Hard Start or No Start Cold

[makuloco2000]

Just had my first Cold no start diesel of the season and decided to share the diagnosis involved since others may soon be in the same boat. This one had a bad glow plug relay.

http://www.youtube.com/watch?v=rnd8ea-QJSg

 

[A/Ox4]

Very good! GPR is on the top of my list for these issues.

 

[makuloco2000]

Yeah I have had 2 come in the shop this season already and it's not even that cold here both needed them. One was a 1995 and the other was a 1996. I have never worked on so many of the older 7.3l, they usually take them to independent shops and I get buried in 6.0's.

 

[A/Ox4]

I could take my GPR and throw it away and I would probably be fine, so my no start diagnosis doesnt include the GPR. Its not cold enough here.

 

[makuloco2000]

I could take my GPR and throw it away and I would probably be fine, so my no start diagnosis doesnt include the GPR. Its not cold enough here.

I don't know, it was 60 degrees here when these 2 came through but at that temp after a few key cycles of 10 sec cranks and it fired but why put all that extra on your starter. It never gets to the 50's or 60's there? I remember a few days showing up for PT in the morning on Camp Pendleton it was in the 40's in SoCal.

 

[JLDickmon]

I don't know, it was 60 degrees here when these 2 came through but at that temp after a few key cycles of 10 sec cranks and it fired but why put all that extra on your starter. It never gets to the 50's or 60's there? I remember a few days showing up for PT in the morning on Camp Pendleton it was in the 40's in SoCal.

I agree. When the GPR fails on a 7.3, the engine WILL NOT START.

btw.. here's my thread on a similar issue..
http://www.superdutydiesel.com/forums/showthread.php?23955-Missing-no-power

 

[A/Ox4]

I don't know, it was 60 degrees here when these 2 came through but at that temp after a few key cycles of 10 sec cranks and it fired but why put all that extra on your starter. It never gets to the 50's or 60's there? I remember a few days showing up for PT in the morning on Camp Pendleton it was in the 40's in SoCal.

It gets to the 50s here regularly in the winter. Unless its sub-50 I usually dont even wait for my WTS light to turn off. I know, call me crazy, but it always fires right up.
If its REALLY cold, or I'm patient, I do wait for my glow plugs.

 

[makuloco2000]

Very interesting, well whatever works right.

 

[JLDickmon]

I had a GPR bite the bone one time.. in July... would belch up the biggest cloud of white smoke you ever saw, but it WOULD NOT fire..

 

[makuloco2000]

In july huh? Now that is interesting. You live in the northern climates?