WHAT ELSE CAN I CHECK TO GET THIS CAR RUNNING AGAIN

  • Tiny
  • Lost
  • 1992 Mitsubishi Expo
  • 180,000 miles

1992 Mitsubishi Expo will not start after replacing fuel pump

Thursday, September 8th, 2011 AT 1:07 PM

15 Answers

  • Tiny
  • Wrenchtech
  • Expert
  • 19,818 posts

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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Thursday, September 8th, 2011 AT 1:26 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Did you check the fuel pressure at the fuel rail?
Did you confirm the fuel pump is working when ignition is turned on or while cranking?

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Thursday, September 8th, 2011 AT 1:31 PM
  • Tiny
  • Lost
  • Member

I have spark but no injector pulse

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Thursday, September 8th, 2011 AT 1:45 PM
  • Tiny
  • Wrenchtech
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  • 19,818 posts

Check to see if it is the power supply side or the pulsing ground side that you lost.
What is the fuel pressure.

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Thursday, September 8th, 2011 AT 2:00 PM
  • Tiny
  • Lost
  • Member

STAND BY-CHECKING

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Thursday, September 8th, 2011 AT 2:15 PM
  • Tiny
  • Lost
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OK IT IS THE GROUND SIDE

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Thursday, September 8th, 2011 AT 2:21 PM
  • Tiny
  • Wrenchtech
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  • 19,818 posts

Does your check engine light come on for bulb check when the key is turned on?
Are you positive that you have spark?

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Thursday, September 8th, 2011 AT 2:24 PM
  • Tiny
  • Lost
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IT COMES ON WHEN STARTING. IT USED TO GO OFF WHEN IT STARTED. CHECKING AGAIN FOR SPARK. STANDY BY

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Thursday, September 8th, 2011 AT 2:27 PM
  • Tiny
  • Lost
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OK THERE WAS SPARK

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Thursday, September 8th, 2011 AT 2:29 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,818 posts

Your symptoms are pointing to either a bad Engine Control module or Ignition control module. It will require some "in depth" testing to confirm either.

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Thursday, September 8th, 2011 AT 2:32 PM

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