Intermittent No-Crank with PKF-3?

I recently installed a remote start in a 2005 Grand Marquis, and have experienced an intermittent "no-crank" problem.  My connections are all soldered, and I am pretty confident that the problem is not in the installation, though of course that is a possibility.  I have replaced the remote start unit with a known good unit, and now suspect either the PKF-3 from Trilogix, or possibly a bad relay.  My question is: has anyone experienced problems with this bypass unit? 

Thanks for any assistance,

Michael

Of course, when I check it out, the unit works.  (It's on my Mom's car).  According to her, it works less than 50% of the time.  I need to also check for "operator error" as a possible cause. LOL!   I am on my way to check it out; I'm beginning to suspect a problem with the wiring - maybe a loose connector.  Even though everything's soldered, there could be a flaky relay or relay socket.  Should be a fun afternoon!  If nothing else, at least my mom will feed me!  I'll post my findings after I (hopefully) fix the problem...I will also try remote starting with the key in as you suggested, David.  Thanks.

You are so right!  Even though I don't install full-time, it's always the family members which cause the biggest headaches.  I have been installing alarms, remote starters & other stuff in my own vehicles as well as for friends & family for about 20 years.  I also had a summer job during college at a shop in Queens, NY.  But the remote start in my brother's Lexus RX300 was the absolute worst!

Well, here's what I did:

1. Re-programmed the PKF-3

2. Removed a relay which was connected to IGN1 and providing "Ground out when running" to the PKF-3,  and connected a dedicated "Ground out when running" to the PKF-3 (I wasn't aware that the starter I was using had a dedicated "ground out when running" because the manual incorrectly identified the wire as a 1-second pulse only.)

3. Checked every wire & connection to verify that the install was solid.

4. Crossed my fingers!

So far, so good.