Ford F-150, When trying to start acts like it's.

  • 1998 FORD F-150
  • 120,000 MILES
Ford f150, When trying to start acts like it's not getting gas and won't turn completely over. Then after a few minutes starts like their was nothing ever wrong with it. It's done this 2 times now out of the blue no signs of anything wrong with it. It's not missing or anything like that it just happens all the sudden without notice. Scared to take it anywhere because I'm afraid it's going to leave me stranded somewhere. I really do appreciate your time. Graham
Tuesday, April 2nd, 2013 AT 10:31 PM

1 Reply

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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Tuesday, April 2nd, 2013 AT 10:36 PM

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