Hello, does anyone know how to check a coil on plug coil. On a V-10 a cylinder balance test doesn't produce much of a change. I was told by the mfg of my obd tester that they do not accurately read 2000 model year motor home computers.
2000 6.8 in Motor Home Chassis
Thanks

 

If you can get the spec on the coil. A good multi-meter that reads inductance (a.k.a. milli-henny) might show you a bad coil. Although somtimes coils only fail under load; its the catch 22.

 

What are the symptoms that you are exhibiting, maybe we can help you diagnose the problem?

 

Really no symptoms, I am replacing the plugs and thought if there was a way to check the coils with a multi-meter I would do it.

if I may hijack my own thread, has anyone run into coolant in the spark plug holes. I assume it is porosity seepage, I have 40K on the engine and never added coolant. I think in years past Ford had some issues(may have been in auto trannys) with thios type of leakage.

Thanks for the replies, great site.

 

Give this thread a read. https://www.ford-trucks.com/forums/4...-o-p-test.html

 

The coolant in the plug-hole thing might be a leaky heater hose connection. Is it #4 ro 5? There were trucks with the problem, but usually in the 5.4 in the F150. But anything can happen after 7-8 years

The trick with bad COPs is that they usually only fail when hot - so, you'd have to heat them up to 180-200 degrees and then see if they exhibit any problems.

If you do wind up having a bad one eventually, buy one brand-new one and round-robin it onto each spark plug - that's one way to find a bad COP when you can't read the computer's misfire counters.