Glowplug Test Ohm values

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Aug 6, 2008 | 12:55 PM

rayashworth

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From: Minnesota

Glowplug Test Ohm values

The problem is that my truck has difficulty starting below 40 degrees. Takes about 6 to 8 cranks to get it started, it does blow white smoke. I read about testing the glowplugs and here are the results of the test.

I finally got an opportunity to test the resistance on my glowplugs.

passenger side, all plugs are at .3/.4 ohms.

drivers side, all plugs are at .9/1.0 ohms.

Is the drivers side to high?

I am also going to look at replacing the relay.

Thanks
Ray

Aug 6, 2008 | 01:21 PM

Pocket

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From: Parker, CO

Usually you'll start to replace glow plugs over 1.5 ohms. I would have to say your relay is to blame.

Aug 6, 2008 | 01:23 PM

PaysonPSD

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From: Payson, AZ

The readings should be between .6 and 2.0 ohms. Why there is such a difference between the to sides is strange. At least there is continuity. I would test the GPR before worrying to much about the GPs. This is the test I use.

Keep in mind that the length of time the GPR is operated depends on the temperature. The warmer the ambient temp the shorter the time the GPR will be operated.

Edit: Also keep in mind that he length of time the Wait To Start lamp is on has no relation to the length of time the glow plugs are on. If the GPR checks out good just wait awhile longer to start after the WTS goes out.

Aug 6, 2008 | 01:26 PM

rayashworth

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From: Minnesota

Thanks, I will work on the GPR and post later next week.

Aug 22, 2008 | 01:33 AM

rayashworth

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From: Minnesota

I installed the bigger GPR that guzzle had information on for $45. The old one seemed to work, but it was melted around the main battery lead. Now just need to wait for cold weather to see if all my efforts have paid off. I also replace the fuel filter.

Nov 25, 2008 | 10:36 AM

rayashworth

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From: Minnesota

The GPR replacement has solved the starting problem. Truck is starting great blew 40 degrees. 29 is the coldest start so far. I expect it to start fine below 20.

Link to the mod: Welcome to guzzle's Stancor GPR replacement Mod Web Page