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ShawnT
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I found the problem, two bare wires behind the TBI. It appears the wires were rubbing through on the intake manifold and shorting out. Luckily I had my head in the engine compartment as my wife was cranking the engine over. I saw an orange glow, which led me to investigate further. It appeared someone had repaired the wire before and did a poor job, leading to a poor routing angle. I replaced the bad section of wire, inspected the rest of the wires in the connector that plugs into the TBI and rerouted it. On a side note: Does anyone have a good solution to sealing the plastic valve
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So another weird question. Each time I have replaced the MAT sensor, the engine started right up and ran seemingly normal for approximately 5-7 miles and then died. Since I installed a Car Quest aftermarket part, do you that its getting ruined quickly because of a different issue? or possibly the wrong sensor? Doesn't make sense to me.
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Ok, I checked the engine compression before I saw this response. I found cylinders #1, #2, #4 to be 120 PSI. Cylinder #3 was 130 PSI. I haven't performed a leak down test yet. I also checked the fuel return line from the TBI to the tank by removing the fuel tank filler cap and inserting compressed air at a decent rate from TBI side, using an air hose. My son was on the fuel tank end stating he could easily hear the flow of air. I know, not super scientific, but seemed to work.
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I forgot to add that into my trouble shooting description. I changed the spark plugs with Champion plugs. I also checked the fuel pressure at the main fuel line coming into the TBI, which read approximately 50 psi. I then tested the fuel pressure at the TBI test port which read 14-15. I will go check compression on all four cylinders and report back. Thanks for the quick response! Shawn
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My son just purchased a 1990 Wrangler with a 2.5 4 cylinder. We noticed that it had oil leaks and coolant leaks that needed to be addressed. So we replaced the radiator hoses, heater hoses, heater core, thermostat, and thermostat housing. As we were bringing the Jeep up to temperature to ensure there were no leaks from the hoses we had just replaced, the engine died, as if it had ran out of fuel. The gauge read 1/2, but to be safe, we added fuel and tried to start it. No start. I checked for spark, and we had spark. I pulled the spark plugs out of the engine and cranked the engine ov