Car quits

Tiny
JBDRUMS09
  • MEMBER
  • 2005 CHEVROLET IMPALA
  • 6 CYL
  • 2WD
  • AUTOMATIC
I have a 2005 Chevy Impala LS that quits randomly. This started about a year ago. When it quits it will **** suddenly, the check battery light comes on for a few seconds, then the power completely goes out. You can let it sit a few minutes then it will start again. It will go a little farther then quit again. It will do this at least 3 to 4 times then it won't start til it sits for a good while. It will turn over during these quitting spells, but won't crank. Could this be an air flow sensor.
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Tuesday, November 16th, 2010 AT 4:58 PM

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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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Tuesday, November 16th, 2010 AT 5:11 PM
Tiny
JBDRUMS09
  • MEMBER
The car quits randomly. When it does quit you can usually let it sit awhile then it starts back. When it quits it will **** suddenly then the power completely goes out. The check battery light comes on for a second. It might do this 2 or 3 times a day or it might not do it for 2 or 3 months. It seems like when the car is driven for a while and heat builds up it quits, but after it sits and cools it runs better. Could this be an air flow sensor going bad. I've already had the cam and crank sensors changed and it's obviously not them. I've heard of cars having the same problem and changing the air flow sensor worked.
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Tuesday, November 16th, 2010 AT 5:27 PM

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