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I have a 2004 Jeep Wrangler X 6 cyl, 4.0L? When I fill up the tank w/ gas the check engine light comes on. It eventually goes off, but it seems to use more gas when the light is on. I took it to advanced auto and they said the code showed a bad Throttle positioning sensor. I replaced it today. I then went and got gas and the check engine light came on again. Any ideas?
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if you just filled up i might be dirty fuel go get some fuel injector cleaner stp is good, lucas is better dump in your tank and cross your fingers you might have to start up a couple times.
have u ck out the ignition switch [not the key & tumblers],, or the neutral safety switch to see if u have power ,,also seen broken wire at solenoid on starter too,,hope it helped,,
It could be the pump but you need to verify if you can hear the pump running after it stalls and you turn the key back on to try and start it. If you don't hear it it isn't running. The pump is inside the tank but it dosen't come inside, you need to put it in there. That requires removing the tank. On a 90, there is a filter mounted on the chassis near the left rear tire. I'd replace that first as if you replace the pump, that should be replaced as well and if it's plugged up it may in fact be the only problem.
Sounds like a pressure leak in the fuel system. For a sure fix, have a mechanic scan the system -- your car's computer sets a trouble code each time the check engine light comes on. For a quick, inexpensive fix that will more than likely eliminate the problem, replace your fuel filler cap.
the gas cap and check engine light thing are related in terms of the EVAP system, or the evaporative emisions system. This is NOT where your surge, or "chug" is coming from. The surge could be coming from a Exhaust Gas Recurculation valve that is starting to bind or "hang up" a bit. DO you notice this happens more at lights, or when coming to a stop? if so it could be an idle air control vavle.
You have a cylinder misfire. You need to check the distributor, wires, and pull the plugs because something is not firing the fuel mixture in one or more of your cylinders at timew. you can do the plugs yourself for the most part. I dont know how the 6 cyl looks in the engine compartment of the wrangler, but from my experience with a 96 XJ, number 6 cylinder is very difficult to get to because of the interior air intake vents. if all the plugs seem fine, you may want to take it into a shop for a distrubutor and wire check
Have you taken it to your mechanic to run the diagnostics... I had the same issue and it turned out to be a vapor lock issue that required a gas tank gasket replaced.
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