Poor mans buzz test - Ford Powerstroke Diesel Forum

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post #1 of 17 Old 12-31-2013, 09:05 AM Thread Starter
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Poor mans buzz test

Replaced GP's, checked relay and UVCH. Seemed to fix the cold start problem for a bit, but now it won't start unless it's plugged in. Tried a little starter fluid with no help. Could it be the injecters? Heard there was some way to test them without a scanner?
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post #2 of 17 Old 12-31-2013, 09:26 AM
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Thought you say it fixed the cold start? What oil you using with how many miles? Batteries good?



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post #3 of 17 Old 12-31-2013, 09:34 AM
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How exactly did you check the relay?
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post #4 of 17 Old 12-31-2013, 10:08 AM
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How's the starter? A new starter fixed my cold start issues even after I did the GP's and GPR the starter made the biggest difference.
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post #5 of 17 Old 12-31-2013, 10:34 AM Thread Starter
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It seemed to start fine for about a week after I replaced the GP's.Batteries are full charge and a new starter.Checked the relay for power through. Clicked off after two minutes and there is power to the GP's at the pigtail. Oil is 15/40. I heard it might be better at 5/40, but it's 25-30 degrees out. Can there be that much difference?
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post #6 of 17 Old 12-31-2013, 11:11 AM
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TEST the relay. Turn the key to RUN, and check the voltage at each of the big terminals. The key is the difference in the voltage. The "hot" terminal may be slightly higher than the one going to the glow plugs, but if the _difference_ is more than 0.3V, the relay is not providing adequate power to the GPs.
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post #7 of 17 Old 12-31-2013, 11:29 AM Thread Starter
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Just checked the GPR across the big terminals with the WTS light on it shows no drop in voltage at all. What am I missing here? About ready to pull the VC's again.Thanks
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post #8 of 17 Old 12-31-2013, 11:33 AM
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What brand of glow plugs did you install? You can at least check the resistance of the GPs without removing the valve covers.
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post #9 of 17 Old 12-31-2013, 11:36 AM
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Oil should be fine for those temps.



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post #10 of 17 Old 12-31-2013, 11:39 AM Thread Starter
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I used Bosch. I checked the Ohms at the connectors. All read the same.
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