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2001 Chevy Impala random stalling


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choff79
New User

Jan 13, 2016, 7:26 AM

Post #1 of 3 (885 views)
2001 Chevy Impala random stalling Sign In

2001 Chevy Impala
155k Miles

5 months ago my impala randomly stalled out while driving about 60MPH. Battery light came on and I lost power steering and acceleration. I turned the car off and back on and it started right up and was fine. This happened again about 3 months later and after that it began happening frequently and randomly. I could be driving 55mph or just accelerating after being stopped at a stoplight. I have had it looked at by two different people and no codes show up when hooked up the the computer and nothing appears to be wrong. Last stall out was on 12/24/15. A data reader was placed in the car which monitors 24 hours of data at a time, but never showed anything abnormal. A few days later, I began having issues with it not starting back up. For example, in the morning I got in my car and drove 15 miles to a store, shopped for about 30 minutes, came back out and my car wouldn't start. It would crank but would not start up. After about 30 minutes of trying while waiting for a ride, it starts up and runs fine back home. My mechanic gave me a loaner and has been driving my car around quite a bit so he can have these issues happen to him. Of course it's been almost 2 weeks and there has been no issue despite putting quite a few miles on it. A new battery was put in about 2 weeks ago, originally they thought it was the mass airflow sensor but the car stalled with and without that being plugged in. They were thinking maybe the crank shaft but again, the car has ran fine while they have had it so they can't find any issues. Any thoughts? I have a 50 mile trip each way 3-4 times per week so I need a reliable vehicle.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 13, 2016, 7:51 AM

Post #2 of 3 (878 views)
Re: 2001 Chevy Impala random stalling Sign In

Of course you lose power steering and battery light comes on when an engine stalls so that means nothing.
Code readings should show what went wrong or dropped out to cause a stall then an all crank no start. If not you need a better code read.
In replacing the battery unless a memory saver was used all stored data was erased. OK so a tech is driving the car hoping for it to happen and catch it which may find it.
If nothing can show with code readings in some time my guess is a lousy connection of many possible that can drop out spark. Which will remain a guess unless it stays NOT running or starting while checking,
T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 13, 2016, 9:41 AM

Post #3 of 3 (863 views)
Re: 2001 Chevy Impala random stalling Sign In

The computer isn't necessarily going to set a code when it dies. It doesn't monitor everything.

If this thing actually went as far as not starting, then that is your opportunity and probably your only one to be able to diagnose what is failing.

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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