1988 Ford Ranger Starting

Tiny
BILLHELTON
  • MEMBER
  • 1988 FORD RANGER
  • 6 CYL
  • 4WD
  • MANUAL
  • 86,000 MILES
The 2.9 V-6 iin my ranger starts but stops as soon as I let the Key back from start to run. What can I check and how can I check it. I have a Multi meter and have work on cars for many years.
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Wednesday, November 10th, 2010 AT 2:35 PM

3 Replies

Tiny
WRENCHTECH
  • EXPERT
I'm going to give you a testing sequence but your going to have to simulate the problem so I would suggest leaving the key in the "on" position and jumping the starter solenoid for testing purposes.

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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Wednesday, November 10th, 2010 AT 3:02 PM
Tiny
RASMATAZ
  • MEMBER
Hi billhelton, Welcome to 2carpros and TY for the donation

Start by testing the ignition switch, sounds as though the primary circuit of the ignition system is open from the ignition switch

Or do this power the coil positive terminal from the battery positive post and see what happens-let me know
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Wednesday, November 10th, 2010 AT 3:04 PM
Tiny
BILLHELTON
  • MEMBER
With the key in the on or run position there is 12 volts on the red wire at the coil. I rented an engine analyzer and it said not contact with the Micro processor. I replaced the Micro processor and same trouble. IF I keep the key in the start position the engine will continue to run until you let it go back to the run position. I also replace the relays on the inside fender that energize when the key is turned on. But I have to admit I pick up the relays at a wrecking yard.
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Friday, November 12th, 2010 AT 9:14 PM

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