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

1997 JEEP CHEROKEE
121,800 MILES • 6 CYL • 2WD • AUTOMATIC
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NEWTOJEEPS
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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?
Mar 16, 2009 at 8:47 PM
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RASMATAZ
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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-
Mar 16, 2009 at 8:58 PM
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NEWTOJEEPS
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[quote:acfc46ead5="rasmataz"]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-[/quote:acfc46ead5]

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.
Mar 16, 2009 at 9:12 PM
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RASMATAZ
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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.
Mar 16, 2009 at 9:38 PM
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NEWTOJEEPS
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[quote:f6f302efe6="rasmataz"]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.[/quote:f6f302efe6]

Ugh!! Thanks!
Mar 16, 2009 at 9:43 PM
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