Bare with me. IM a blinker fluid kind of girl.

Tiny
MRSDIXON
  • MEMBER
  • 1994 TOYOTA 4RUNNER
  • 3.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 170,000 MILES
My husband is trying to fix it for a friend he has tried everything he can think of but no luck. Here is what I know he has replaced the relays and all the parts in the computer but still cant get it to spark. Thought it would be funny if I came up w the answer before him ;) would also like him out of the garage! Anything else he can try. Any help would really be appreciated!
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Friday, January 24th, 2014 AT 7:58 PM

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Tiny
WRENCHTECH
  • EXPERT
I assume this means you have a "crank, no start" situation.

There is some more testing that has to be done.

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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Saturday, January 25th, 2014 AT 6:42 AM

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