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Unread 06-26-2014, 10:20 PM   #1
reynoldsjp
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1998 ZJ 
 
Join Date: May 2013
Location: roanoke, va
Posts: 31
sputter ans bogging

1998 grand 4.0 new fuel pump and cps. after fuel pump was running fine for awhile. now after getting up to operating temp at speeds higher than 55 it is sputtering an bogging down unless speeds are kept below 55 ala speed movie im looking at oxygen sensors and cat also im hoping its not the trans any ideas before I start throwing money

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Unread 06-27-2014, 06:46 AM   #2
Kingr98
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1998 ZJ 
 
Join Date: Dec 2012
Location: Madison, AL
Posts: 372
What brand fuel pump did you put in it? Also, as you already suggested, a clogged cat can cause your symptoms.
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Unread 07-05-2014, 07:55 PM   #3
reynoldsjp
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1998 ZJ 
 
Join Date: May 2013
Location: roanoke, va
Posts: 31
update ...

sorry for the delay in response. we used an airtex I think . it will set in park and rev just fine has power and works at lower speeds. we have changed the o2 sensor in the exhaust next to the block . that was not fun. it was cross threaded. so it was still having issues. check engine code pointed to the o2 sensor we changed it went out after we changed it. also did a complete flush and fill of coolant system. thought maybe it had something to do with issue thermo was bad as well so changed it during flush. ran good for a day did the issue only once . we are going to tackle the cat and o2 there next. gotta love jeeps.
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Unread 07-05-2014, 09:16 PM   #4
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Location: Sweet Home, Alabama
Posts: 6,057
if you have a vacuum gauge you can check for a badly restricted exhaust. if it is plugged the gauge will go to towards zero while rpms are increased.

the exhaust backs up into the engine, passes through the valve train and causes the vacuum to drop.
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