It was making a loud sound at the front of the engine and vehicle kept on turning off?

OSCARROD73

MEMBER
1991 BUICK RIVIERA
6 CYL
2WD
AUTOMATIC
120,000 MILES

So I own a 1991 buick riviera and it was making a loud sound at the front of the engine and vehicle kept on turning off. I thought it was the water pump bearings so I replaced the water pump. No luck what so ever. After it turns off I shake some harnessed wires that are located on the front of the ignition module where the spark plug wires are connected to. I had the harmonic balancer replaced on it because buick dealer said balancer was broken. $600 later, vehicle now seems to backfire and still turns off. I love this car but my wife doesnt. I dont want to get rid of it but dont want to keep spending more money than the cars worth. Can anybody help me please?

1 Reply

SQM

MECHANIC
6,383 POSTS

Hello,

Just to clarify, currently you do not have the loud noise, right?
And the engine will start and then all at random?

This engine stalling can be due to a faulty crankshaft position sensor. The crank sensor sends the engine revolution data to the ECM and a faulty sensor will send incorrect data and that could trigger an engine shutdown.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.

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