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Testing procedure and ohm reading for the distributorless coil

Tiny
HANDY-MAN
  • MEMBER
  • 1999 FORD EXPLORER
  • 150,000 MILES
A mechanic said that I had a dead cylinder!I would like to check it out and try to locate the problem my self if I could.I would like a schematic or photo. I have no shop test equipment to test codes. I have a ohm /volt meter. I had a similar problem with my ranger 2002. I used a ohm meter to test and found out that I needed a coil for it.I have a manual for it. Runs grate.
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Monday, November 21st, 2011 AT 8:22 PM

5 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Go to a Pep Boys, Autozone, or similar type store and rent or borrow a compression gauge. Check the compression on each of your cylinders. Compression should be a minimum of 100PSI and vary by no more than 10-15PSI from highest to lowest. If any readings are low, put a few drops of oil into the cylinder and repeat the test. If the compression comes up, you have bad rings, if not, a bad valve.

Pull the spark plugs one at a time and see if they are getting spark. Remove the plug wire and the plug. Put the plug back into the end of the plug boot. Using a plastic tool, hold the threads of the plug against a good ground and have someone crank the engine. You should see a good, strong spark. If not, remove the plug and insert a Phillips screwdriver in the boot and repeat the cranking process. Spark indicates a bad plug, no spark points to a bad wire.
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Monday, November 21st, 2011 AT 8:28 PM
Tiny
HANDY-MAN
  • MEMBER
  • 3 POSTS
Thank for the info on the leak down test. I believe thats what its called. Thanks again rivermikerat. I was wondering if you had the ohm readings and the procedure I was looking for.

Thanks, handy-man
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Tuesday, November 22nd, 2011 AT 9:09 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
A resistance measurement is not very reliable because of temperature changes drastically effect the test results and the way the component fails. Most of them don't fail until they get hot.
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Tuesday, November 22nd, 2011 AT 9:18 PM
Tiny
HANDY-MAN
  • MEMBER
  • 3 POSTS
Thanks, It looks like I'll need to buy a manual.

Handy-man out!
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Sunday, November 27th, 2011 AT 6:59 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Let us know what you find out.
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Sunday, November 27th, 2011 AT 7:16 AM

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