H41, cant figure it out
Thread Starter
Cruising
Joined: Jun 2023
Posts: 14
Likes: 0
From: NJ
H41, cant figure it out
for a while my 1994 lt1 auto has been running strange with no codes but i couldnt figure it out. it would run perfectly fine cold but once it got warmed up it would be noticeably sluggish and feels like its pulling timing when you give it much throttle. The exhaust manifold will begin to glow orange (evenly across the headers) if its driven too much so i have not been driving it much at all. I finally got code H41. i already replaced the ICM, MAP sensor, both front o2s, coil, plugs, and wires. i suspect a bad optispark connection but am unsure of what to try or test next. H41 is the only code, any suggestions would be much appreciated to get me in the right direction.
6th Gear
Joined: Aug 2025
Posts: 6
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for a while my 1994 lt1 auto has been running strange with no codes but i couldnt figure it out. it would run perfectly fine cold but once it got warmed up it would be noticeably sluggish and feels like its pulling timing when you give it much throttle. The exhaust manifold will begin to glow orange (evenly across the headers) if its driven too much so i have not been driving it much at all. I finally got code H41. i already replaced the ICM, MAP sensor, both front o2s, coil, plugs, and wires. i suspect a bad optispark connection but am unsure of what to try or test next. H41 is the only code, any suggestions would be much appreciated to get me in the right direction.
Thread Starter
Cruising
Joined: Jun 2023
Posts: 14
Likes: 0
From: NJ
Thread Starter
Cruising
Joined: Jun 2023
Posts: 14
Likes: 0
From: NJ
