My TJ has an occasional cylinder 1 misfire indicated by the check engine light and an occasional lurch at highway speed. I have noticed the misfire when cruising at highway speed after driving about 20 minutes and feeling a sudden lurch, or when sitting at a red light idling. The engine runs fine aside from the occasional lurch and running rough at idle. I suspected a sticky lifter so I ran Sea Foam in the oil for about 2k miles and then changed the oil and filled with 10w-40. I never noticed a misfire on the highway after this, but it idles rough at stop lights and the check engine light came back on at a stoplight. It will probably turn off if I drive the highway a few times. Wondering if there's an interim fix to get by another 6 months or year without getting stranded by this thing. It's a 1998 with 250k miles on it, but I'm trying to put off replacing the engine due to the expense and I'm not sure it's worth it on a vehicle this "used". Is there any chance an even heavier weight oil is a temporary fix? Or is this engine shot and needs overhaul or replacement?
4.0L Jeep Six: Cylinder #1 Misfire Trouble Code
in Jeep® YJ Wrangler, TJ Wrangler and LJ Wrangler
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My TJ has an occasional cylinder 1 misfire indicated by the check engine light and an occasional lurch at highway speed. I have noticed the misfire when cruising at highway speed after driving about 20 minutes and feeling a sudden lurch, or when sitting at a red light idling. The engine runs fine aside from the occasional lurch and running rough at idle. I suspected a sticky lifter so I ran Sea Foam in the oil for about 2k miles and then changed the oil and filled with 10w-40. I never noticed a misfire on the highway after this, but it idles rough at stop lights and the check engine light came back on at a stoplight. It will probably turn off if I drive the highway a few times. Wondering if there's an interim fix to get by another 6 months or year without getting stranded by this thing. It's a 1998 with 250k miles on it, but I'm trying to put off replacing the engine due to the expense and I'm not sure it's worth it on a vehicle this "used". Is there any chance an even heavier weight oil is a temporary fix? Or is this engine shot and needs overhaul or replacement?