7.3 Hard Start - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 03-08-2007, 11:01 AM Thread Starter
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7.3 Hard Start

The past 2 morning the truck has not wanted to start. Yesterday it was 13* at the time and took 3 tries to get it running, followed by the rough idle(lope) for a few seconds. Today the temp was 20* at the time and took 6 times to get it started followed by the rough idle (lope). Both days it would die as soon as I let go of the key. The needle on the tach was moving also. I checked the glow plug relay a few minutes ago, had battery voltage of the hot side (12.4v at the time) and also check the output side of the relay w/ key on (11.6v at its peak, followed by nothing when it clicked off). Truck has 82,xxx miles. I'll try again in the morning after thet truck has sit over night. Does this sound the the glow plug relay or something else?

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post #2 of 14 Old 03-08-2007, 04:45 PM
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how long does the relay stay on? Are the batteries good? may be glowplugs.

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post #3 of 14 Old 03-08-2007, 07:41 PM Thread Starter
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Quote:
Originally Posted by pipelayerjdh View Post
how long does the relay stay on? Are the batteries good? may be glowplugs.
Relay stays on for MAYBE 30 seconds, if that

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post #4 of 14 Old 03-08-2007, 08:12 PM
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Gp's

It should usually stay on longer then that, but regardless it sounds like you might have a few bad gp's. The longest it is allowed to stay on is 120 seconds.
post #5 of 14 Old 03-08-2007, 08:22 PM
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that relay should be staying on at least 50 seconds at 15 or 20 degrees....sounds like a possible bad GPR to me....and jon may be right as well, you coudl have a few bad glow plugs. Test the relay in the morning and count the seconds. Also, if it doesnt start on the first try...try cycling the key about four times without trying to start...cycleing it each time the wait to start light goes out....if it starts then replace the relay...
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post #6 of 14 Old 03-09-2007, 06:05 AM Thread Starter
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How do I test the glow plugs? Do I need to pull the valve covers?

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post #7 of 14 Old 03-09-2007, 06:23 AM
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sounds like the same problem i had New batteries and relay took care of it

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post #8 of 14 Old 03-10-2007, 09:47 AM Thread Starter
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Ok, update. Was gonna post yesterday, but the site was down. I checked the GPR. It was open (sending voltage) for 1 min 41 sec. The voltage on the output side of the GPR got up to a max of 11v. Battery voltage at start was 12.35v and after was 11.92v. First attempt at start - Cranked good, lots of white smoke, no attempt at start. 2nd attempt - started, couple lopes, just a little white smoke. Smoke smelled like fuel. My un-educated guess is that I have back Glow plugs. How do I go about testing the glow plugs. Do I have to pull the valve covers? Started fine today, cycled the key 4 times but it was also 51* at the time this morning. Any ideas?

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post #9 of 14 Old 03-12-2007, 05:47 AM Thread Starter
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Bump bump

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post #10 of 14 Old 03-13-2007, 11:03 AM Thread Starter
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bumpity bumpity bump

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