2002 Mercruiser 5 liter MPI cold start issue

joedm2000

Seaman Apprentice
Joined
Jun 21, 2020
Messages
38
I have a cold start issue. This started two weeks ago. When I turn the key and start cranking the motor, it gives no signs of starting even after cranking the motor for 10-15 seconds. If I release the key from the cranking position to the run position it starts. As long as the key is in the cranking position, it wont start when cold ( motor turns over, but no indication of firing up until the key is released to the run position).

After the first start of the day, it starts normally (holding the key in the crank position for a couple of seconds motor fires and I release the key and all is good).
 

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
42,064
First guess is needs a new key switch, but lets investigate
What is the motor serial number?
 

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
42,064
Thanks 555 ECM
Place a voltmeter on pin D of the DLC connector. With Key turned ON there should be 12V. The 12V should stay there when cranking
 
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