fix it but new coils still a good idea.

MizarP Rookie

MizarP

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Yeah I’m actually not too sure myself how it was running with original coils. 2 of the connectors were also broken, and one of the pins in one of the connectors was moving back and forth. I’m happy to be getting new wiring and better coils 

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