Hard starting...

[Evan_m]

My truck didnt want to start yesterday. I havent had any problems with it untill just now, it would turn over and puff smoke but wouldnt start. The wait to start light comes on, and my fuel isnt gelled. It does however fire right off when it has been plugged in. My instinct is that the glow plugs went out on it, but i know there is a relay in there too. Wondering what you guys think it might be, where the relay is located, where the glow plugs are, and the best way to get them out and check them.
2002 7.3 PSD all stock, hypertech programmer on number 2

[vitalidle]

Evan what are your outside temps getting down too at night?

[Tony V]

Yeah some trucks dont like to start when it gets cold when they are not plugged in.

[Evan_m]

it was around 6 out yesterday
it has been colder then that lately and it has started just fine, that is the weird part...

[vitalidle]

Probobly your relay. Here is a link to help you out on testing the relay and glow plugs. Troubleshooting GPR & GP's

[Evan_m]

oh ya i forgot that after lots of spinning over it finally did start

[Tony V]

Yeah check your glow plugs and relay.

[NCHornet]

GP's won't go out all at once, check your entire GP system per the above link and you should find the problem.

[Diesel Monkey]

Also, what oil are you using? 15w40 is great for most of the year except when it gets in the teens or lower.

Those glowplugs don't last more than about three or four years.

[chachl3835]

GP relay................mine was doing the same, I did an oil change, fuel filter and air filter change and replaced the GP relay and wola.......fired right up there are 2 relays on top replace the back relay that is the relay to the GP.