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-   -   MSD - No spark while engine is hot (http://www.clubcobra.com/forums/ignition/133097-msd-no-spark-while-engine-hot.html)

datsun280z 04-29-2015 02:59 AM
MSD - No spark while engine is hot
 
:confused:

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

Gaz64 04-29-2015 03:11 AM
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?

Tommy 04-29-2015 04:10 AM
Datsun280Z,
What you described is the exact symptom of my failed MSD 6AL. I sent it back and they fixed it for a fee.

JLip 04-30-2015 01:23 AM
Sorry to say....I took out the MSD box and my car runs MUCH better.

Ron61 04-30-2015 03:12 AM
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 :(

lovehamr 04-30-2015 05:11 AM
Ron, what ignition are you using now?

Chachi427 04-30-2015 06:29 AM
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.

zrayr 05-01-2015 10:46 PM
Quote:
Originally Posted by Chachi427 (Post 1346867)
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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