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If you replace enough parts, you will probably get it eventually...if you do not create more problems by trying to do it this way. It sounds to me like it would be less expensive to get the thing properly diagnosed.
With that said, it sounds like you are describing a classic crankshaft position sensor problem. That engine had a lot of problems with the wiring harness to the sensor where it goes around the bottom of the oil pan. That is first place I would look.
some common problem in the summer when car get hot over and over the ignition (coil) is affected it will make your car cold run fine but cuts off when hot if occurred look for the coil if you let car cools down for an hour then it started and work fine until cut off when hot again sure it is coil .
I also have a 91 chevy lumina with the same problem, have replaced the coil packs, throttle sensor, crank sensor and new spark-plugs and still the same problem. Also how many wires connect the the crank sensor as I have two wires that are discconected. Any help will be will better than replacing parts that I don't need to. I am disabled with MS and my car is my legs!!
do you mean wont crank over and start till it cools off? if thats the case it sounds like you got a bad crankshaft position sensor,,thge sensor is fine when its cold and warm but when it gets hot it goes open and the cars computer cant see the rpm and shuts the engine off,and then when it cools off the sensor works again and the car starts and is ok till it gets hot again,if thats the case thats what it is,,,hope this helps,,,about $100 for the part
check your cooling system,the thermostat,water level,test for cooling fan sensors and fan operation,clogged radiator test for 30-50 degrees difference from the top to the bottom of the rad,it could be clogged.Less than 30 degrees it's good.
Check for water in the oil or white/brown foam on the dip stick that would be a blown head gasket,causing you engine to over heat and cut off.
Sounds ike the fuel pump died. As they get old and your car is about that age the start to overheat after being in use for a while. They stop pushing out the fuel consistantly and then stop working all together. Sometimes letting them cool back down will allow you to use it for a short while before it dies again but in your case it sounds like it just gave out. Remember fuel in the tank helps cool the pump when in use.
change intake gaskets you will find it blown thats why your problem happens when your engine is warm the alum. intake warms up and expands opening the blown gasket
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