HELP! I've got a 94 F-350 With a 7.3 idi turbo with 250,000 mi.runs good but tough to start in cold weather, and GP didn't cycle very long so i went to the diesel stop .com and someone sugested to to put a switch on GP controler Worked fine for a while until one cold buffalo morning hit the switch maybe once too many times truck started but next morning.when key was turned on, wait to start light went on for long time but no cycling and truck didn,t start,with new controler same contition.did I burn out fuseable link and where are they?or screw up glow plug harness?Any info would be appriciated

Bflodiesel

 

Chances are that you burned up a few glow plugs( if not more) Check them out first before going any farther. My .02 cents

 

You must have some faulty glow plugs. When I got mine about a month ago the wait to start light only stayed on for a few seconds and was hard starting. I replaced the complete set of glow plugs and now the wait to start light stays on about 15 or 20 seconds and she starts great. Don't forget to give half throttle over 32 deg and full if under 32 degrees.

 

Thanks Guys
Your help was GREAT!!! when tested all the glow plugs were bad.i even figured out how to get the GP out under The Turbo .Cut A deep 1/4 inch drive 3/8 socket in half with a unverisal and 6" extension got it out real quickWith 8 new Motorcraft GP light stays on for about 9 sec. truck starts right up

 

well i know that you should keep your glow plugs on a lot more than reomended this is what you should do.
50-100 degrees- 30-40 seonds.
50-0 degrees 2 minutes
0- -20 - go in after you turn on the glow plugs and get a of offe then start it.

 

The glow plugs won't stay on for 2 minutes. If they did they would burn out, they aren't built for that. Mine starts pretty good under normal operation down to -20 celcius. Just remember to use half the peddle for 0 or above and full pedal for 0 or below.