I just recently had a new catalytic converter installed in my 2006 Jeep Wrangler because the previous one started to put out a sulfur smell. The new one now smells even worse than the previous one especially when I am going up hills or have to floor it to get around people who do not know how to drive. I have under 9000 miles on it and it has a 4.0L engine in it. I have have done the following on the Jeep so far. I have an Airraid cold air intake, throttle body spacer, borla headers and borla cat back system. I have done the same kind of upgrades on my 97 Jeep wrangler with the same engine and no smell what so ever. The Borlar Headers were put in by an ASE certified mechanic. Also I have noticed since I have had the 06 Jeep Wrangler that there is a tapping noise with little or no load on the engine. I have verified that there is no exhaust leak by an ASE certified mechanic. It sounds like it is coming from the lifters or valves. It is a very annoying sound because I never heard that noise on my two previous wranglers. I have taken it to the dealership and I have been told it is normal. I have also asked around to people who have owned an 06 jeep wrangler if they have heard that tapping noise and they have said no. I am so frustrated because of these two problems have arrised on a brand new vehicle. Can you help me out please?
Could be some sort of a mixture control problem causing the cat to get hot and smell. As far as noise, Was it there before the header was installed? Sometimes the thinner walls of aftermarket headers act as a speaker, magnifying the noise
June, 29, 2007 AT 7:04 PM
The noise was there before the header was installed. I have not messed around with the mixture settings for the computer. Right now, I am going to run the engine as is until it blows or until I get the money to drop the hemi v-8 in there.
June, 30, 2007 AT 8:29 AM
I checked for TSB'S and didnt find any that pertained to engine noise. Do you have the recommended weight motor oil in the engine? Try taking it back to the dealer if it is still under warranty and complain about the noise. The bad part is if it doesnt effect driveability, they might not do much about it.
July, 2, 2007 AT 12:08 PM
I am running a 10w-30 synthetic oil in it. I have taken it to the dealership and they say it is normal. I have a hard time believing it because I have owned two Jeep wranglers in the past and none have made that noise. I have asked several times to talk to an engineer and Chrysler will not allow me. I believe as a customer I should be able to get the answers that I need.
The sulfur smell has actually kicked up a little, especially going up hills or having to floor it to get around people who do not know how to drive. I have called Airraid and Borla, they have told me their products do not affect the cat what so ever.
July, 3, 2007 AT 7:46 AM
Was it a factory or aftermarket cat that was installed?
Could possibly have a bad one.