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Discussion Starter #1
Yes, I am an idiot and I purchased a stage 2 Jet module for my 4.0L 1995 ZJ. After I finally got the thing installed (the coolant reservoir would not fit back after the module was installed) as well as the low-temp stat, I drove it (with premium fuel) for about 250 miles and noticed no increase in power and worse fuel mileage. To make matters worse, after I uninstalled it, the engine runs rough and still gets bad mileage. I thought maybe it darnaged the computer or the O2 sensors or something, but the "check engine" light is not on. Any thoughts or ideas on this? Do I need a tuneup or something now? I thought about having a diagnostic done, but that seems like a waste of money if the check engine light is not on....
 

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Discussion Starter #3
Wow - that's so cool. I checked it - I got code 55, so there's no apparent computer malfunction. Thanks for your help!
 
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