SPONSORED LINKS

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.
SPONSORED LINKS
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.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
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
Was this
answer
helpful?
Yes
No
Tuesday, November 22nd, 2011 AT 9:09 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 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.
Was this
answer
helpful?
Yes
No
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!
Was this
answer
helpful?
Yes
No
Sunday, November 27th, 2011 AT 6:59 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Let us know what you find out.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, November 27th, 2011 AT 7:16 AM

Please login or register to post a reply.

Related Ignition Coil Test Content

Ignition Coil System Test Repair - All Cars
VIDEO
Ignition Coil System Test Repair - All Cars
Instructional repair video
Ignition System Testing
GUIDE
Ignition System Testing
Step 1 - Identify the type of ignition system to be tested, most cars, use a coil over plug (COP) type of system, there are several variations but all work on the same...
VIEW MORE

Sponsored links