1993 hard start - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 11-23-2010, 02:49 AM Thread Starter
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1993 hard start

I bought a 1993 f-250 turbo diesel and it will not hardly start with out being plugged in, and even with it plugged in it is still having some problem starting. I left it unplugged last night and it is 50 degrees out and it would not start with out being plugged in today. I just put in some new glow plugs and that still did not help. Any thoughts y it is doing this? thanks Mitch
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post #2 of 13 (permalink) Old 11-23-2010, 07:25 AM
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Does the wait to start lamp illuminate for at least 4sec if not closer to around 20sec when cold) Are you sure the glow plug relay/controller is working? Is there power to glow plugs when you key it on? Does the cold start advance and high idle solenoid work (both on IP)? Are the batteries and starter good? Sorry for the questions but a little more info will help out here.

Listen for the glow plug relay to click when you key the ignition on, check the engine harness connections for damage. check fuse links in engine harness and off of the B+ side of the starter relay. check the trigger wire on the relay for power when key is on.

If you dont have the cold start advance and high idle you might check that your getting power through the cold start switch which is right behind the thermostat housing. I doubt this is the direction for your concern but these functions do help in cold starts and running.

I know you said they are new but there are easy steps to test glow plugs themselves. Unplug the wire at to of glow plugs, either measure resistance (less than 2ohms) or connect a test light to battery+ terminal. then probe all 8 glow plugs individually. If the GP is good the test light should light.

My motto: Be nice, be polite, but have have a plan to kill everyone that you meet.

94 F250 IDI turbo, auto 2wd.. ATS housing, 3" down, 4" exh, guages. 104k miles got totalled by a damn mustang (parts now).

98 12v, 4x4 quad cab. auto with BD T/C & V/B, Banks Big head, Exh brake, AFC modded, 16.5ish*, KDP gone, 60lb springs, 4K-GSK, BHAF, pyro, trans, and boost guages. 4" straight pipe,

72 AM General M35A2, LDT465-1C "Whistler" Turbo, PTO winch.
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post #3 of 13 (permalink) Old 11-23-2010, 03:38 PM Thread Starter
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Yeah the start lamp when it is cold is about 10 sec around there. The guy I bought it off of said he put a new relay on it, and the relay does click but i need to check it to make sure. When it is plugged in, it will start if I pump the throttle some. When it does start it has a high idle for about 3-4 sec, but is that from me pumping it and it getting to much fuel? But if I don't pump it, it has a lot harder time starting. There is new batteries in the truck and the starter seems to be good. Thanks 4Play
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post #4 of 13 (permalink) Old 11-23-2010, 04:07 PM Thread Starter
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Ok so i was checking the glow plugs like you said and the test light did not come on I checked two of them. I went to pull out one of the glow plugs and put a new on in to see if the light would come on and the new glow plug that i put in last week is swelled so how do i get it out? So i am guessing my new glow plugs are bad?? What the heck would make the new glow plugs bad after just a week?
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post #5 of 13 (permalink) Old 11-24-2010, 03:42 AM Thread Starter
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I found my problem all my new glow plugs are bad, and i just put them in 5 days ago? So what would make that happen? The relay is kicking off after 23 secs so i don't know what to think!
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post #6 of 13 (permalink) Old 11-24-2010, 02:17 PM
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If they are not OEM (Ford/Motorcraft/International) they will fail and fail and fail...... forever.

Even with OEM GPs, if you get 5 years from them all, you are doing ok. Some go longer, some shorter, but 5 years is about the average.

Pumping the accelerator doesn't hurt anything at all, you are not pumping fuel in, you are setting the cold start device into fast idle mode, that is all and a good thing. Just don't stab the accelerator WHILE you are cranking it over or after it starts.

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post #7 of 13 (permalink) Old 11-24-2010, 02:53 PM Thread Starter
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So you are saying i got crappy glow plugs, I put the same one that were in the truck which were 1108 Auto Lights. But you are saying i need to get Better glow plugs and they will not burn up in 5 days? You think for sure it is just crappy glow plugs and not anything that the truck would have done to burn all of them up? Thanks
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post #8 of 13 (permalink) Old 11-25-2010, 12:12 AM
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The GPs operate on 12V, all the time, every time.... unless it was boosted off with a 24V charger or something.

They SHOULD last 5+ years, if you buy something that doesn't last as long as it should, well in my book that equals a junk part.

Aside from ether (starting fluid) and using too much voltage with a charger/booster there is really nothing that would cause them to fail on the engine/truck side unless they never turn off (relay stuck etc).

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post #9 of 13 (permalink) Old 11-25-2010, 12:52 AM Thread Starter
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I did put a 12v charger on the truck and the booster was on for a little bit. so you think that's what it was?
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post #10 of 13 (permalink) Old 11-25-2010, 03:12 AM
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The charger could have done it, but what was said earlier about the glow plugs is that a lot of people have considered anything but the motorcraft glow plugs to be junk. Replace them with Motorcraft or another brand stating "BERU" on them.

The glow plug relay could have stuck on causing the plugs to burn up too. I would make sure the relay is good. It seems hard to imagine that all 8 plugs could burn up in 5 days just because they are cheap or junk plugs.

My motto: Be nice, be polite, but have have a plan to kill everyone that you meet.

94 F250 IDI turbo, auto 2wd.. ATS housing, 3" down, 4" exh, guages. 104k miles got totalled by a damn mustang (parts now).

98 12v, 4x4 quad cab. auto with BD T/C & V/B, Banks Big head, Exh brake, AFC modded, 16.5ish*, KDP gone, 60lb springs, 4K-GSK, BHAF, pyro, trans, and boost guages. 4" straight pipe,

72 AM General M35A2, LDT465-1C "Whistler" Turbo, PTO winch.
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