1988 XJ Exhaust

[jeepcrazy5722]

I have a 88 XJ, has a rough idle and stalls. Think it may be a clogged CAT. I want to put a new system in, that sounds good, improves power without busting the bank. Any ideas??

Thanks

 

[jps4jeep]

yes, replace the cat and then find the appropriate flowmaster muffler and simply replace just that. should be all said and done for around $200 if you can do your own welding. won't give you a whole lot of performace, but will fix your problem and give you a little sound

 

[mstang508]

I bought the DynoMax cat back from Summit and I'm quiet happy with it. Didn't break the bank, was easy to put on and isn't too loud. Has a very nice rummble.

 

[Bounty__Hunter]

I have a 88 XJ, has a rough idle and stalls. Think it may be a clogged CAT. I want to put a new system in, that sounds good, improves power without busting the bank. Any ideas??

Thanks

I doubt it's the catalytic converter. When they go bad, performance suffers as the engine/exhaust heat up and the catalyst expands, slowly clogging the exhaust. A bad converter will not cause a rough idle and intermittent stalling.

 

[carnuck]

More likely clogged injectors or something else

 

[superj]

i don't think its the cat either

 

[nzpete]

I would have to agree with superj

 

[superj]

have you checked for vacuum leaks?

 

[MoparMatt77]

Have you checked for cracked exhaust manifold, Intake / Exh leaks, Clogged and restricted Injectors, Dirty or bad TB or TPS? Also, Look at the spark plugs, they will tell a lot about any fuel or ignition problems.

Clogged cat and muffler generally bog down performance a little, but do not directly cause poor idle.

A better cat and Dynomax, Magnaflow, or even Flowmaster + intake do wake up Jeep 4.0L pretty nice, and can be done pretty cheap; but won't fix rough idle or running issues.