Swapped a 98 LS1 into my Jeep a few years ago, had some mods already done to it:

LS6 Intake/ Stock TB
LS6 243 casting heads "untouched"
LS6 Oil Pump
LS6 Factory Replacement Timing Set
Roller Rockers 1.7 ratio
LS7 Lifters
7.45 inch Chromoly Pushrods
Patriot Gold Extreme .660 lift springs
Titanium Locks and Retainers
228/232 .600/.600 lift on 111LSA camshaft
.040 Cometic Headgaskets
ASP 25% Underdrive Crank Pulley

I swapped in a factory cam, bought a computer / harness and had it tuned to delete rear O2 sensors. Never got it running after the swap, and it sat for a few years while I was out of the country. Came back and got it running, left it with open headers & forward O2 sensors for a few more years. Started it about once a month, charged the battery when it died.

About 6 months ago, I swapped in a new dash and wiring harness for the entire Jeep. Put pipes and mufflers on it, true duals with no cross. Had a shop tidy up some wiring stuff I couldn't figure out. Ran decently well, leaked some oil and exhaust smelled like fuel. Fixed the leaks, got it "street legal," drove it around.

1 month ago, I took it to Cunningham Motorsports in Murrieta, CA to put it on the dyno and tune it, with the hopes of making it not smell like fuel anymore. It does run better now, but still stinks terribly. It is a soft top, and the pipes exit straight out the back under the bumper, so after even a short 5 - 10 minute drive my clothes stink like exhaust and i need a shower to get the smell off me.

I don't think cats will fix it. I think it is running rich and the cats will just get clogged and fail after a few months. The exhaust shop I took it to did an excellent job, I searched for leaks with soapy water and found nothing.

What gives? Open to any and all suggestions. My Jeep is a registered antique in Virginia, so no I do not have to CA smog it. I'm sure I've left out something so feel free to ask.

 

What are the O2 and WB readings?

 

Not really sure how to tell that, but here's what the Torque app is telling me.

 

You don't have an AFR reading from the dyno? The tuner should easily be able to tell you what your AFRs are and weather or not you're running rich.

Also, by O2 readings I meant your trims (STFT or LTFT).

 

Here's the dyno sheet, no idea if that's on there.

 

I'm hesitant to say it but I think the dyno shop screwed me. That's what I'm really here trying to figure out. Should the tune have fixed the smell?

 

AFR looks good on the dyno, and with the Torque app you should be able to monitor STFTs and LTFTs on both banks. That will tell you what sort of fueling you got.

You should probably check for exhaust leaks and cats will indeed help.

 

Not sure what test that is or what's going on there, but basically STFT and LTFTs are PIDs that you select and then scan. They will tell you how far off your fueling is from normal.

 

First one is at 190°
Second one is at about 170° with rpms up then back down

 

Seem normal to me, no reason to believe it's running abnormally rich.

A combination of catless and possible exhaust leak can definitely make it reek of fumes.

 

Hmm. Alright thanks for the assistance, I'll try the cats!

 

No cats and a cam with 8 degrees overlap will cause the fuel smell....normal.

 

He said he swapped in a factory cam. But I agree even with a stock cam the catwalk wreak of fuel with no cats