2000 Oldsmobile Alero cranks but wont start

Tiny
JMN0128
  • MEMBER
  • 2000 OLDSMOBILE ALERO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
Drove my car one day it was fine, got in it the next day wont start, searched on internet found that the theft deterant might have to be reprogrammed, very usual on these cars so I followed the directions and it started right up, drove for three days and now again it wont start, I tried the 10 min program security thing again and this time it wont start. We checked the fuel its at 40 psi, checked spark no problem, we have fuel in the car so its not that, I have no codes showing up when we ran a diagnostics, pass the emissions but at first it said evan system small leak, changed the gas cap and now thats fine but this car still wont start, what could be the problem, im clueless
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Wednesday, September 15th, 2010 AT 8:48 AM

9 Replies

Tiny
WRENCHTECH
  • EXPERT
Do you have a security light on or flashing when this happens?
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Wednesday, September 15th, 2010 AT 9:08 AM
Tiny
JMN0128
  • MEMBER
No security light, pass emissions, no codes, got spark and fuel in vehicle. Could it be my fuel filter and which one?

Which filter would make the car not start the inline fuel filter or the one in the pump
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Wednesday, September 15th, 2010 AT 12:46 PM
Tiny
WRENCHTECH
  • EXPERT
All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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Wednesday, September 15th, 2010 AT 12:51 PM
Tiny
JMN0128
  • MEMBER
We sprayed some carb fluid in throttle body and it started right up what does this mean
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Wednesday, September 15th, 2010 AT 2:52 PM
Tiny
WRENCHTECH
  • EXPERT
That means it's a fuel issue and the ignition is good. That still doesn't tell you if it's a fuel pump problem or inoperative injectors but odds are with the fuel pump. You still need to determine if it's a bad pump or a power supply problem.
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Wednesday, September 15th, 2010 AT 3:27 PM
Tiny
JMN0128
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We can here the fuel pump working fine, couldit be the fuel filter?
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Wednesday, September 15th, 2010 AT 5:17 PM
Tiny
WRENCHTECH
  • EXPERT
It doesn't matter if you can hear it. You need to read the pressure and test the injector pulse.
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Wednesday, September 15th, 2010 AT 5:24 PM
Tiny
JMN0128
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Fuel Injection Pressure there is no pressure what does this mean and how do you test the fuel pump
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Wednesday, September 15th, 2010 AT 6:43 PM
Tiny
WRENCHTECH
  • EXPERT
If you can hear the pump running and there is still no pressure, then you are either out of fuel or the pump is bad. Try pinching off the return to double check the pressure.
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Wednesday, September 15th, 2010 AT 6:45 PM

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