5.4 Spark plug removal issue. Haven't seen this one
#21
Senior Member
Thread Starter
#22
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connorfx4 (08-19-2016)
#25
#26
05 5.4l 3v s.crew lariat
Hi voltage coils hard to test
I worked in Utilities on transformers up to 750 kv and a resistance check is okay but far from a good one .
Turn to turn shorts are very difficult to deal with and testing at some lower voltage is iffy being the charging draw is high . Basically we did a watts loss test that gave us an idea of the state of the insulators . I had the protection end of the job to detect problems when energized at full volts it had to come out of there within cycles if bad .
I would love to know exactly what is failing on these bad cops . Are they burning open with the load or shorting out internally ,do they have internal protection ?. An open can be found with a meter unless its intermittent . I only had one bad one and I tossed it .
I guess we could build an electronic tester but you have to be careful with 50kv output .
Maybe someone here has done some testing and cut some open .
Turn to turn shorts are very difficult to deal with and testing at some lower voltage is iffy being the charging draw is high . Basically we did a watts loss test that gave us an idea of the state of the insulators . I had the protection end of the job to detect problems when energized at full volts it had to come out of there within cycles if bad .
I would love to know exactly what is failing on these bad cops . Are they burning open with the load or shorting out internally ,do they have internal protection ?. An open can be found with a meter unless its intermittent . I only had one bad one and I tossed it .
I guess we could build an electronic tester but you have to be careful with 50kv output .
Maybe someone here has done some testing and cut some open .
#28
Senior Member
Thread Starter
Just a small update, my check engine light went out, truck has been running great. My avg liter per 100 has dropped from 18.6 to 17.4. Everything seems well...for now.