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General Forums => The Mess Hall => Topic started by: Steve2002TJ on October 03, 2006, 07:21:03 AM

Title: misfire under load
Post by: Steve2002TJ on October 03, 2006, 07:21:03 AM

I installed my Stage 1 chip on my 2002 Jeep Wrangler 2.5 4-cylinder and it's made driving much easier. However, I'm getting what appears to be a misfire when climbing mountain roads under full throttle between 4,000 and 5,000 rpm. My TJ has approx. 36,000 miles on it and it's received routine servicing from my mechanic. I run premium fuel with a  K&N filter, but otherwise the motor is stock. Any ideas?

Title: misfire under load
Post by: yellowta on October 03, 2006, 07:34:07 AM

You need to run a higher octane gas. The chip has your timing advanced too far, and it is causing detonation. The higher the octane, the higher the resistance to detonation. With the minor miss you are describing, it shouldn't take much to correct. Try running the mid grade gas instead of the regular and see if it helps.    8)

Title: Re: misfire under load
Post by: Bounty Hunter on October 03, 2006, 09:10:40 AM

Quote from: "Steve2002TJ"

I run premium fuel with a  K&N filter, but otherwise the motor is stock. Any ideas?

Title: misfire under load
Post by: Jeffy on October 03, 2006, 12:51:39 PM

So if you take the chip out does it still have timing issues?

Title: Re: misfire under load
Post by: yellowta on October 04, 2006, 11:52:30 AM

Quote from: "Bounty Hunter"

Quote from: "Steve2002TJ"

I run premium fuel with a  K&N filter, but otherwise the motor is stock. Any ideas?

Oops, well guess you could also check your plugs.... mine had a nasty little miss under heavy load when my gap was too large :lol: