I have a 2011 2 door jk with a MBRP catback exhaust, volant cold air intake, and a volant throttle body spacer. I used some Seafoam in the gas tank and the vaccum lines. Now it runs crappy and smells like sulfur (almost like a diesel motor). Any ideas?

 

Did you follow these steps?

Is Sea Foam Motor Treatment safe to use through a vacuum line? - Sea Foam Sales Company

 

Yeah I followed them exactly.

 

You may need to clean or replace your spark plugs now depending on how much carbon build up you had.

 

I didn't think about that. Good thinking.

 

Tap your cats a listen for a rattle. Odd odours can come from cat failures

 

There must have been some water sucked into the motor or something. I did the seafoam treatment again and all is fine and dandy.

 

The bottled liquid sea foam can cause hydro lock if too much is poured into the vacuum system too quickly. Also, sea foam can shorten the life of a catalytic converter and or the spark plugs and O2 sensors in addition to the damage the carbon release can have on those same parts. It can also be hard on the fuel pump too. Hydro locking with seafoam should be temporary if left to sit for awhile but if it persists I'd start with plugs and O2 sensors then on to the cat. However, if impact to driveability is significant, a CEL for the affected jsystem should show or the "limp home" mode should kick in. Didn't see any mention of display indicators after problem started.

 

Why is it bad for the plugs, sensor and cat? I mean scientifically. Im i terested cuz iv used it once before and have been thinkin of using it again.

 

yep. it is possible to damage the cat and you will get a sulfur smell. do not know if it will make the media loose. normally you get throw a code from the 2nd O2 sensor that something is wrong.