1997 Jeep Cherokee Exhaust fumes/check engine light in 97 J

Tiny
NEWTOJEEPS
  • MEMBER
  • 1997 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 121,800 MILES
I need some advice. I just bought a used 97 Jeep Grand Cherokee Limited. It ran fine but I was told the exhaust manifold was cracked and the VIC said "coolant sensor bad". I took it in for an oil change and to replace the sensor and replace the serpentine belt. The mechanic told me the sensor was fine, but it was running too cool so probably a bad thermostat. Turns out there was no thermostat in the jeep at all and the housing was in bad shape. So they installed a thermostat and a new housing. Now it runs rough, the "service engine" light came on. I took it back and they told me it may take 3 cycles of running for the computer to reset itself with the proper levels. I drove it around for a while and now I have bad exhaust fumes inside! Especially when I run the A/C. I know I have a crack in the exhaust manifold but I didn't have the fumes before todays fix. Any ideas what could be causing this?
Monday, March 16th, 2009 AT 8:47 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Service engine" light came on. This light coming on means the computer has identified a problem within the engine management system and needs scanning to find out what's really going on within the parameters and actuators-
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Monday, March 16th, 2009 AT 8:58 PM
Tiny
NEWTOJEEPS
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  • 3 POSTS
When I took it back they did scan it again with one of those hand held scanners and the only code was that it was running rich.
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Monday, March 16th, 2009 AT 9:12 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Rich condition

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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Monday, March 16th, 2009 AT 9:38 PM
Tiny
NEWTOJEEPS
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  • 3 POSTS
Ugh! Thanks!
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Monday, March 16th, 2009 AT 9:43 PM

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