1992 Ford f-Super Duty. The truck turns over a lot before it cranks. Once it cranks it runs fine and can be cranked easily if you turn it off and try to crank it again. I found the glow plug relay cracked and replaced it. The problem still exists. Would I need to replace the glow pjugs next

I would ask or move this to the ford forum.
More knowledge on the corn binders.

Get a multimeter and test each of your glowplugs......You're info doesn't say where you're from, but my guess is the colder weather has brought this on?

nothing wrong with the info on this site but it is primarily a dmax site so i am suggesting that you try thedieselstop.com, i think you will have better results there bc it is a ford site.

Good luck, Luke

Check the glowplugs first, then check the actual wiring to them, they ahve a bad problem with rotting the connectors real bad and not making good connection to the plugs. Also check supply pump, sometimes helps to add a check valve on the rubber hose feeding the supply pump. Could also be ESO solenoid inside pump topcover hanging a little.

1992 Ford f-Super Duty. The truck turns over a lot before it cranks. Once it cranks it runs fine and can be cranked easily if you turn it off and try to crank it again. I found the glow plug relay cracked and replaced it. The problem still exists. Would I need to replace the glow pjugs next
I had a 92 with the same problem. I checked the glow plugs with a test light(didn't have a multimeter). Hook the test light to the positive side of the battery and disconect each plug and connect the test light. If it lights up the plug is still good. If it doesn't or you get a dim light the plug is bad or on it's way out.

A '92 has had several up-and-down operations of the pistons, and as always, blow-by and lack of initial compression can be a factor. That is,of course, until the compression and oil control rings have been sufficiently bathed in crancase oil thus allowing greater compression and ignition. Next time glow-plugs are replaced maybe do a quickie compression test just to put mind at rest. :rolleyes: