7.3 gurus

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Re: 7.3 gurus

Post  bbf-falcon on November 19th 2014, 6:38 pm

Thx Todd,i will check that out.Smile

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Re: 7.3 gurus

Post  aquartlow on November 19th 2014, 10:12 pm

You're very welcome. Here is a write up on checking the GPR and glow plug resistance:
http://www.dfuser.com/Install%20Guides/How%20to%20check%20for%20a%20bad%20Glow%20Plug%20Relay.pdf
There is LOTS of info on 7.3's over at www.thedieselstop.com or www.ford-trucks.com. Hope this helps. Todd
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Re: 7.3 gurus

Post  jbozzelle on November 21st 2014, 10:16 pm

Jump the GPR with a set of pliers for a few minutes and give it a go. If it runs fine once it starts then there's your problem. Mine wouldn't run fine until it WARMED up and it ended up being the injectors...

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Re: 7.3 gurus

Post  69F100 on November 21st 2014, 11:20 pm

Mine was the GPR replaced it this morning after jumping the old one out and mine fired right up so I replaced it will see if it fires up right in the morning
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Re: 7.3 gurus

Post  bbf-falcon on November 22nd 2014, 12:06 am



I haven't had a chance too check it out too much but,i'm leaning toward the relay right now. Thx for the info guy's.

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Re: 7.3 gurus

Post  IDT-572 on November 22nd 2014, 2:05 am

The GPR stays on a good while after the light goes out, mine is on maybe over a min. You can watch your voltage gauge and tell if it's working and when it turns off.

Make sure not to put a old style starter relay on it as the oem relay is grounded on by the ECM.

Also stay away from the AUTOLITE glow plugs, they sometimes swell when they fail and are almost impossibe to get out.

My truck has 297,000 on it and at around 20 degrees it has to be heated about three cycles to start.

I decided to just plug mine in when it gets that cold. I have an extension cord plugged into a timer that comes on about 2 hr's before I leave for work, 1 hr may do it.

Starts like a champ and have heat in the cab in about a mile and a half.
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Re: 7.3 gurus

Post  bbf-falcon on November 23rd 2014, 1:05 am

That timer is a good deal Blake,I found out the hard way last year not too leave it plugged in a long time. My shop elec. bill was Crazy high until I figured it out. Rolling Eyes

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Re: 7.3 gurus

Post  nord315 on November 23rd 2014, 11:50 am

Make sure if you use a timer, it is a heavy duty one. Been using a timer on my vehicles for 30 years.

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Re: 7.3 gurus

Post  69F100 on November 23rd 2014, 4:12 pm

The relay I put on mine was a starter solenoid after I got to checking the part number it was behind the seat of my 93 when I bought it and someone had wrote on the box for glow plugs. I put it on my 95 and it would not work so I check the numbers and it is for the starter so I ordered the kit off eBay to make mine into manual glow plugs. I will post back on how it works when I get it and get it installed and try it out.
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