car shuts off
Thread Starter
5th Gear
Joined: Jul 2011
Posts: 5
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Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
You ALWAYS do diagnosis when the problem exists!!!!!!! Engines require spark, fuel, air, and compression in order to start and continue to run. You have to find out which of these vital components quits when the engine gets warm. See if there are any stored error codes. Use a timing light to see if you have spark. Pull a plug wire and bring a grounded wire close to the boot while someone cranks, you should have a snappy at least 1/2" spark. Measure the fuel pressure, it should be 35-42 psi and it should hold up for at least 1/2 hr ign off or you have leaky injector/s or a defective fuel pressure regulator. Use a noid light to see if you are getting injector pulses. Spray starter fluid into the intake and see if the engine will start and if it does, you have a fuel delivery problem.
Safety Car
Joined: Aug 2009
Posts: 3,752
Likes: 276
From: Melbourne, Victoria, Australia
Re car shuting of
Hi the fuel pump relay can be disabled by the oil pressure sensor/connector if it has come off. The fuel pump will run
(and ignore oil pressure) when first starting the car and if there is no oil pressure or sensor connector has come of will turn pump off. I had this happen on my vette, the big oil pressure sender facing up(on block behind distributor) goes to your gauges. There is a smaller pressure switch that is horizontal facing driver side just below the large sender. Check it is connected.
You can also test the fuel pump runs via the acl connector, or when you first turn ign on and not start car the pump will run a few seconds and stop as it has not sensed oil pressure.
Good luck !
(and ignore oil pressure) when first starting the car and if there is no oil pressure or sensor connector has come of will turn pump off. I had this happen on my vette, the big oil pressure sender facing up(on block behind distributor) goes to your gauges. There is a smaller pressure switch that is horizontal facing driver side just below the large sender. Check it is connected.
You can also test the fuel pump runs via the acl connector, or when you first turn ign on and not start car the pump will run a few seconds and stop as it has not sensed oil pressure.Good luck !
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Hi the fuel pump relay can be disabled by the oil pressure sensor/connector if it has come off. The fuel pump will run
(and ignore oil pressure) when first starting the car and if there is no oil pressure or sensor connector has come of will turn pump off. I had this happen on my vette, the big oil pressure sender facing up(on block behind distributor) goes to your gauges. There is a smaller pressure switch that is horizontal facing driver side just below the large sender. Check it is connected. You can also test the fuel pump runs via the acl connector, or when you first turn ign on and not start car the pump will run a few seconds and stop as it has not sensed oil pressure.
Good luck !
(and ignore oil pressure) when first starting the car and if there is no oil pressure or sensor connector has come of will turn pump off. I had this happen on my vette, the big oil pressure sender facing up(on block behind distributor) goes to your gauges. There is a smaller pressure switch that is horizontal facing driver side just below the large sender. Check it is connected.
You can also test the fuel pump runs via the acl connector, or when you first turn ign on and not start car the pump will run a few seconds and stop as it has not sensed oil pressure.Good luck !
Team Owner
Joined: Jan 2003
Posts: 20,322
Likes: 248
From: Summerland B.C. Canada
Sounds typical of low impedance injector(s) knocking out the ECM injector driver.
Ohm test your injectors when they are hot and post your numbers.
Watch Jon's video on ohm testing.
http://forums.corvetteforum.com/c4-t...questions.html
Ohm test your injectors when they are hot and post your numbers.
Watch Jon's video on ohm testing.
http://forums.corvetteforum.com/c4-t...questions.html
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Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
Hi the fuel pump relay can be disabled by the oil pressure sensor/connector if it has come off. The fuel pump will run
(and ignore oil pressure) when first starting the car and if there is no oil pressure or sensor connector has come of will turn pump off. I had this happen on my vette, the big oil pressure sender facing up(on block behind distributor) goes to your gauges. There is a smaller pressure switch that is horizontal facing driver side just below the large sender. Check it is connected. You can also test the fuel pump runs via the acl connector, or when you first turn ign on and not start car the pump will run a few seconds and stop as it has not sensed oil pressure.
Good luck !
(and ignore oil pressure) when first starting the car and if there is no oil pressure or sensor connector has come of will turn pump off. I had this happen on my vette, the big oil pressure sender facing up(on block behind distributor) goes to your gauges. There is a smaller pressure switch that is horizontal facing driver side just below the large sender. Check it is connected.
You can also test the fuel pump runs via the acl connector, or when you first turn ign on and not start car the pump will run a few seconds and stop as it has not sensed oil pressure.Good luck !
if ecm has not sensed oil pressure the engine still runs, if fp relay and fp are ok.
the switch does not "stop" anything. check some recent posts and verify for yourself.
joe
if ecm does not see pulses from dist it will shut fp relay off after 2 secs. nothing to do with oil pressure. THE WAY I UNDERSTAND IT. BEEN WRONG BEFORE.
Last edited by joe paco; Jul 10, 2011 at 12:52 PM. Reason: clarity; SPELLING!!
