Ok so a few days ago I decided to finally make the move and pull both my catalytic converters off.

I cut off the second cat right after the first one and reamed out the first one completely.
Just on the 50 mile ride home I noticed a difference in gas mileage!
The sound is something I can live with, and my neighbors will be forced to as well haha.

So, yesterday I noticed it was kind of idling a bit high at around 1600rpms instead of the normal 1100. I went out and hit some big mud puddles which resulted in a wet engine that ran bad and also the truck took a dump on my foot in one really deep puddle via a hole somewhere in the firewall.

Today it was idling high at around 2200 this morning and finally this afternoon while driving in town between jobs it started idling at around 3200! This drove me nuts and the serp belt was squeaking a bit so I didn;t know what to do.

All of a sudden at a stop light the belt started screaming and it was idling EXTREMELY high. I sopped and checked it out and decided to try and make it back to town.

2 miles from the exit a threw the serp belt and managed to limp it into a parking lot and got out to discover a coolant drenched side of the truck, coolant spraying from the overflow box, and rubber goo all over the engine.

Upon further inspection I discovered the smog pump pulley had completely seized!

A few phone calls and a bike ride later I was in my girlfriends car with a new smog pump and a belt. Just short of an hour later I started it back up and it ran fine. I shut it off and replaced the O2 Sensor as well.

Later when I came back to get the truck and was just driving it home when it started to idle high around 2200 again.

Does anyone think this may be a back pressure issue? Considering I just took the cats off.
Maybe just something got wet in the engine? I'm really confused on the matter.

Any help is greatly appreciated!

 

Ok so today my Dad welded the cat back on and I'm still having the high idle problem!

I scanned it yesterday and it pulled a few codes.

KOER Codes 12, 13, and 44.
Thermactor air system failure.

Idle speed control proble.

And failure to control idle during test.

KOED Code 34.
EGR Valve position sensor or pressure feedback EGR voltage high sensor fault.


What should I test next?
Any ideas?

Thanks!

 

Proper idle speed is 650-750rpm BTW.

Sounds like you may have a stuck or broken EGR valve, if possible clean it, if not replace it. you may also have a rusted or broken EGR tube, this will let in unmetered air and will produce an uncontrolled idle.

P.S. Cutting the exhaust off has nothing to do with your high idle problem.

 

Thanks a ton man! I though maybe it had something to do with back pressure somehow, but thankfully I was wrong.
So that's good to know, I'll try cleaning it today for sure.

I'll post up what I find.

 

Make sure you didn't knock the EGR pipe that runs from the passenger side exhaust off. I had mine break loose and it caused all kinds of headaches before I finally found it.