Stalling and not restarting?

POWELLGIOIEE

MEMBER
1995 CHEVROLET CORSICA
3.1L
V6
2WD
AUTOMATIC
169,000 MILES

I was tracy around 35 the car doing great as always it all of sudden acted like it was running on one cylinder and say three to five seconds shut off. Once I got parked I tried to start it it sort of started it sounded again like one cylinder and seconds before shutting off. I'm normally good with these things. I've got fuel, thought fuel pump well it's pumping, but I have no gauge to check enough pressure. I hard reset it overnight still and starting I've been asking so I went looking for crankcase sensor. I've looked where YouTube told me it was. I can't find it, and everything told me behind the starter in the back side of the motor will my starter is in passenger to the front. As I look at the motor from the radiator, the starter is left side closet to the radiator that's left in front to me. Now I can't see nothing around behind or nothing where is it, please help and if you think something else is wrong, please help.

4 Replies

AL514

MECHANIC
4,795 POSTS

Hello, have you checked to see if it has ignition spark? Thats a quick check to do. If you have spark, then deal with a possible fueling issue, if you have no spark then you go looking for the crank sensor
There looks to be 3 different possible locations for the crank sensor, that's why you're having trouble finding it, but Ill post all 3 and you can check. With the wiring diagrams.
So, service info is stating this vehicle has 2 Crankshaft position sensors, a 3x signal that is connected and powered from the Ignition Module and is on the back side of the engine (diagram 3) it's a 2-wire sensor in the side of the engine block. The other sensor is a 24x crankshaft position sensor 3 wire which is behind the crankshaft pulley (diagram 2). It's a 3-wire hall effect sensor that sends a digital signal back to the ECM.
So, it's really important to verify if there is spark or not. Or if this is possibly a fuel pump failure.
There are also 2 Technical Service Bulletins that can relate to the issues you're having. Diagrams 5,6,7 have to do with the Fuel Injectors clogging up and considering the age of the vehicle they should be tested with a Fuel Injector balance test.
The diagrams 8,9,10 is for an updated Spark Plug wires and Ignition Module. There can be any number or combination of things happening here.

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

https://www.2carpros.com/articles/how-to-test-an-ignition-system

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

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Saturday, June 10th, 2023 AT 12:26 PM

POWELLGIOIEE

MEMBER
5 POSTS
1995 CHEVROLET CORSICA
3.1L
V6
2WD
AUTOMATIC
169,000 MILES

Running down the road car running good Just then it acted like it lost five cylinders and shut off within five seconds at the most. Okay, I bring it home ask a hundred questions what would cause this most said fuel pump. I checked the fuses I bought. Just the pump put it in the old holder and reinstalled tank hooked it all up still nothing. Okay, so, I decided to check connections down by the tank no power or I'm not testing the right thing. I have old school basic mechanical knowledge. I don't know anything about any kind of electronic on a car I don't know what or where to check and I'm hoping you can tell me in detail good pic on what to and where to check. Back by the tank two things are plugged in to a thing that looks like it's hooked up under back seat, but one set goes to brakes and other goes to tank. I'm getting no juice to either one as I can tell. Help me, I cannot afford a person to do it for me. Thank you so much I've tried to find the crank case sensor, can't find it can't find a fuel relay, haven't located either one, I hope I'm not bothering you. Give me a 59, 60, 79 car it would be running by now it's been two months cause can't afford a mechanic.

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Monday, August 14th, 2023 AT 12:45 PM (Merged)

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi:

If you are certain the fuel pump isn't running, then let's start by testing our power supply.

The fuel pump and fuel injectors get power from fuse 16 in the fuse box. Power from that fuse goes to the fuel pump relay and waits for the relay to be actuated. The relay is located at the right rear of the engine compartment behind the strut tower.

First, check the fuse. make sure there is power to and from it. Here is a link you may find helpful.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuse checks good and has power, we need to test the relay and relay circuit. Here is a link that explains how it is done.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I attached a portion of the wiring schematic below showing the fuel pump circuit. Note the dark green wire with a white tracer. That is the power supply to the primary side of the relay. Power to the secondary is from the aforementioned fuse.

Do this and let me know what you find.

Take care,

Joe

See pics below. I highlighted relevant wires. Pic 3 shows you what fuse to check. Pic 4 shows the relay location.

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Monday, August 14th, 2023 AT 12:45 PM (Merged)

POWELLGIOIEE

MEMBER
5 POSTS
1995 CHEVROLET CORSICA
3.1L
6 CYL
2WD
AUTOMATIC
160,000 MILES

Okay, I replaced my fuel pump, that now I don't think was the problem. I put the tank back in and it was still not starting so I decided to check to see if I have power at the fuel pump. The answer is no. My question if My fuse is good where do I check to see what it could be. Now I thought of this emergency shut off, if you get in a wreck it shuts power off to the pump if I have one where's it at or where and what do I check. I can't find a wiring diagram that's Just for fuel I know it goes from ignition to fuse box after that I'm lost. Help me please.

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Monday, August 14th, 2023 AT 12:46 PM (Merged)