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2003 OLDSMOBILE ALERO will not start?

It just cranks. what should we do. already set security,checked for firing of plugs and fuel pump pressure 0 psi.put in on position, listened, and didn't here fuel pump kick in???????

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The next step would be to check for power to the pump. You will see a grew wire (the larger of the two if there are two grey wires) in the harness that goes to the pump. There should be power for 3-5 seconds when you turn the key on and anytime the engine is cranking. If there is power than you likley have a bad fuel pump. If there is not power let me know and I'll get you some more info.

Thank you for using

Posted on Feb 10, 2012


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well, usually in this case, if your coolant resovior is full and you are still holding psi in your system, it is a bad thermostat. what the thermostat does is when the engine block heats up, the coils of the thermostat expand and let coolant through to cool the engine block. so what might be happening is your thermostat is bad, and not letting coolant through, which will cause your motor to over heat.

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make sure your cap and rotor timing is correct double check spark plug routes (mistakes happen). maybe your timing is off in general.

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SOURCE: what is the diagram for 1999 oldsmobile alero


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I have a 2004 Alero ( similar procedure in your model as well ) and I just figured out today and replaced my throttle position sensor. I'm not sure what the black plastic "box" is called that is above the throttle assembly...but I had to remove that to get to the throttle position sensor underneath. If you can locate the two wires that control the throttle assembly...then the throttle position sensor is on the other side of the throttle assembly. I had to remove the large tube that went from the air filter to the black plastic "box" above the throttle assembly. Also disconnected anything else connected to that black plastic "box". Then pulled that "box" up and right there on the left side of the throttle assembly was the throttle assembly sensor. Here is a web page with a picture that helped me figure out where it was :-

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

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on the 3.4 liter engine, it's behind the harmonic balancer--you have to remove the crankshaft pulley/balancer to see it.

if you have the 2.4 liter, it's just above the oil filter:


Posted on Nov 13, 2010

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1 Answer

2004 what might be the problem for car not starting

Do you have spark at plugs when it will not crank and run ?

Nov 25, 2017 | 2004 Oldsmobile Alero

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2002 Old ALERO drove home find didn't start later turned over fine but didn't fire replaced fule pump about 2 months ago

Pull a plug wire , set the end close to the engine, crank it and watch for spark. No spark could be the cranks sensor, wires, ignition module , fuse, or PCM. Have the codes read. Could be the fuel pump too. I have had them die shortly after installs.

Aug 28, 2016 | 2002 Oldsmobile Alero

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I have a 2003 Oldsmobile Alero 3.4L that wont start. I have done fuel pressure test 50-55 psi and plugs have good spark. However when done light test on injectors there is no response so there is no pulse....

Is the security light staying on ?
Usually the engine will not crank and you have no power to the fuel pump if the security system is disabling the car.
No injector pulse but spark would point to the computer since both use input from the crank and cam sensors.

Dec 22, 2012 | Cars & Trucks

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clogged injectors, clogged fuel filter, or the pump may have pressure but may not be enough pressure. not sure what the rated PSI should be but the parts store can guide you with that. I would unhook the fuel line just past the filter and make sure fuel flows through it when you turn the key on. if it does you know its not the filter.

Jul 16, 2012 | 2003 Oldsmobile Alero

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2003 Oldsmobile Alero will not start. Already replaced fuel pump and screen, spark plugs and wires, fuel filter and relay. What else could it be?

I have a 2003 alero that would not start. It was actually a security problem it locks itself up, there is a quick fix for it though you turn the car to the on position wait 10 min. turn it off for 5 sec. and then turn it over and it should start. Sounds to easy right, thats what I thought someone found it out for me online before I had to throw a bunch of money into it, like others have. HOPEFULLY this will work for you too.

Jan 31, 2011 | 2003 Oldsmobile Alero

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Im not sure if you got your alero to start yet. But heres an Idea, The alero comes with a security feature that if you have 3 failed starts it activates. a good sign of this is while having the key turned does your security light flash on the dash. if so turn the key forward with out starting the car and leave it on for 10 minutes and then the security light on the dash should stop flashing. Now turn the key off and remove key stick key backin and turn over to start car. Did your car start ??

May 10, 2010 | 2003 Oldsmobile Alero

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