![]() Could this previous heat soaking issue cause the injector to fail sooner? I had the TSB performed and the issue has not come back over the 4 years I've owned the Jeep. I had this problem when I first bought the Jeep. There is a TSB where the dealership puts a heat shield over the #3 injector, and reprograms the ECU to make the electric fan turn on everytime the jeep is started hot. What happens is the cat converters under the manifold heat up the engine bay and intake manifold, specifically the #3 injector, which causes a misfire on a hot start. This year 4.0L engine is notorious for the heat soak misfire. What baffles me is how releasing the pressure in the fuel rail would cause it to run better after it had been misfiring. That was last week, and it has been driving fine until today where it started having the same problem. They also tested the fuel pressure, and it was within specs. They checked the coil pack, the connectors for the coil pack wiring, used dielectric grease on the connectors and verified I was getting spark. My buddy owns the shop and he looked it over really well. I even drove it to the shop with no issues. I released the pressure in the fuel rail using the little valve on the side. It helped a little at first but the misfire was still apparent. The first time it happened, I replaced the spark plugs with the proper NGK ZFR5N plugs. I get the same P0303 code each time (misfire cylinder #3). ![]() When I revved it up, it triggered the check engine light. ![]() The Jeep will start right up but will idle very rough. My Jeep has had this issue a few times on a COLD start, usually after sitting overnight. Filled up at different stations with good gas 2000 Jeep Cherokee 4.0L, Alabama cylinder head, 124k miles. ![]()
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