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Old 06-26-2010, 07:13 PM   #1
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Help Jeep won't run!

Well I never thought I'd be posting one of these threads

Anywho, I jerry rigged some flares (I'll post th pics in the "last person to post" thread) and decided to take it out for a spin. (this is after it was sitting for about a week)

It was idling rough like always but when I got it up to 30 mph it started sputtering like crazy, rpms all over the chart, stuff like that. I figured it was just a hicup so I kept going. then 30 feet down the road it got ok and started running right then it happened again and this time it died.

Long story short I got out and inspected everything and found the back 3" of my CAT was RED HOT.


My freaking cat is clogged again... now this happened before abd I replaced the CAT but I'm fearing that the engine may be ruining them.

So we finally get to my question. What would be causing the CAT to clog like this?

Thanks guys you rock!

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Old 06-26-2010, 07:19 PM   #2
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catalytic converters are over rated...

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Old 06-26-2010, 07:23 PM   #3
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catalytic converters are over rated...
Thanks capitan obvious but PA requires them
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Old 06-26-2010, 07:27 PM   #4
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Quote:
Originally Posted by Vaultzz View Post
Thanks capitan obvious but PA requires them
then PA is over rated
when was the last time the jeep had a good tune up? try that first, maybe run some seafoam through it and all. you could always just leave off the cat while your trying to get it running again. no need it buying a new one if you know its gona get clogged up. just leave it off so you can get it running. see if there is something you can do to unclog ur current one, then slap it back on. do that till you can figure out exactly what the problem is. but i still say give it a good tune up, make sure its running 100%(well, as 100% as a 21 year old, multi hundred thousand mile engine can be.) even if that isnt the exact problem, i dont see it hurting anything.
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Old 06-26-2010, 07:33 PM   #5
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Could be a couple of things...tune up, running rich, passing oil so on and so fourth. Like schnutzy said do a tune up, sea foam it, then adjust the carb and then if you are using oil (burning oil) then rebuild it.
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Old 06-26-2010, 09:37 PM   #6
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Just dont run one, take it on and off for inspection...
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Old 06-27-2010, 12:12 AM   #7
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Quote:
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Just dont run one, take it on and off for inspection...
that is not a good idea. they could result in hefty fines and tickets if you are caught. it is not often that a cop will check for this, but if he does you are in big trouble.




what you are dealing with kind of sounds like a converter meltdown.

Quote:
taken from Allied Muffler
The converter was super-heated due to a raw fuel condition in the exhaust flow. The excess unburned fuel ignited when it struck the hot ceramic catalyst and drove the temperature far above the normal operating condition of the converter. The ceramic catalyst is unable to withstand the extremely high temperature and begins to melt. The ceramic collapses and the converter is destroyed. The melted ceramic may block the exhaust flow and cause additional damage to the engine. A converter glowing red-hot, or evidence of heat discoloration, confirms this situation.

The condition that led to this converter meltdown could be the result of a number of malfunctions including faulty oxygen sensor, an incorrect fuel mixture, worn spark plugs or plug wires, a faulty check valve, incorrect ignition timing, sticking float, faulty fuel injectors or other ignition malfunctions.
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Old 06-27-2010, 12:19 AM   #8
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I hope its something easy like the oxy sensor. The same thing happened to the cat that was on it when I bought it. the inside was molten
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Old 06-27-2010, 03:07 AM   #9
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Like tlrrob1000 mentioned before the clogged cat is often caused by a rich condition. That could be due to an oxygen sensor. Some folks gut the cat once it clogs and reinstall it.
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Old 06-29-2010, 10:30 PM   #10
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Hmmmmm.... I'm in PA & I never ran a cat in the WRX and it was always "inspected" without it????
Hell the guy I sold it to still runs it without one???
you should really get to know your mechanic better.... its not like the cops even know what a catalytic converter looks like.....
If you want to be stealth and never get caught EVER just gut the cat out and reinstall.
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Old 06-29-2010, 11:04 PM   #11
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Check your fuel pressure. Blockage in the return line will raise the pressure at the rail causing a rich mixture.
This happened to me twice. Turned out to be the return line hitting the bottom of the tank. I had to cut 1/4 inch of the return line. I also cut it at an angle so if it bottoms out again it won't completely plug the line.
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Old 06-29-2010, 11:28 PM   #12
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Thanks capitan obvious but PA requires them
<.< >.> Gut it, and find a halfway shady place to inspect it, thats what I used to do in PA....
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Old 06-30-2010, 03:54 PM   #13
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It turns out that my CAT is fine, but my carb is hobbling along with an eyepatch, a wooden leg and some cancer So its time for a replacement

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