smog check (i need help)
05-02-2009, 07:54 PM
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Year: 1990
Model: Cherokee
Engine: 4.0 Inline 6
smog check (i need help)
i have to go get my 1990 cherokee 4.0 inline six checked for smog. i know it will not pass. my friend put it on his to check it. it failed. what can i do to get it to pass smog
05-02-2009, 08:10 PM
#4
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Year: 1991
Model: Cherokee
Engine: 4.0 I6
Also check your O2 sensor (I think 90 models had one), tuneup, clean the throttle body and intake, check cat converter maybe replace it, clean vacuum lines/system, also might replace the EGR valve.
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