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Old 09-02-2013, 05:56 PM
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starting Issues for a '97 Powerstroke

Hello, I'm new to the forum and still trying to figure it out, sorry if I'm missing something.

This is my issue . . . I have a '97 f350 Powerstroke. I'm the original owner and love the old gal. 231k miles. All last winter it was hard starting. Had the glowplugs changed. Wouldn't start unless plugged in. Put in two heavy duty batteries. Hard starting. Had the Glow plug relay replaced. Still hard starting. This summer would not start under 60 degrees unless plugged in. I live at 10k feet in Colorado. I had to plug in every morning. Fuse 22 is intact. The "wait to start" light works fine. The tach registers when cranking. New starter a year a go. I just checked and the Glow plug relay is making a loud buzzing noise when the key is turned. Maybe that's normal. I'm not quite sure how to make sure the relay is getting the juice it needs. When it's cold and trying to start it emits white exhaust from under the hood and tail pipe. I don't know if that's significant or not, but thought I would mention it.

The wife wants me to sell the truck, I refuse. I'm going to be buried in it. Before I take it back into the shop and drop another thousand though, I'd thought I check with you folks.

Thanks,

Steve
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Old 09-17-2013, 03:11 PM
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No, the glow plug relay should NOT buzz.

GPR test - check the voltage at each big terminal, key off. One terminal should show battery voltage (12.5-ish), the other should show zero. Turn the key to RUN and check again. The "always hot" terminal will show lower voltage, probably 11.5-ish. The other terminal should now show voltage, a little less than the always-hot terminal. But if the difference between the two, while the key is in RUN, is more than 0.3V, the relay is weak and should be replaced.

Glow plug test - disconnect each UVCH, and measure resistance from each outer pin to ground. Resistance should be just about 1.0 ohms. Much more or less, or "open" (infinite resistance) indicates that glow plug is faulty, or a wiring problem under the valve cover.

Are you sure you got a relay that does _not_ ground through its mounting base?
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