COIL READINGS RESISTANCE CHECK (1 Viewer)

love2fly

Flying the Mountains of the NW
Joined
Sep 7, 2004
Messages
1,935
I just recently been trying to chase down why my spark plugs had fouled on a separate post.
https://forum.ih8mud.com/threads/two-questions-if-i-may-2f-engine.820934/
I went to check my coil to confirm that all was working well.
When checking (W/O resistor) full electronic ignition system from a 1980 2F.

Primary coil resistance I got a reading of 0.15 ohms compared to the book 2.6-4.0 ohms
Secondary read 12.90 ohms compared to 6.0-9.0 ohms


The Toyota factory book says REFERENCE ONLY. My other book says the same.
Is there a more positive number to use for this test or am I to believe this coil is in question.

Thanks

coil check.JPG


coil 1.jpg


coil 2.jpg


PA139714.jpg


10-14-20121-60 s.jpg
 

pbgbottle

Forum Lifer
Joined
Feb 8, 2004
Messages
5,056
Location
Cloverdale B.C. Canada
Coil looks good to me your reading are within spec for a
Internally resisted coil pic shows 12.9 K. Ohm secondary
And 1.5 ohm primary.

U must be using an internally resisted coil.
 
Joined
Feb 6, 2002
Messages
15,198
Location
OC, CA
A bad coil will cause the engine to fail to run. It won't cause fouled plugs. Bad coils are extremely rare. I have only seen one that failed and it had obviously spewed its oil out.

Do a compression check. That will provide useful insight into the cause of plug fouling.
 

love2fly

Flying the Mountains of the NW
Joined
Sep 7, 2004
Messages
1,935
Oh crap - I was reading the W/O resistor, you're right it has an internal resistor. I forgot that it is internal even being full electronic. I added a couple more photos of the unit.
Thanks for setting me back on course.
From other post-
Compression test completed - from front to rear
145 - 144 - 144 - 145 - 144 - 145 PSI
Engine not hot just warm
 
Joined
Sep 14, 2009
Messages
2,923
Location
North and South of Mason Dixon
Compression looks good. Coil looks good. No complaints about how it runs. One plug looks like it's fouling more than others.

It's an old truck. Change the plugs (a hotter plug wouldn't hurt) and go have a beer.
 
Joined
Oct 21, 2013
Messages
2,038
Location
Naples Florida
Valve seals will not affect your compression and bad ones will foul your plugs. If everything else is good I would replace your valve seals.
 

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