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  #1 (permalink)  
Old 04-29-2015, 02:59 AM
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Default MSD - No spark while engine is hot



Hello
Strange problem... while engine is cold it start's right up.. on
first etempt..
When engine is shut down ( after 15 or more minutes ) and i want
to start it it won't start..
I checked and saw that no current comes to the distributor...
MSD 6
Is the Ignition box defective ?
Can it be something with the wiring harness ?
Thx
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Old 04-29-2015, 03:11 AM
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Do you know how to test the system for spark, engine not running?

What wire do you trigger with? White only (points), or green and purple (mag pickup)?

A common problem is the magnetic pickup going open circuit when hot.

What engine? What distributor?
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Old 04-29-2015, 04:10 AM
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Datsun280Z,
What you described is the exact symptom of my failed MSD 6AL. I sent it back and they fixed it for a fee.
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Old 04-30-2015, 01:23 AM
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Sorry to say....I took out the MSD box and my car runs MUCH better.
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Old 04-30-2015, 03:12 AM
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Jlip,

I had a very similar thing happen to one of my cars. After it got hot it was hard to start and just ran really bad. I disconnected the MSD unit and I hadn't gone 50 feet before I cold tell the difference. I think the heat caused a failure in mine as I never bothered to contact them to see if they would replace it. I went to another brand and have been much happier with it. I think MSD quality has gone way down in the past few years.

Ron
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Old 04-30-2015, 05:11 AM
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Ron, what ignition are you using now?
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Old 04-30-2015, 06:29 AM
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I had the same issue and it was my magnetic pick up. Check the continuity across the pick up when warm and cold. If it reads greater than 1K ohms then I would first replace that. Only about a $40 fix.
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Old 05-01-2015, 10:46 PM
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Quote:
Originally Posted by Chachi427 View Post
I had the same issue and it was my magnetic pick up. Check the continuity across the pick up when warm and cold. If it reads greater than 1K ohms then I would first replace that. Only about a $40 fix.
the pick-up will read differently (more resistance) when hot. but the critical reading is less than !,000 ohms I believe. Check with MSD on that. Also. it does help to have the box in a "breezy" area if located under the hood. I like to put them under the dash when possible.

Z
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