intermittent rough idle and CEL
08-17-2015, 09:49 PM
#17
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Last edited by SouthSeaPirate; 08-17-2015 at 09:53 PM.
08-18-2015, 10:52 AM
#19
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After doing some research, it appears this type does not suffer from the breaks and cracks at the collector, and they flow well. So no need for aftermarket or replacement.
If the CATs go bad, Ill just have them gutted and get some post CAT O2 sims or maybe try some sparkplug defoulers.
If the CATs go bad, Ill just have them gutted and get some post CAT O2 sims or maybe try some sparkplug defoulers.
08-18-2015, 11:02 AM
#20
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Join Date: Aug 2010
Location: Canton, MI
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Year: 1999
Model: Cherokee
Engine: 4.0
After doing some research, it appears this type does not suffer from the breaks and cracks at the collector, and they flow well. So no need for aftermarket or replacement.
If the CATs go bad, Ill just have them gutted and get some post CAT O2 sims or maybe try some sparkplug defoulers.
If the CATs go bad, Ill just have them gutted and get some post CAT O2 sims or maybe try some sparkplug defoulers.
Generally we don't bring up deactivation of catalytic converters on this Forum.
Cat Laws:
https://www.cherokeeforum.com/f2/cat...er-laws-24337/
08-18-2015, 03:16 PM
#24
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09-16-2015, 07:34 PM
#25
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Join Date: May 2015
Location: Louisville KY
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Year: 01
Model: Cherokee
*Update*
So after I pulled the manifolds, replaced the gasket, cleaned the living hell out of the intake (it was atrocious) and replaced the previously installed Bosch O2 for an NTK, I drove it about 12 miles. Ran awesome. Next day, CEL back on. Misfires like crazy.
Finally got it on a good scanner and saw that the upstream O2 in the rear would read normal one minute, then die, then read normal again. Figured there was a pinch or break in the wire, So we ran a new wire, bypassing the harness, and voila, runs great.
Btw, Initially had an O2 grounded to chassis code... I guess it pays to know what these codes actually mean. Live and learn.
Thanks for the help from everyone.
So after I pulled the manifolds, replaced the gasket, cleaned the living hell out of the intake (it was atrocious) and replaced the previously installed Bosch O2 for an NTK, I drove it about 12 miles. Ran awesome. Next day, CEL back on. Misfires like crazy.
Finally got it on a good scanner and saw that the upstream O2 in the rear would read normal one minute, then die, then read normal again. Figured there was a pinch or break in the wire, So we ran a new wire, bypassing the harness, and voila, runs great.
Btw, Initially had an O2 grounded to chassis code... I guess it pays to know what these codes actually mean. Live and learn.
Thanks for the help from everyone.
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