I purchased this car 1.5 years ago and it has run like a top-only 50,xxx miles. The older folks we run with here in Florida just love it. Easy to get in and out of and it is very stately being the presidential style.
It recently began to hesitate, stumble, no throttle response and then die after running the car for 20 minutes. It seems this is occurring when the car gets up to operating temp. If I wait 20 minutes it will again run great until it gets warmed up again and then the same thing occurs. On a couple of occasions I thought I smelled unburnt fuel when this happened. Doesn't smoke or backfire. Doesn't seem to be overheating although not equipped with a temp guage it has an idiot light that does not come on. It doesn't smoke or backfire. The onboard diagnostics computer (OBD I or ALDL) is not throwing any codes.
After doing a lot of research I thought it was a fuel mixture problem so changed out the oxygen sensor, temp sensor that feeds the computer and new plugs and wires without any improvement. I hate throwing parts at it without knowing what the problem is. I ordered a bunch of regular maintenance items (EGR valve, fuel filter, rotor distributor, thermostat etc,etc) thinking it's 29 years old and I don't have a lot of history on it and it will need replacement. But what's mentioned above is all I've replaced so far.
Any ideas on what the gremlin(s) are is greatly appreciated! I do hear a click from the fuel tank when turning the engine key to on and it does start up without any problems. Thought about the catalytic converter being plugged but it only has 50,xxx miles and runs great until warmed up.
It recently began to hesitate, stumble, no throttle response and then die after running the car for 20 minutes. It seems this is occurring when the car gets up to operating temp. If I wait 20 minutes it will again run great until it gets warmed up again and then the same thing occurs. On a couple of occasions I thought I smelled unburnt fuel when this happened. Doesn't smoke or backfire. Doesn't seem to be overheating although not equipped with a temp guage it has an idiot light that does not come on. It doesn't smoke or backfire. The onboard diagnostics computer (OBD I or ALDL) is not throwing any codes.
After doing a lot of research I thought it was a fuel mixture problem so changed out the oxygen sensor, temp sensor that feeds the computer and new plugs and wires without any improvement. I hate throwing parts at it without knowing what the problem is. I ordered a bunch of regular maintenance items (EGR valve, fuel filter, rotor distributor, thermostat etc,etc) thinking it's 29 years old and I don't have a lot of history on it and it will need replacement. But what's mentioned above is all I've replaced so far.
Any ideas on what the gremlin(s) are is greatly appreciated! I do hear a click from the fuel tank when turning the engine key to on and it does start up without any problems. Thought about the catalytic converter being plugged but it only has 50,xxx miles and runs great until warmed up.