7.3L starting problems, glow plugs? - Diesel Forum - TheDieselStop.com
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Old 12-17-2005, 02:42 PM   #1 (permalink)
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7.3L starting problems, glow plugs?

New member here, I have a 1997 F-super duty with a 7.3L turbo, now that it is cold it wont start. When I turn the key to warm the glow plugs, the relay doesnt click, and there is no power going to the plugs. The relay was replaced less than a year ago. Any suggestions or adivce to help with the problem will help.


thanks
Steve
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Old 12-17-2005, 02:44 PM   #2 (permalink)
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Re: 7.3L starting problems, glow plugs?

I bet your relay is dead again. Mine didn't click when it died.
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Old 12-17-2005, 02:48 PM   #3 (permalink)
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Re: 7.3L starting problems, glow plugs?

Does the WTS light come on?
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Old 12-17-2005, 02:50 PM   #4 (permalink)
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Re: 7.3L starting problems, glow plugs?

Turn the key to the "ON" position, or have someone else do it. As soon as the key is turned take a volt meter to the two large lugs on the Glow plug relay. The reading should be VERY close to "0" if not "0". If you get a high reading...GPR is bad...

Good Luck
Casey
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Old 12-17-2005, 02:53 PM   #5 (permalink)
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Re: 7.3L starting problems, glow plugs?

to clarify for Casey, he means the voltage difference between the two posts should be very close to zero. For example if the power side going in is 12.5, then the side coming out to the plugs should be very close to 12.5. Start there, then ohm the plugs. Let us know if u need more help
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Old 12-17-2005, 02:55 PM   #6 (permalink)
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Re: 7.3L starting problems, glow plugs?

[ QUOTE ]
to clarify for Casey, he means the voltage difference between the two posts should be very close to zero. For example if the power side going in is 12.5, then the side coming out to the plugs should be very close to 12.5. Start there, then ohm the plugs. Let us know if u need more help

[/ QUOTE ]

thank you for clarifying...after reading my post, even I
was scratching my head a bit [img]/ubbthreads/images/graemlins/grin.gif[/img]

-Casey
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Old 12-17-2005, 03:01 PM   #7 (permalink)
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Re: 7.3L starting problems, glow plugs?

[ QUOTE ]
Does the WTS light come on?

[/ QUOTE ]

It comes on for a brief second then goes right out.
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Old 12-17-2005, 03:07 PM   #8 (permalink)
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Re: 7.3L starting problems, glow plugs?

That doesn't sound right unless its 60-70 degrees where your at. First do like the others said and check the voltage across the big terms and then check it at the little ones. Does it crank over fast? Does it smoke while cranking?
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Old 12-17-2005, 03:43 PM   #9 (permalink)
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Re: 7.3L starting problems, glow plugs?

[ QUOTE ]
That doesn't sound right unless its 60-70 degrees where your at. First do like the others said and check the voltage across the big terms and then check it at the little ones. Does it crank over fast? Does it smoke while cranking?

[/ QUOTE ]

It cranks over like it normally would if it would start, and after a few rounds of heating (or the period of when it should heat) then cranking and eventually get smoke.
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Old 12-17-2005, 06:24 PM   #10 (permalink)
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Re: 7.3L starting problems, glow plugs?

Do the "i gotta go method"
Turn the key on, take a screw driver and short across the 2 big terms and count about 45 seconds, then run around and try to start it. if it fires up it's probably your GPR.
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Old 12-18-2005, 12:11 AM   #11 (permalink)
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Re: 7.3L starting problems, glow plugs?

ok, i've come to the conclusion that the relay is dead, it just seems odd that within a year it already needs to be replaced, is there any particular reason that it only lasted as long as it did?
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Old 12-18-2005, 12:08 PM   #12 (permalink)
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Re: 7.3L starting problems, glow plugs?

Depends on the relay. Some just can't handle the high current the glow plugs draw. That is one reason I switched over to a Stancor relay. These are a heavy-duty relay and they seem to be able to handle the high current better. Click Here
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