I have a 2001 Jimmy that started running rough out of the blue. I thought maybe it had water in the gas tank and put some heet in it as well as some fuel injector cleaner. It still continued to run rough and cut out. The check engine light started to flash and I got that checked out and was told that it could be several things like spark plugs, wires, vacum hoses etc. I changed the spark plugs and wires but it still continued to run rough just like before. I found a dried up boot on the other end of the pcv valve and replaced it. I also replace my battery. Now it will not start at all. When I attempt to start it, it only turns over without catching. Any suggestions?
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If it ran out of gas, there are two possible easy fixes. One is that the fuel filter is plugged up by junk from the bottom of the tank. The other is that water floats on top of gas and now your lines are a mix of fuel and water. I would change the filter and put water remover in the tank. Make sure there is a least 10 gallons of fresh fuel in the truck. If neither of these work, the pump may have been damaged as it uses the fuel to keep it cool.
I'm guessing you have the 6 cylinder engine and not the 8? I don't buy what the dealer told you. If you're really worried about a little water in the fuel system, run a bottle of Seafoam through the brake booster/ gas tank, that will solve any water in the system. Change your fuel filter after you do this, it will be dirty now, due to the Seafoam cleaning your gas tank. Wondering what would need to be "sealed" if there were a little water in a cylinder due to bad gas??? There are 6 coils on this engine, one per cylinder. If the coil goes bad, you would get a check engine light for a cylinder misfire and it would be consistantly running rough. Since it your problem happens intermittently, I'd check the wires going to the coil for any faults. I'd also check for a possible 02 sensor starting to go bad.
1 thought, does this only happen when ever you happen to have the defroster on, or the A/C? If so, I can help you solve your problem easily.
Try filling up a little less. To me it sounds like a vapor lock issue which clears after you burn off the top bit of gas.. Next time you need fuel up be sure to keep track of how much you put in. Another idea is to run the tank down and then only fill up to half a tank. If the problem clears then you know that you're having a vapor issue probably due to gas saturation of the canister (which can happen if you overfill the tank).
Only one question.....was the fuel filter replaced? On a jimmy the filter is usually mounted to the rail up under the passenger door on the drivers side. Sounds like there is some sort of obstruction that is preventing fuel from making it from the fuel tank to the engine. I would have thought that the mechanic would have replaced the fuel filter first thing, so maybe it has already been done. Only you and the mechanic know the answer to that one. Good luck with your problem.