2003 Ford Expedition Engine shuts off

Tiny
DANDY1009
  • MEMBER
  • 2003 FORD EXPEDITION
  • 5.4L
  • V8
  • RWD
  • AUTOMATIC
  • 180,000 MILES
While driving and either stopping or accelerating the engine stops most particularly when the air conditioning is on.
Do you
have the same problem?
Yes
No
Wednesday, August 27th, 2014 AT 10:29 AM

3 Replies

Tiny
WRENCHTECH
  • EXPERT
Does it immediately start back up?
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Wednesday, August 27th, 2014 AT 10:37 AM
Tiny
DANDY1009
  • MEMBER
No it does not, it waits for few minutes. Then starts well.
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Wednesday, August 27th, 2014 AT 10:47 AM
Tiny
WRENCHTECH
  • EXPERT
That's good, you will have a short window to test.

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.

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, August 27th, 2014 AT 11:30 AM

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