Join Date: Nov 2006
Location: Columbus, Ohio
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I don't mean to sound like I'm repeating the other post I'm just trying to be clear on an anwser.
First, I wouldn't totally rule out you batteries until you have them load tested, I'm not one to jump at replacing batteries, it's just a good check the basics first.
Second, the smoke is indicating you are getting fuel and if you plug in the block heater and it starts your problem is in the glowplug operation.
Third, the "wait to start" light stays on long enough for the glowplug to get to operating temperature, however, after the light is off, the glowplugs are still powered by the relay for aprox. 2 minutes to assist with cold running operation.
I've been having the same problem as well, the other day I stop at one of the best shops in town and the tech told me "even though the test show the glowplugs to be OK (test light & resistance), changing the glowplugs has fixed a few of the truck they've had in their shop, even his own truck". He went on to say "the smoke indicates fuel & if the block heater helps it almost has to be the glowplugs".
Update on my truck, I changed the glowplugs and now it starts ! ! I had tested everything, batteries, glowplug relay, glowplugs (w/test light & resistance), and fuel pressure. Everything tested good ! ! ! I had the Motorcraft glowplugs (Beru) and I used Motorcraft as the replacements. I don't know why it all tested good and didn't start before, but it starts and runs properly when its cold now.
Hopefully you won't have as much work as I did, but if everything else checks out good on your truck, don't rule out the glowplugs