::::::::::::::::update::::::::::::::::::::::

I changed out the coolant temp sensor... drove her home (out of storage) and let her sit in my driveway and idle. Last time she died on me I had been driving her for about 15 minutes and as soon as I got out she just died. It seems after she has warmed up to operating temperature, if she drops below 1000 rpm she dies. Then I have to wait for her to cool down before she will start again.... Anyways, I get home let her sit idling. I go inside warm up some dinner, enjoy it and when I go out to check on her, shes dead again. The coolant temperature sensor was not the culprit...


Now what could it be? I'm really lost on this one guys/gals.



Riley

 

well .. as you probably know.. 3 things needed for the 4 stroke engine to operate. spark. fuel. air. probably not air, (compression) as i dont see how your engine could be hitting perfectly and then mechanically fail. more than likely you are loosing spark or fuel.. so find out which one it is. check for spark, easier in my opinion than checking for fuel.. take off a coil, hook up a spark tester and see if your getting spark... then if not, you have a fuel pump problem or injector driver problem.. and if you have good compression, spark and fuel, check your plugs and make sure they arent getting fouled out due to a faulty sensor..

 

since its been sitting im gonna have to say fuel is the culprit. maybe a gummed up fuel injector or fuel filter. try running some fuel injector cleaner or that complete fuel system cleaner stuff through your tank and that might help

 

I had a saab 900 turbo for a while and I had a few of these exact symptoms. Its turned out to be a wiring harness for the coil. The harness had a tiny crack and when the car got warmed up the engine vibrations would slowly scoot the harness out until it killed the car. Then it would cool down, the plastic would become less pliable and it would reseat itself.

Moral of the story, be sure to check little things like wiring harness', vacuum lines, etc. Sometimes a combination of small things can seem like 1 big problem.

That aside, I would also check fuel system. Fuel pump and pressure regulator are worth a look.

 

would a clogged cat make sense at all? I asked a buddy of mine who owns a repair shop if he had seen anything like what I'm experiencing. He thought maybe the cats were getting clogged due to the o2 sensors being out for so long. Any thoughts on that?