03-13-2024, 05:15 PM | #1 |
Misfiring on E85
Mods: LT2 manifold, Roto Fab CAI, Headers, X pipe , DSX Flex Fuel Sensor, and Tune.
Has new spark plugs and wires. Also tried moving around wires and spark plugs but no luck. The misfire only happens on E85 and when I pump 93, it goes away. Checked logs on scan tool and only happens on cold start at arounf 1,200 RPM. Seems to be only happening on cylinder 2. Cylinders 4, and 8 have maybe 10 misfires but hundreds on cylinder 2. During tune logs, Throttle body would open 56% at WOT. Saw in another forum that having a stock 87mm TB may cause the issue. Ordered a 95mm TB but want to get some feedback. Any help would be really appreciated. |
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03-13-2024, 05:48 PM | #2 |
Drives: 2017 Camaro SS 50th Anniversary Join Date: Apr 2021
Location: Missouri
Posts: 929
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E85 is harder to ignite esp cold. Thats one reason they still add 15% gasoline. Maybe weak coil on that cyl?
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2017 50th Anniversary Edition | P1X Stage 2
DSX Aux Low Side | LT4 high side | Flex Fuel TooHighPsi Port Injection (installed & tuning) CircleD 3K Stall | QA1 CF Driveshaft Forgestar F14 Drag 17x10 NT555R2 305/45/17 Rear Forgestar F14 18x8 NT555G2 235/50/18 Front 10.84@131 w/4.13" pulley ??.??@??? w/3.7" pulley (installed & tuning) |
03-14-2024, 08:05 AM | #3 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,806
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Is it misfiring enough to trigger a CEL or you are just seeing some misfires in the log? Because it's pretty normal to get some cold start misfires on E85. Part of the reason why they drop the E content down in the winter months. E likes heat and doesn't like cold.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
03-14-2024, 11:56 AM | #4 |
Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016
Location: Ocean City, NJ
Posts: 3,190
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03-15-2024, 07:18 PM | #5 | |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,204
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Quote:
It is a random misfire code? or is the check engine light continuously flashing? |
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