I installed them on my 1999 TJ about a year ago. This is the second 4.0 version I have updated the injector to. First there was a 1999 XJ and it worked great. This time I used this kit and now I keep getting injector circuit codes for literally all six injectors. The jeep still runs fine, but my gas mileage sucks. And I mean complete crap, even by 4.0 standards! I have ordered some original remanufactured Bosch injectors and will be replacing them soon.
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