I have an 84 CJ7 with a 4.2L engine, carburated, 3 speed auto tranny. Aftermarket mods include nutter bypass, msd ignition, and alarm. Last week the jeep wouldn't even crank. Battery tested good, I replaced solenoid and starter. Read on forum, that if the neutral safety switch goes bad this will happen. So I ran a ground from solenoid to the fram and bypassed the NSS. Jeep started and ran great for a week. Then while driving on the freeway, I hit a minor bump and the jeep dies. Now it will crank over and start as long as I have the key in the start position, but as soon as I return the key to the run position it does. I checked the fuel delivery and the the mechanical fuel pump and filter seem to be fine because it pumps fuel out like a champ when I'm trying to start it and have the hose that connectes to the carb disconnected and running into a bucket. So, I'm assuming it has to do with the spark. I have a volt detector that lights up when a wire has voltage, but won't give me an actual number. When I test the positive wire to the coil it lights up, but when I try to test the spark-plug like wire from the coil to the distributor, nothing.I bought a new coil from a local auto store and the same thing happens. I have checked all the grounds and fuses I can find, nothing abnormal.
Sunday, July 22nd, 2012 AT 6:21 AM