Question about 1997 Jeep Cherokee Country
Ok I have a 1998 Jeep Wrangler Sahara with a 4.0L I have a Jacobs ignition system on the jeep. My problem is while I am driving and crusing along at a steady speed the jeep dies down and almost shuts off but comes back just before it shuts off. I have tried replacing the coil and coil wire still with no effect. I also took the jacobs ignition off and the problem was not as severe but the idol got rougher and when it kicked down then it was for a shorter amount of time and it did it less often. I don't really think it is my Jacobs cause it is only a year old and the ignition box is inside the jeep so it doesn't get wet cause I shorted one out before and had to get it replaced so I mounted it inside.
This sounds like the same problem the older AMC Jeeps with the 4.2 ltr engine had. Your 4.0 ltr is essentially the same engine, just re-worked for fuel injection. The problem was hairline cracks in the distributor cap, (they we're too small to see with the naked eye, but would expand and let moisture in when the engine heated up thus causing 'intermittentent' loss of power or even no spark at all). I would also change the fuel filter and then check 'fuel pressure', just to rule out any fuel related problems. Just remember that ALL engine problems are caused by a fuel, spark or timing problem. If these ideas don't help, check your ignition timing, if the spot where the light hits seems to 'waiver' (at a constant RPM), the timing chain needs replaced. This also can cause problems at highway speeds.
Posted on Nov 20, 2008
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