1998 Jeep Cherokee exhaust smell when idled

Tiny
BIGWENN
  • MEMBER
  • 1998 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 168,000 MILES
Jeep Cherokee 1998 sport 4.0 6cyl. 168,000 miles, when idle I can smell exhaust it has slight sputter and rough idle. In the past have had codes 700,740,171,133 as of now my engine light is off. 2 days ago I had tune up replaced pick up plugs and wires rotor and cap, oil change, air filter, throttle removed and fully cleaned. This caused my engine light to turn off. Car has been running smoothly until I smelled exhaust while in traffic moments before I noticed a slight sputter. Up until now I have replaced both 02 sensors, had my fuel injection cleaned by Tune Up Master all lines have been checked for leaks there are none PLEASE WHAT CAN IT BE? Thanks for your time. Yesterday I began to use 89 unleaded instead of 87 if that could be of any help I changed my cat converter last week I no longer smell exhaust but, engine light came back on it idles a little I noticed my power steering pump has a slow leak and it appears to be dripping onto my 02 sensor ODB code read 171,740, and 700 need help
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Friday, July 31st, 2009 AT 10:49 PM

3 Replies

Tiny
2CEXPT
  • MEMBER
1998 Jeep Cherokee exhaust smell when idled

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode
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Friday, July 31st, 2009 AT 11:28 PM
Tiny
BIGWENN
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Thanks for your in put I will check these things do you think any of this can be due to a bad cat converter? Just curious.
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Saturday, August 1st, 2009 AT 9:05 PM
Tiny
2CEXPT
  • MEMBER
Could be to find out do a backpressure test on the exhaust system
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Sunday, August 2nd, 2009 AT 6:10 PM

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