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2001 Olds Aurora: V6..Various intermittent electrical issues..cranking…

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2001 Olds Aurora, 3.5 V6...
2001 Olds Aurora, 3.5 V6. Various intermittent electrical issues. Most important is that the car often takes 2-3 seconds of cranking to start. Local dealer suggests changing 2 crankshaft sensors. Called the service staff where the car was originally purchased and they told me there is only one crank sensor!
Submitted: 6 years ago.Category: Oldsmobile
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Answered in 1 minute by:
3/2/2012
Oldsmobile Mechanic: GM Tech Cam, Oldsmobile Certified Technician replied 6 years ago
GM Tech Cam
GM Tech Cam, Oldsmobile Certified Technician
Category: Oldsmobile
Satisfied Customers: 30,401
Experience: 14 years Automotive experience all with Gm.
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Bluegorilla :

Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.

Bluegorilla :

Does it lack power when you go to pass?

JACUSTOMER-7s2o3imk- :

The car in general is not powerful, but there is no difference when I accelerate to pass.

Bluegorilla :

when did you last change the fuel filteR?

JACUSTOMER-7s2o3imk- :

I don't know. The car was fully serviced (not sure what that entails) in September of 2011, before it was given to me. It was my parents' car - a gift.

Bluegorilla :

with your 3.5L there is one sensor only, but the 4.0L does have 2 sensors.

Bluegorilla :

I would think a bad pump check valve would cause the hard start.

JACUSTOMER-7s2o3imk- :

I'm not a car guy, but it doesn't strike me as a mechanical issue at all. Everything on the car works wonderfully except the electronics. The acceleration power is fine.

Bluegorilla :

Ok, if the pressure drops when off then it needs to build pressure again to start and that can take a few seconds of cranking and the system will operate properly otherwise.

JACUSTOMER-7s2o3imk- :

Are there any other possibilities?

Bluegorilla :

none that fit your symptoms

JACUSTOMER-7s2o3imk- :

So the service department's conclusions are wrong?

Bluegorilla :

the crank sensors do cause issues, but I honestly have serious doubts.

JACUSTOMER-7s2o3imk- :

would there be any other symptoms of a faulty pump check valve?

Bluegorilla :

No, when the pump is running we are not concerned about the valve.

JACUSTOMER-7s2o3imk- :

ok, tell me more about the fuel filter issue you mentioned first. i guess that would have an impact on starting the vehicle, what about while it is running?

Bluegorilla :

Not when running. The check valve has one function, to keep the system primed when the pump is not running.

JACUSTOMER-7s2o3imk- :

the check valve and fuel filter are two different things, yes? in the beginning of our conversation you asked me when was the last time i changed the fuel filter.

Bluegorilla :

Yes the check valve is in the pump and the filter is in the line.

Bluegorilla :

Often times a plugged filter will cause the pump to fail

Bluegorilla :

still with me?

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