ignition stumble
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Lead Driver
Joined: Mar 2008
Posts: 7,193
Likes: 387
From: Near Los Angeles
ignition stumble
Hello everyone. This is my first post in this forum. I have an issue with my MSD 6a box and fan. The msd is wired directly to the battery positive, as directions state. The dual fan system is wired through relays, one to each fan, triggered by an adjustable in cooling fins type thermo switch. The positive for the fans is off the solenoid.
When the fans kick in, the idle falters for a second, as though sucking juice from the msd. How can I resolve this issue. Any ideas. And thanks for taking your time to answer.
kevin.
When the fans kick in, the idle falters for a second, as though sucking juice from the msd. How can I resolve this issue. Any ideas. And thanks for taking your time to answer.
kevin.
Moderator
Joined: Jan 2001
Posts: 57,012
Likes: 2,750
From: Virginia
I would consider the grounds. We just had a post a couple of weeks ago where a poster had a MSD problem, and it turned out to be the ground to the box itself. He was using the isolation mounts, and was not getting a good ground to the box. He ran a ground wire from the box itself to the battery negative and his weak spark problems went away.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
You asked this exact same question in the 73-79 forum a couple weeks ago. I took the time to give you a pretty detailed response, which you seem to be ignoring. What's the deal?
https://www.ford-trucks.com/forums/1...d-stumble.html
https://www.ford-trucks.com/forums/1...d-stumble.html
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