05-08-2020, 08:18 AM | #1 |
2018 M240i / BMS CAI / JB4 / Catless VRSF
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Rough Idle after installing VRSF Catless DP
Hello all,
I'm slightly confused in my situation. I bought the VRSF DP/JB4 combo last year from Extreme Power House and installed it without any issues. It ran fine for me. I stored my car over winter with the DP on and when I started it for the first time it ran rough. I knew this might have had to do with the fuel but I had a full tank of 90ethonal free that I had to get through. I ended up installing the stock cat and it ran much better. I ran through the full tank and added new fuel (93oct from Mobile). Bought a new gasket and vclamp from BMW and reinstalled the VRSF DP. Still had the same issue and have a video clip of how it sounds. Any ideas? [IMG][/IMG]
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Can't stop the //Addiction...2020 Misano M2CS 6MT - New Toy
2018 m240i b58 - Formerly owned / BMS CAI / VRSF DP / JB4 map 2 - 340WHP; 363TQ 2016 328i xdrive n26 - daily 2015 GMC Sierra 1500 - daily driver HEUSING240i |
05-09-2020, 11:20 AM | #2 |
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Unless it's a bad install (boost leak) or a bad sensor, idle is not affected by a downpipe.
Double-check your install and clean the O2 sensor, if that does not fix it check your MAF sensor, fuel pumps, and injectors.
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05-09-2020, 01:43 PM | #3 |
Just a dude...
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Kinda sounds like the injectors are gummed up from sitting all winter long. Maybe try a can of seafoam and long highway drive to force clean the injectors, before you jump on the expensive parts wagon.
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05-24-2020, 10:28 PM | #4 |
2018 M240i / BMS CAI / JB4 / Catless VRSF
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So I figured out that I was an idiot and had the o2 adapter in the upstream and not the downstream. Everything else was fine after I swapped them around. Sorry guys!
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Can't stop the //Addiction...2020 Misano M2CS 6MT - New Toy
2018 m240i b58 - Formerly owned / BMS CAI / VRSF DP / JB4 map 2 - 340WHP; 363TQ 2016 328i xdrive n26 - daily 2015 GMC Sierra 1500 - daily driver HEUSING240i |
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