Question about 1995 Oldsmobile Aurora

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Car will run sometimes then at other time it will not crank. I have replace computer, ignition module, fuel pressure regulator, and fuel pump. Do you have any suggestions.

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  • rick
    rick Feb 22, 2012

    when you say it will not crank , do you mean that the engine will not even turn over ?

  • Jimmy Massey Feb 22, 2012

    engine will turn just will not run

  • Jimmy Massey Feb 22, 2012

    engine will turn over

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 883 Answers

SOURCE: fuel pump has very little pressure

change the fuel filter

Posted on Jun 09, 2008

godspeed808
  • 125 Answers

SOURCE: olds alero 2.4 idle fuel pressure

most likely idle air control sensor or low engine coolant I know sounds funny but IAC uses coolant to regulate idle. Idle air control valve or throttle body positioning sensor.

Posted on Feb 26, 2009

emissionwiz
  • 75822 Answers

SOURCE: ignition module

the ignition module provides a signal to the coil at the proper time to fire the spark plugs and ignite the fuel in the cylinders. Have u had this system tested for trouble codes? when exactly does it stall?

Posted on Mar 22, 2009

  • 3 Answers

SOURCE: quits while driving replaced many suspected parts

try this, the next time it quits leave the key in on position and get a broom stick and go to the passenger side of the car. About straight in at the back of the door ,reach under with the broom stick and tap the plastic gas tank a few times, have someone try to start it or go start it yourself. Mine did this even after the garage checked it out and cleaned the tank. Come to find out dirt settles around the fuel pump and clogs it. They just blame the pump but in my case the pump was fine. I was told Alero used a very small fine mesh in the sock that goes in the fuel pump and they clog up. But most of the dirt was around the plastic guard around the fuel pump. See if this works and let us know. Good luck

Posted on Apr 07, 2009

MNfisherman
  • 11896 Answers

SOURCE: 2003 Olds Alero Will turn over but not start

Hard to determine without a diagnostics test. Since you replaced modulator and fuel pump and have same probelms, I was wondering:
Does it not fire or not turn over at all?

If you are not getting power to fuel pump at all times, that it may be a fualty Computer which can be about $400 to repair. VERY COMMON PROBLEM WITH GMs.

Do you have any engine codes? Or is your check engine light on?

Have you checked all your relays? This is the first thing I would do. You can check them with a digital ohmmeter or voltmeter.

Posted on May 13, 2009

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Takes a long time for fuel pump to prime before car will crank. sometimes 15+ minutes


Something is definitely wrong with this picture. It should only take 2 or 3 seconds for the pump to make correct pressure. Just turning the key to on turns the pump on to pressurize the system, then pump will shut off, maintaining pressure, until the computer gets an engine cranking signal, at which time pump should come back on, and stay running when engine is running.
The only way to check fuel pressure is with a fuel pressure gauge hooked onto the fuel rail. If you check and pressure is correct and doesn't drop right away, the problem is elsewhere, not in the fuel delivery. You said takes a long time before car will crank-is there a problem with the engine cranking over with key in start? That would be an ignition or starting circuit problem, not having anything to do with the fuel pressure.

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Have a 1998 chevy silverado k2500 7.4L. first time u start it that day it starts fine. any other time that day it cranks and cranks, i stop an try again it turns over, bogs down then idles up and runs...


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WARNING! I'm sometimes accused of not giving short answers. However, my philosophy is that too much is better than too little.

Still with me?

This is how your problem is researched in my shop. Out of the box, I'd say that you have a problem with the fuel management system. However, there's a good chance that it's something simple and inexpensive like a clogged fuel pressure regulator or water in the fuel tank.

My second area of concern would be the manifold pressure sensor which is located under the hood, center, rear engine area, above valve cover, mounted in bracket. However, you must remember that these are nothing more than starting points and not guaranteed solutions at this preliminary stage.

First a little background for your edification. You may be aware of all this but we've never done business before and all assumptions are off the table.

For an engine - make that any engine and irrespective of manufacturer - to run, you need three things to happen inside the engine, compression, fuel and ignition, without any one of these components the engine will not run.

• Compression - Engine compression caused by crankshaft rotation and pistons moving up and down inside the engine block. If the timing belt or timing chain fails it will cause the camshaft to become out of correlation with the crankshaft or allow the camshaft to stop rotating. Either of these conditions will cause the engine to lose compression and sometimes cause internal engine damage.
• Fuel Delivery System - The fuel system includes: fuel pump, fuel injectors, pressure regulator, fuel filter and pressure lines. This system is used to supply fuel under pressure to the fuel injection system, the lack of fuel pressure or volume will cause the fuel delivery system to fail and the engine to stall or not start. The fuel pressure regulator has screen that can be removed with a small pick if it is dirty and appears to be clogged. Removing the screen will not affect the operation of the regulator.
• Ignition Spark Delivery System - The ignition system components include: spark plugs, spark plug wires, distributor (if applicable), crankshaft angle sensor, camshaft angle sensor, ignition coil, ignition module, knock sensor and PCM (powertrain control module). The engine relies on the ignition spark to be delivered to the combustion camber at the correct time. If the ignition spark stops or is delivered at the wrong time the engine will not run or run poorly.


Whenever your engine cranks but does not start, runs rough, staggers, sags or cuts off, follow this Troubleshooting Guide. Some of these steps require a code scanner. They are costly but AutoZone will loan you one for FREE.

Most vehicles operate by the same principle; basic troubleshooting procedures apply to most cars.

• Step 1: Anytime you have a problem with electronically controlled components such as an engine, transmission, ABS brake, or SRS (supplemental restraint system, Air Bag) inspect all fuses using a test light and check the under hood power distribution center and under dash fuse panels. If all fuses test okay continue to the next step.
• Step 2: To check for problems with electronically controlled components such as an engine, transmission, ABS brake, or SRS (supplemental restraint system, Air Bag) and the fuses test okay a trouble code scan - borrowed from AutoZone - is needed to identify any system trouble. Use this easy-to-use simple scanner tool to retrieve trouble codes and see if they relate to the specific problem, like a crank angle sensor failure code. If the trouble code present does not pertain to the immediate problem like an EVAP code ignore it until a later time, after the car is running.


NOTE: Scan the system again after the vehicle is running. The reason is that non-related codes can be detected after the engine is running because sometimes false codes can be triggered by the engine not running. Once the engine is running again the code present might cycle and turn itself off. You might say "if the engine doesn't run shouldn't it have a trouble code?" Sometimes conditions occur that will not be detected by the computer, example: if the fuel pump fails the computer cannot detect the failure, so the engine doesn't start and the computer thinks everything is okay with no codes. If no trouble codes are present proceed to the next step.

If you have trouble using the code scanner or interpreting the codes click on the following link and use my access code (carrepair): Free Automotive Repair information for Users of a Code Scanner

All the best

Ben

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If it runs on start fluid and nothing else its obviously a fuel concern fuel pump ,fuel pump relay ,check fuel pressure at the regulator that you replaced.

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