GP issue
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Freshman User
Joined: Oct 2007
Posts: 31
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GP issue
i have power at the gp relay
when i turn the ignition key on the relay clicks but no power to the gp
i took each glow plug out and tested it on a battery and they all were bad
none of them got hot but know i was testing them right cause there was a couple old ones in the truck that past that test (got hot fast)
they were autolites which i read were not good stuff but none of them looked burnt and all looked new
no swelling or anything
what would cause them to all be bad????
i just bought this truck so i dont know any history of it
i did order the motorcraft zd9 to put back in but have recieved them yet
but wondering if something else could be wrong before i put the new ones in
thanks
90 f250 7.3
when i turn the ignition key on the relay clicks but no power to the gp
i took each glow plug out and tested it on a battery and they all were bad
none of them got hot but know i was testing them right cause there was a couple old ones in the truck that past that test (got hot fast)
they were autolites which i read were not good stuff but none of them looked burnt and all looked new
no swelling or anything
what would cause them to all be bad????
i just bought this truck so i dont know any history of it
i did order the motorcraft zd9 to put back in but have recieved them yet
but wondering if something else could be wrong before i put the new ones in
thanks
90 f250 7.3
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
There have been people post in here that they only got 3 starts out of a set of Autolite glow plugs.
I think the fellow that had it the worst only got one start out of his set.
The 90 uses the new style glow plug system.
That system uses resistance feedback to time the glow plug cycle.
Two or three bad glow plugs make it cycle so fast that the glow plugs do not get hot.
With all of them bad, it won't even turn on.
I think the fellow that had it the worst only got one start out of his set.
The 90 uses the new style glow plug system.
That system uses resistance feedback to time the glow plug cycle.
Two or three bad glow plugs make it cycle so fast that the glow plugs do not get hot.
With all of them bad, it won't even turn on.
Last edited by Dave Sponaugle; Jan 8, 2008 at 08:45 PM.
5th Wheeling
Joined: Jul 2006
Posts: 31
Likes: 0
From: Tioga ND
I had the same problem ( it turned out) but I chased it for 3 weeks thinking it was a return line problem. I came home from work and the next mornig it wouldn't start. Cranked it over multiple times but no start. I thought it wasn't getting fuel so I pulled the fuel filter but it had plenty, but once I removed it every time I cranked it over I would recheck the filter and it would loose about half of the fuel. Bypassed the water seperator replaced the fuel pump still no start. I was about to pull the bed, all these trials I found on this forum, but I happened on Dave Spongale description of how to check the Glow plugs and how to bypass the relay. I found all 8 bad, I replaced them with ones for a 91 round top no blade and I put in a manual switch (from Dave Spongale descripiton) and Wow did she fire up. Been driving it for a week now with no other problems. Thanks Dave for the help. I did put in the autolite since they were in for 2 years prior to this and I never had any problems, My choice, I couldn't find the motorcraft for less than $30.00 here in AZ.
85 250 6.9l
85 250 6.9l
Thread Starter
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Freshman User
Joined: Oct 2007
Posts: 31
Likes: 0
gp issue
flathead
i listen to the guys on here
thats why i didnt put the autolites back in it
cause that little bit extra for them is worth a piece of mind
knowing they wont cause me to have to pull a head off
to get a broken off gp.
dont want to see you on here in the future asking how to get
a broken glow plug out
lol
thanks again guys
i listen to the guys on here
thats why i didnt put the autolites back in it
cause that little bit extra for them is worth a piece of mind
knowing they wont cause me to have to pull a head off
to get a broken off gp.
dont want to see you on here in the future asking how to get
a broken glow plug out
lol
thanks again guys
