I have a 92 Jeep Wrangler and i was getting about 14mpg and now getting 11mpg? My cat was clogged and i cut it out and put a pipe in place so no cat...do you think i have another problem or not having a cat on there would make this change? thanks

most cars will not pass emissions with out them. some places may also want the catalectic convertor on the car.

Have you checked the cam sensor? Also does that vehicle have a "throttle position sensor"? Some cars use both MAP and MAF sensors, not sure about your particular vehicle but if it is one of those, cleaning the MAF wouldn't hurt. Good luck.

I remember the "Parts Replace" routine all too well from my truck. It's probably the fuel filter needing to be changed, clogging up and clogging the flow.

best advice is to cut the whole thing off and renew,yes you can remove the barrel, its not difficult but because of the damage it may not come out .when repaired always use a steering lock over and through the spokes in the steering wheel ,its the best deterrent their is, better than any boy racer sunday mechanic add on gismo that always ends up going wrong when the battery goes flat .Or awakes the neighbours when a cat takes a leak or chased by a dog

The jeep has air injection and this is part of the air pump. The cat should have two ports.. These tubes should have check valves to prevent backfire.Usually their routed up on both sides of motor and attached at the air cleaner abouts

CAT would only get clogged if you were burning a lot of oil, is the tail pipe really black?
Run a compression check on the cylinders.
What condition were the plugs in when you removed them? They will help you trace the source of the problem. Local parts houses will run the diagnostics for you at their location if you can drive it there.

If it has flanges on both ends, just unbolt it and replace. If it has welded pipes you will need to cut it off and use adapter sleeves and clamps. Really not rocket science...at worst, you may need to remove the hangars on the rear portion of the system to get enough room to install.

is engine light on. if so get code might cat conv not letting enough out. allowing to much backpressure

I had the same prblm with my 1989 Jeep, 6 cyl straight, and it was because of the EGR valve, easy to replace and not too costly. EGR valve is screwed on the motor, driver side, and there is a ±1/2" rubber hose attached. Easy to see if device comes apart, cut by rust.

This may not be your MAP but your Catlettic Converter. I also own a 92 Wrangler and had some of the same issues. My issue was actually a couple of things but they all came from a crack in my exhaust headder.

You may want to check your exhaust headder for cracks. If there is even a small one, (which are VERY common w/ YJ's) than your O2 sensor is thinking that the engine is running too lean. Therefor telling the fuel pump and injectors to dump more fuel into the engine. Well, truth is your not running too lean, in fact, you begin running too ritch.

The unburned fuel that is now comming out through your exhaust collects on the porslen screen inside your catalettic converter where it burns off, causing the screen to melt together. Resulting in a clogged cat.

The only way to fix this is to replace the ehaust headder (welding the crack will not work) and replacing the cat. This would explane your loss in gas mileage and power, due to over back pressure. The ticking sounds like the back pressure working on your valves.

Hopefully I'm wrong and this is not your issue because it is a very expencive repare. You're looking at around 350.00 to 500.00 just for a good headder and atleast 250.00 for the cat. However, an easy way to test this is to take a flash light and have a good look at your headder anywhere there are joints where pipes come together. Look for black, ashy spots above and around the joint. If you see this anywhere then I hate to tell you but this mite just be your problem.