No spark when cold

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Dec 21, 2017 | 08:11 PM

#11

GeorgeLG

BF Veteran

Joined: Jan 2007

Posts: 4,625

From: Florida

When it is cold and cranks but no start. Do you have 1" of blue spark? Are your fuel pressures OK?

Try hitting the electronic elements with a heat gun or hair dryer, one at a time - ignition module, coil, ECM, etc

George

Dec 22, 2017 | 04:26 AM

#12

Mike.308

Senior Member

Joined: Nov 2017

Posts: 746

From: Poland

Quote:

Originally Posted by GeorgeLG

When it is cold and cranks but no start. Do you have 1" of blue spark? Are your fuel pressures OK?
Try hitting the electronic elements with a heat gun or hair dryer, one at a time - ignition module, coil, ECM, etc

I was about to as the same. How do You know, there is no spark? Your assumption, I guess...? Ignition system is a rather sturdy design and - if something fails on cold only, that would be the coil.

Have a look into another issue, pointed out by Oldeerslayer in another topic:

Quote:

Abraham Torres-Arredondo, the author of the series on Vortec trouble shooting: Yes, let me repeat that one more time: As crazy as this sounds... the fuel pump will deliver enough fuel to keep the engine running, but not enough to start it when you're cranking the engine.... and this makes a lot of folks think that the problem lies anywhere else but in the fuel pump!

You should tap with a pressure gauge to the fuel line and do the pressure check.