quit running

[Wilbur M.]

i have a 1991corvette convertable.i had it since new.it has 18000 miles.it ia garage kept and has never been in any weather.i got it out this weekend to get ready for summer.i went for a ride and it stopped running.as this happened the radio quit and the display on the dash stopped working.i replaced the fuel pump,relay.coil,and pickup module.everything else seems to work.i hooked up a teck 1 and it showed no codes.can anyone help me with this problem? will miller

[Ken A.]

Re: quit running

Sounds like the BCM. Does it crank at all ?

[Edward J.]

Re: quit running

Wil, I would be looking for a circut that feeds power to a fuse or fuses. take a test lamp and run it through all the fuses in the fuse block
and see if there are any that are not powered up.

Was there anything done to car electrically recently that may lead you to a possiable problem?

To quit all of a sudden like that, and the loss of other equipment leads me to believe that its a electrical problem.also check out the other opitions to see if anything else is not working?

[Wilbur M.]

Re: quit running

the car cranks well.i checked all the fuses and all are good.everything on the car works,windows,locks,mirrors,lights,etc.just before filling it with gas the radio stopped playing and the antenna went down,then i noticed that the gauge for mileage range went to 0 even with the tank full.then as i was driving home it quit.nothing was done to the car before this happend.i have owned the car since new and it has always been garaged.no accidents or damage.

[Edward J.]

Re: quit running

Will, is the car still the same, no start, and everthing with the radio not working?

Have you checked for power to the coil when you turn key on?and also listen when you turn the key on to see if you can hear the fuel pump run for about 3 sec.s and then go off. I SHOULD ASK DO YOU HAVE A TEST LAMP?

[Jim T.]

Re: quit running

the car cranks well.i checked all the fuses and all are good.everything on the car works,windows,locks,mirrors,lights,etc.just before filling it with gas the radio stopped playing and the antenna went down,then i noticed that the gauge for mileage range went to 0 even with the tank full.then as i was driving home it quit.nothing was done to the car before this happend.i have owned the car since new and it has always been garaged.no accidents or damage.

Will on your first line, it cranks well makes me "wonder" if the injectors have pressurized fuel from the tank. I would have to test my 96 since it is not driven much to see if I can hear the fuel pump relay function when I turn the ignition switch to on. With my 85 I can hear the fuel pump relay function when I turn the ignition key to on, not starting the car. Have you heard your 91's fuel pump relay functioning when only turning the the ignition key to on?
Do you know anyone with a fuel pressure guage to test the fuel pressure in the fuel rail with the key in the on position?
There is another sensor/relay that monitors oil pressure and it will not let the engine run if there is no oil pressure. I need to read my 85's and 96's manuals about this.
Did you check with the facility where you bought gas if they had any complaints of water in their gas? Replacing the fuel pump you could see any water in the bottom of the tank.
You could call Gordon Killerbrew who was at the Corvette plant when your car was built. He offers trouble shooting by phone 1 800-F-Y-VETTE that you pay for.

[Edward J.]

Re: quit running

Jim, in those years the oil pressure sender had a wire the completes the a circut to let the fuel pump run, and if no oil pressure the fuel pump shuts down, and when just turning the key to on position and not cranking the engine, the fuel pump will run for about 3 seconds, if cranking engine the pump runs while cranking, it uses a RPM signal to computer to tell it to run the pump .

Water will sometimes cause misfiring while driving and generally will not cause a running engine to stop suddenly.It would have to be pumping alot of water.

I don't have a wring diagram at home, but I would suspect that something electrical, that powers the pump or ignition system.

[Joseph K.]

Re: quit running

I agree with Jim, call the gent mentioned in his email. The symptoms are unusual. If you find out what problem is let us know.

[Clem Z.]

Re: quit running

if a engine has compression,spins over then the only 2 things that can be wrong is no fuel or no spark so check and see which one is missing and go from there

[Peter M.]

Re: quit running

if a engine has compression,spins over then the only 2 things that can be wrong is no fuel or no spark so check and see which one is missing and go from there

Make certain that the car is not throwing any codes. If you are sure that there are no ECM codes, then start by checking the fuel pressure at the fuel rails. A fuel pressure gauge is about $50. You can get a gauge here or at any of the auto parts stores. http://www.ecklers.com/product.asp?p...2&dept_id=1762

If the car has fuel pressure then it is either a bad ECM module or possible a bad relay.

[Jim T.]

Re: quit running

Jim, in those years the oil pressure sender had a wire the completes the a circut to let the fuel pump run, and if no oil pressure the fuel pump shuts down, and when just turning the key to on position and not cranking the engine, the fuel pump will run for about 3 seconds, if cranking engine the pump runs while cranking, it uses a RPM signal to computer to tell it to run the pump .

Water will sometimes cause misfiring while driving and generally will not cause a running engine to stop suddenly.It would have to be pumping alot of water.

I don't have a wring diagram at home, but I would suspect that something electrical, that powers the pump or ignition system.

Edward some people in Memphis on the 1st day of May 2010 buying gas only got down the road a short ways after the purchase. Lots of rain that day, over 10 inches of rain. Local Citation Jet C650 hangered with its own jet fuel pumping station using in the ground storage could not be used Sunday 2nd of May 2010, 11 inches of rain in two days at our local airport.
A guy I went to high school with told me a story of going to a farmers place in the country where the farmer had moved to town. The farmers place had above ground storage tank for fuel. The student was stealing the gas and had left his car running while putting in the "gas" from the farmers tank. The engine died and would not start. He had to walk to town and get a buddy to come tow him home. His dad wanted to know where he had bought his gas at the next morning when he was draining the water from his tank.

[Paul J.]

Re: quit running

Wil:

While all of these posts provide good advice, many are missing the fact that the radio quit and some of the displays failed. While this can be caused by low voltage in the circuit, these are also symptoms of ECM problems (including the engine not starting). Concentrate on these two things, especially the ECM.

Paul

[Wilbur M.]

Re: quit running

i have changed the fuel pump and the relay under the right side dash.i also replaced the ignition coil and module.what i dont understand is what the radio and dash displays have to do with the car not running.i have a tech 1 and it says that there are no codes and that the key is ok.i even tried the spare key.is there any more relays that control these fuctions?i have been all over the car with a test light to check grounds and power and everything is ok.does the ecm control the radio and dash fuctions?

[Edward J.]

Re: quit running

Will, the radio and dash gages are not monitered by the ECM.(engine control module) maybe BCM.(Body control module)

Have you checked to see if its a fuel or spark problem?

[Wilbur M.]

Re: quit running

i have spark and fuel.where is the body control module?