still having troble starting need help
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still having troble starting need help
ok i poted a week or so ago about not being able to start my 86 f250 i thot i wasnt getting power to my glowplugs but i checked each plug is getting 12.73 volts but my truck still wont start without ether its in a garage that is about 70 degrees i dont have a regular test light i have a meter so idk how to check my glowplugs with that but all my glowplugs have less than 30 starts except one its kinda old so should i replace it? it worked just fine a few weeks ago and if only one glowplug is bad would that affect the entire motor?
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
Is your meter digital?
Does it have a resistace scale probably labled ohms?
If so, set it on the lowest ohms scale, remove the wire to the glow plug, touch one probe to the glow plug terminal and the other to the glow plug base.
You should see a reading of .5 to 1 ohm, but if the meter is a very inexpensive one it may read 0 ohms.
If the meter flashes, the connection is open, burnt out glow plug.
Caution, when the meter is set to resistance scale, voltage applied to the probes will blow the meter fuse or worse.
Probably a good idea to remove the battery grounds before you start.
Does it have a resistace scale probably labled ohms?
If so, set it on the lowest ohms scale, remove the wire to the glow plug, touch one probe to the glow plug terminal and the other to the glow plug base.
You should see a reading of .5 to 1 ohm, but if the meter is a very inexpensive one it may read 0 ohms.
If the meter flashes, the connection is open, burnt out glow plug.
Caution, when the meter is set to resistance scale, voltage applied to the probes will blow the meter fuse or worse.
Probably a good idea to remove the battery grounds before you start.
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which goes to the terminal the positive or negative? and ohms is the horsewhoe looking symbol right? i have a setting of 200k up im not sure if 200k is the lowest or if 200 is cause there isnt a definate line between ohms or the other setting. and if one glowplug is bad could that prevent the motor from starting even if the other are good?
Post Fiend
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which goes to the terminal the positive or negative? and ohms is the horsewhoe looking symbol right? i have a setting of 200k up im not sure if 200k is the lowest or if 200 is cause there isnt a definate line between ohms or the other setting. and if one glowplug is bad could that prevent the motor from starting even if the other are good?
Are you confident you do not have an air lock in the fuel system?
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From: manchester nh
yah i would check all the return lines and filter area for any sign of fuel arund them i had the same problem and mine was leaking right behind the breather on the hose going to the tank. and i could not get mine started eather it would just turn over after like an hour it would finley start
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From: Virginia
When you get the meter set on 200, touch the leads together. That's pretty much zero ohms, and that is what you are looking for when you touch the ground part of the glowplug, and the terminal part. They should be connected just like when you touched the leads together. Make sure you unplug the wire to the glowplug before you test it.
Post Fiend
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From: Nutter Fort, WV
12.73 volts at the glow plugs tells me unless all of the glow plugs were unhooked when that reading was taken they are burnt out.
My volt meter drops to aroung 10 volts when the glow plugs heat.
My volt meter drops to aroung 10 volts when the glow plugs heat.
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i ain't rite
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From: Marlboro Mental Hospital.
you say you have new glow plugs with less than 30 starts on them.
what type glow plugs are they??
if they are not MOTOCRAFT/BERU plugs, i bet they are already burnt out.
what type glow plugs are they??
if they are not MOTOCRAFT/BERU plugs, i bet they are already burnt out.
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ok i jus checked my glowplugs and the meter didnt do anything it read 1. never changed. and if my plugs were drawing power then if i tested the power on my batter would it read less when they were on?
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
With all glow plugs in good shape, my aftermarket volt meter on the dash drops to around 10 volts.
Dash lights dim if I have them on.
If the heater motor is running, it slows down a noticable amount.
Dash lights dim if I have them on.
If the heater motor is running, it slows down a noticable amount.
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ok my lights dont dim when i turn my glowplugs on and this just came up when i tested to see if i was getting power to them i grounded it to my battery when i tested each glowplug wire is that where i shoiuld have grounded it or should i have grounded it to my glowplug itself?
Post Fiend
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From: Nutter Fort, WV
Check this connector, the one circled in red.
If it looks melted, you are not getting full power to the glow plugs.
Glow plug test with an ohm meter, ground one probe to the engine or glow plug base.
Touch the other probe to the glow plug electrical terminal.
If it looks melted, you are not getting full power to the glow plugs.
Glow plug test with an ohm meter, ground one probe to the engine or glow plug base.
Touch the other probe to the glow plug electrical terminal.
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mine is melted i just got the wires back to their places and i pet the positive end to the terminal that goes over the glow plug and i grounded the negative end to the negative battery post woould that give me an accurate reading of how much power my glow plugs are getting?