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Showing results for tags 'jeep 4.2l distributor'.
Hello all. Newby on this forum. I'm dealing with a '89 Wrangler with the 4.2 and an auto trans. The rig has about 165,000 miles and I don't believe there has been any work done to the 4.2. The original BBD stepper carburetor has been replaced with a non-stepper BBD, but all else appears factory. The owner has not been able to get the rig through emissions testing and has asked me to help. I am not overly familiar with the 4.2 and much of the information I have seen seems contradictory, so...Here is where I ask for your help. The base timing will change by merely revving the engi