After a ton of reasearch I found something called the Chrysler Dodge and Jeep Performance Modules. They have them for the 3.7. Are these things any good?

http://www.jetchip.com/Shop.asp?catID=1&Redir=Modules

My truck is running very rich and I am trying to see what I can do to help it.

I may also just replace the 4 o2 sensors to see if that makes a difference.
Also I have the cel that says something is going on with the cat but I will doubble check tomrrow.

 

If your truck is throwing a code, no programmer or chip will help make it function properly .

I'd suggest fixing the o2 sensors or the cat (whichever needs it) and then looking at performance upgrades.

As far as the Jet chips go, theres a few threads around here about em, most of them saying they're not really that great of an option.

 

Well I want to get nice exaust system and a kn cai. But I have people telling me that due to opening it up its gonna make the computer do different things like increaseing the amount of fuel because of the less restence at the intake and less back pressure at the exaust makeing it run like crap. So I was thinking that chip was the onily thing I could do to fix that in my 3.7?

 

Well you said you had a check engine light... I'd fix that problem first before anything else.

I've got a CAI and a magnaflow exhaust and have had no issues with the stock system adjusting to the increased flow rates.

 

IMO Don't waste your money on Jet Chips not worth it!
I have one and there was No noticeable gain.

 

Id replace the O2s. You should only have to replace to pre-cat upstream sensors as those are the ones that fluctuate the fuel mixture. The ones after the cat are there to make sure the cat is working.

 

Ok guys thanks for all your help, I think I found the culprit.

P0420 Calastyst System Efficency Below Threshold (Bank 1)

IMG01177.jpg

My best gess would be the upstream o2's are giveing a false reading causeing the truck to run rich and also make the truck think the cat is not working correctly.

Me and my dad's mechanic think we should just drop the whole setup. Replace all 4 o2's on the truck and re connect the y pipe. That way we dont have to worry about the problem coming back. Autozone also said they would also sell me all 4 o2's for under $100

 

I would look at your drivers downstream O2 sensor first, and if that doesnt fix the problem then there may be something wrong with your cat. If the fuel mixture was off, then I would assume there may be a problem somewhere in the engine, but if the first O2 sensor on bank 1 is reading properly, then chances are the cat or downstream O2 have failed.

 

What could be rong with the engine to make it run rich? The spark plugs and coils are new?

 

When you replace your O2s, just stay away from Bosch. Some have had problems with those.

From what I can tell, your truck isnt running rich because of any problem other than the O2s or cat. Are you getting any other codes except for P0420?

The upstream sensors should be fine. If youre just looking for a quick fix to the problem, I would replace the O2 on the drivers side after the cat.

You have 2 O2 sensors on each bank, 4 total, 2 before the cats and 2 after. The 2 before the cats (upstream) tells your engine the oxygen content so it can adjust the fuel mixture accordingly. The 2 after the cats (downstream) go to the computer with an oxygen reading that will indicate whether or not the cat is running effienciently. Normally, when you replace O2 sensors the only ones that need to be replaced are the upstream. If your downstream ones arent setting a code, then they are fine. That is not the case here.

Your drivers side downstream should be able to be replaced without dropping the system. I would replace that one O2 before anything else. All other O2s will require some work to get to, but that one is in an open spot. If you replace the O2 and you still get a code, your cat is bad.