glow plug replacement - TheDieselGarage.com
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post #1 of 19 (permalink) Old 12-09-2007, 10:16 PM Thread Starter
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glow plug replacement

so i have determined that replacing the glow plugs are needed. i put the ohm meter on each one getting no reading on 7 or 8 plugs i believe i did this test right any advice on testing would be helpful. i am worried however that my plugs may be carboned up and that i have read is a real bear. and if they break off then basically you have to pull the head which is extremely over my head. however i'm trying to do the glow plug replacement on my own.. ekkk... any tips tricks and advice would be extremely appreciated


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post #2 of 19 (permalink) Old 12-09-2007, 11:48 PM
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The 7.3L PSDs are not known for failing GPs, and they do not get stuck anything like they did in the 6.9L/7.3L IDI engines.

I find it almost impossible that you have 7 or 8 of 8 GPs bad. I have replaced three to date, since 1994 when the 7.3L PSD came out. It's possible, but it would be the first I have seen it.

Take a TEST LIGHT, any one will do. Connect the (normally ground) clip to a BATTERY POSITIVE source. Touch the tip of the test light to the tip of each GP. If the light lights, that GP is good, if not, it's DOA. That is the best test I know of.

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post #3 of 19 (permalink) Old 12-10-2007, 12:20 AM Thread Starter
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re question

ok so say that i only have 1 or 2 that need replaced would that make a huge difference on cold starting. it WILL NOT start if its cold out unless plugged in and i just replaced the glow plug relay yesterday without results. also with the volt meter on dc i tested the output side sometimes however the output side aka one with 2 wires does not have volts most of the time though it does.... thanks
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post #4 of 19 (permalink) Old 12-10-2007, 01:08 AM
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On a powerstroke, one or two bad GPs will not typically cause a no-start condition. With the older IDI style engines, one will bad GP can kill it dead at 40*F!

When you measured your voltage, and it sounds like you did everything correctly, and it's working, how many volts were there (on the output stud)? You NEED to have the same as battery voltage, or at least within 1/2 volt. So if you get 11.5 at the battery (+), you need at LEAST 11.0 at the GPR output terminal.

Given that you just replaced the GPR, I would think this will be ok, but if it's low, check all you wiring back to the battery. You may just have a bad power connection.

Also, a weak starter may not spin the engine fast enough to get it to start. It turns over, just not fast enough. I have seen that before.

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post #5 of 19 (permalink) Old 12-10-2007, 02:35 AM Thread Starter
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its official

i just did your test with the test light all glow plugs on the drivers side=dead
passenger side very front terminal was the only one that tested positive... dang thats prolly the reason for such cold starts ehhhh... after removing the valve cover is it smart to go ahead and put bp rust buster before even trying to turn the glow plugs? also has anyone had luck with the bosche glow plugs?? there available at the local autozone for like 15.00 cant buy motorcraft ones there and dont really want to go to the dealership....
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post #6 of 19 (permalink) Old 12-10-2007, 02:51 AM
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Do not go with the aftermarket glowplugs. Stick with the Ford or international. I replaced allmine with the $8 units form krapen and had to replace tehm less then a year later. Something else that I found was the number 1 gp wire was loose on the krapen gp but not on the Ford unit. Spend the extra money and you will be ahead of the game.

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post #7 of 19 (permalink) Old 12-10-2007, 02:53 AM
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you can spray them down with pb blaster if you want but I dont think it would make any difference because thay probably have plenty of oil on them already to lube them up. I have never had any issues with getting them out.

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post #8 of 19 (permalink) Old 12-10-2007, 02:58 AM
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Yep, that would cause hard starting.

LOTS of people (technicians) believe that if on GP is bad, do 'em all. Well on the older engines that was sound advice, it's not on a Power Stroke.

In your case, I would bet that you have aftermarket GPs in there, which is why they are all dead. Aftermarket plugs simply do not last.'

Please let us know if they are OEM or aftermarket once you get them out!

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

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post #9 of 19 (permalink) Old 12-10-2007, 05:49 AM Thread Starter
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planning on doing the replace this week..

i'm looking forwards to finding this info out just as much as you. i bought this truck last december with 98,000 on it. the guy before me had a 6 position chip on it and did some mods. basically he burnt up the engine and ended up cracking the block i bought it from the dealer that he traded it off to. i found this info from the guy who traided it off. basically ford put in a new engine at 90,000 so i got it with 8,000 miles on it. but am finding i'm doing alot of the routine maint on a truck with a 100,000. such as new started, new alt, new batts, new gp relay, new serpentine belt, a few other things i'm too frustrated to think of right now. the truck runs great just a few things here and there. once i finally get all the little stuff about my truck fixed it'll be fine a dandy i hope. lol... basically i hope to keep it forever haha.. thanks for everyones advice!
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post #10 of 19 (permalink) Old 12-10-2007, 10:50 AM
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1) there is a better test than using the test light like John mentioned, it's called an ohm meter. Just because a GP is good enough to turn on the bulb in a test light doesn't mean it is performing 100%, it just means it is not COMPLETELY burned out, but it could be making as much heat as a frog fart (very little). I don't remember what the resistance should be, but I can look it up for you.

2) You can get MOTORCRAFT glow plugs from Auto Zone for 2.99 a piece right now. Type ZD11 into the search on their website and print off the page, take it into the store in case they try to give you a different price. I would recommend replacing the relay as well, they're cheap. You can get a GPR109 from napa for around 20

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