New day, new problems
Moderator
Joined: Nov 2007
Posts: 22,415
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From: Denver Metro Area, CO
I don't remember everything that's going on here, but....
This, to me, is confusing...
"Nothing" to me means no cab power, no headlights, obviously no starter motor action.
But, then you clarify with "no spark from the coil" which you then want to blame the ignition switch just as a guess, this throws up red flags everywhere in my mind.
But, again, I don't remember everything that's going on here.....
"Nothing" to me means no cab power, no headlights, obviously no starter motor action.
But, then you clarify with "no spark from the coil" which you then want to blame the ignition switch just as a guess, this throws up red flags everywhere in my mind.
But, again, I don't remember everything that's going on here.....
Thread Starter
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Junior User
Joined: Mar 2012
Posts: 86
Likes: 0
From: Keavy, KY
Truck was having problems starting, ignition switch being tough to turn and sticking in the "start" position. A few people suggested my ignition switch may have been on its way out.
Sorry boss, I should have been clearer, by nothing, I meant it just cranks cranks cranks and no fire. Definitely getting fuel, but no spark from the coil. Literally, there is zero activity at the coil.
So being that the switch has already been suggested, I assumed it was that. May also be the coil, I suppose.
Sorry boss, I should have been clearer, by nothing, I meant it just cranks cranks cranks and no fire. Definitely getting fuel, but no spark from the coil. Literally, there is zero activity at the coil.
So being that the switch has already been suggested, I assumed it was that. May also be the coil, I suppose.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Could be a few things....
The pickup mechanism in the distributor instructs the module when to fire the coil.
The coil should get full battery voltage in START but half that in RUN, this is dictated by the presence of an inline ballast resistor.
Someplace out here there are some pretty decent images of the wiring schematic for this stuff, maybe Kevin or somebody knows offhand.
Anyhow... I would test for voltage at the coil in both START and RUN - two different circuits provide power during those two different times.
This is a great time to check your wiring in that general area, too.
Kevin likes his EVTMs........ Kevin?
The pickup mechanism in the distributor instructs the module when to fire the coil.
The coil should get full battery voltage in START but half that in RUN, this is dictated by the presence of an inline ballast resistor.
Someplace out here there are some pretty decent images of the wiring schematic for this stuff, maybe Kevin or somebody knows offhand.
Anyhow... I would test for voltage at the coil in both START and RUN - two different circuits provide power during those two different times.
This is a great time to check your wiring in that general area, too.
Kevin likes his EVTMs........ Kevin?
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Could be a few things....
The pickup mechanism in the distributor instructs the module when to fire the coil.
The coil should get full battery voltage in START but half that in RUN, this is dictated by the presence of an inline ballast resistor.
Someplace out here there are some pretty decent images of the wiring schematic for this stuff, maybe Kevin or somebody knows offhand.
Anyhow... I would test for voltage at the coil in both START and RUN - two different circuits provide power during those two different times.
This is a great time to check your wiring in that general area, too.
Kevin likes his EVTMs........ Kevin?
The pickup mechanism in the distributor instructs the module when to fire the coil.
The coil should get full battery voltage in START but half that in RUN, this is dictated by the presence of an inline ballast resistor.
Someplace out here there are some pretty decent images of the wiring schematic for this stuff, maybe Kevin or somebody knows offhand.
Anyhow... I would test for voltage at the coil in both START and RUN - two different circuits provide power during those two different times.
This is a great time to check your wiring in that general area, too.
Kevin likes his EVTMs........ Kevin?
Thread Starter
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Junior User
Joined: Mar 2012
Posts: 86
Likes: 0
From: Keavy, KY
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FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
I'm doubting the switch would fail in both the Start and Run positions at the same time. I think you may have a problem in the wiring at a point common to both the Start and Run circuits.
Thread Starter
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Junior User
Joined: Mar 2012
Posts: 86
Likes: 0
From: Keavy, KY
I'm thinking the running position was working fine, considering after it started the idle was fine, never had any misses or any signs of lost spark, driving or idling.
It actually started and ran a few hours before the spark plug change. Idle was fine, throttle was fine. I was low on gas, so I shut it off, filled my gas can, came back, added the gas, then no start.
It actually started and ran a few hours before the spark plug change. Idle was fine, throttle was fine. I was low on gas, so I shut it off, filled my gas can, came back, added the gas, then no start.
Posting Guru
Joined: Jan 2012
Posts: 1,410
Likes: 1
From: Dallas, GA
This is the ingnition system out of the EVTM....Like Chris and Gary said, I would test the coil and module to make sure they are getting power in run. Coil could still be getting power but if module is not...no spark. Or the vicsa versa.
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Junior User
Joined: Mar 2012
Posts: 86
Likes: 0
From: Keavy, KY
Problem fixed!
And I feel like a moron. One of the plugs coming off the coil is broken and had wiggled its way to the point of zero contact, but still appearing connected.
Pushed it in, and it fired right up. No more cold start problem.
Thanks for all the suggestions, and for putting up with my dull mind haha.
And I feel like a moron. One of the plugs coming off the coil is broken and had wiggled its way to the point of zero contact, but still appearing connected.
Pushed it in, and it fired right up. No more cold start problem.
Thanks for all the suggestions, and for putting up with my dull mind haha.