Question about 2003 Oldsmobile Alero

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Injectors have no electric

I have no power to the injectors on my 03 olds alero. i have checked all the fuses, and replaced the crankshaft sensor. the engine will start if i put some gas into the throtle body. the injectors have the right resistance. i used the niod light and have no power.

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  • 102 Answers

First thing to do is use a test light at the injectors, check to see if you have constant power on 1 side when key is on, you should, if so the computer is not sending a ground to the injectors, or a possible broken wire or bad connection somewhere

Posted on May 17, 2009

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2 Answers

Engine turns over but wont start. You can hear thr fuel pump come on. Is it electrical? Could it be battery, fuse, or loose wire?


This sounds like the crank shaft sensor is bad. The sensor sends a signal to the computer about when to fire the coils for spark.

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My 2000 Oldsmobile Alero will turn over but wont start...any solutions to this problem? I did recently replace the crankshaft position sensor.


my sister in-laws did the exact same thing. we replaced fuel filter pump and injectors. All the time it was old spark plugs. It kept cranking but wouldn't start. spent less than $20 on new spark plugs and it fired right up and is still running strong

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1 Answer

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It depends on which crank sensor you are wanting to replace. There are two of them. The 24X sensor is located behind the front crankshaft pully and the crank pully must be removed to change it. The 7X sensor is located in the engine block on the right bank (firewall side) near the rear of the engine. This one simply pulls out of the block after disconnecting the electrical connector and removing the single bolt that holds it.

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I have fuel pressure but the engine wont start unless i spray starting fluid into the intake. the injectors arent working? could it be the pcm is bad?


Not likely. I believe the injectors have 12 volts going to them all the time. The PCM then grounds them so they operate when the crankshaft or camshaft sensor tell the PCM when the cylinder is on compression stroke.

I would check for an injector fuse first (see owner manual), and then check to see if you have a bad crank or camshaft sensor.

The PCM very rarely fails.

Section 03-14: Engine Controls, Electronic 1994 All Aerostar, Ranger, and Explorer Vehicles Workshop Manual
DESCRIPTION AND OPERATION Powertrain Control Module (PCM) The center of the EEC-IV system is a microprocessor called the powertrain control module . It receives data from various sensors:
  • Throttle position sensor (TP sensor) (9B989)
  • Mass airflow sensor (MAF sensor) (12B579)
  • Intake air temperature sensor (IAT sensor) (12A697)
  • Engine coolant temperature sensor (ECT sensor) (12A648)
  • Heated oxygen sensor (HO2S) (9F472)
  • Camshaft Position (CMP) Sensor
  • Crankshaft position sensor (CKP sensor) (6C351)
  • Power Steering Pressure (PSP) Switch
The powertrain control module contains specific calibrations for optimizing emissions controls, fuel economy, and driveability. Based on information received and programmed into its memory, the processor sends signals to control various actuators:
  • Fuel injector nozzle tip (9E527)
  • Ignition coil (12029)(s)
  • Idle air control valve (IAC valve) (9F715)
  • Ignition control module (ICM) (12A297)
  • EGR vacuum regulator control (9J459)
  • EGR external pressure valve (9F483)

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1 Answer

1999 Olds Alero 3400 motor -- location of Crankshaft sensor


Welcome to fixya. If you need anything else go to www.collisionrepairadvice.com here is the location.
On the lower rear of the engine (LA1) for the 7x
and for the 24x

On the lower rear of the engine (LA1

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1 Answer

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check coolant first .if all good .hot wire the fan make sure the electric fan motor is operating.if runs when hot wire.replace the relay and coolant temperature sensor.if fan dont run.when hot wire.replace the fan motor.

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