Glowplug relay
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Joined: Aug 2012
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Glowplug relay
I have a E99 F350 CC 4X4 LB DRW 7.3 136K Miles. My truck was taking for ever to start and blowen white smoke. After if started it ran fine, and would start with no issues. So I check the glowplug relay and I had 12.3 V on the line side. The load side I would only have 9V. I replace it with a new one from Napa (Westbay) Auto parts. Now the truck sounds like I have a dead battery when I start it. It does start, but it does this everytime I start it. I check the new glowplug relay I have 12.3 V on the line side, and 10 V on the load side when the wait to start light is on. When the wait to start light goes off the voltage on the load side goes from 10V to 11.3V. Not sure why it's barely turning over now. Is the new growplug relay I got bad too. The glowplug relay is making a loud clicking noise now too while the wait to start light is on. Any input would be great. Thanks
Fleet Owner
Joined: Mar 2012
Posts: 26,198
Likes: 4,151
From: Near Cal. Avenue
U probably have a weak battery. Have it and the alternator tested. A weak battery rears its head with the application of the glow plugs power draw. If it can't sustain voltage the relays begin to click. It may be so simple as corroded cable connections. Anywhere in the cables.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
The WTS light is just a timer and does not indicate if the GPR is operated or for how long.
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From the Ford service manual:
The 7.3L diesel engine uses a glow plug system that preheats air in the combustion chamber to improve cold engine starting.
The system consists of:
<DIR><DIR>glow plugs.
glow plug relay.
glow plug module ( CA Trucks and Excursions)
powertrain control module (PCM).
engine oil temperature (EOT) sensor.
barometric pressure sensor (BARO sensor).
</DIR></DIR>The glow plug system is electronically controlled by the PCM. If the oil temperature is below 131°F (55°C ) the PCM will energize the glow plugs immediately after the key is placed in the ON position.
Then, depending on the readings from the engine oil temperature (EOT) sensor and the barometric pressure (BARO) sensor, the PCM determines how long the glow plugs will be on.
Glow Plugs — PCM-Controlled
The glow plugs are located in the cylinder heads, under the valve covers.
The glow plugs are self-regulating. If the engine oil temperature is above 131°F (55°C ), the PCM will bulb-check the WAIT TO START lamp but not energize the glow plug relay or control module.
The PCM system uses the glow plug module (if equipped) to conduct current to the left and right bank glow plugs.
The PCM protects the glow plugs by energizing them for short durations if the battery voltage is abnormally high.
The glow plug ON time varies from 0-120 seconds depending on battery voltage, engine oil temperature and barometric pressure.
On California vehicles the glow plug monitor (GPM) system is part of the On-Board Diagnostics II (OBD II) System.
The GPM system is designed to find failed glow plugs or failed wiring in the glow plug system.
A failure in the glow plug system will set a diagnostic trouble code (DTC).
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--------------------------------------
From the Ford service manual:
The 7.3L diesel engine uses a glow plug system that preheats air in the combustion chamber to improve cold engine starting.
The system consists of:
<DIR><DIR>glow plugs.
glow plug relay.
glow plug module ( CA Trucks and Excursions)
powertrain control module (PCM).
engine oil temperature (EOT) sensor.
barometric pressure sensor (BARO sensor).
</DIR></DIR>The glow plug system is electronically controlled by the PCM. If the oil temperature is below 131°F (55°C ) the PCM will energize the glow plugs immediately after the key is placed in the ON position.
Then, depending on the readings from the engine oil temperature (EOT) sensor and the barometric pressure (BARO) sensor, the PCM determines how long the glow plugs will be on.
Glow Plugs — PCM-Controlled
The glow plugs are located in the cylinder heads, under the valve covers.
The glow plugs are self-regulating. If the engine oil temperature is above 131°F (55°C ), the PCM will bulb-check the WAIT TO START lamp but not energize the glow plug relay or control module.
The PCM system uses the glow plug module (if equipped) to conduct current to the left and right bank glow plugs.
The PCM protects the glow plugs by energizing them for short durations if the battery voltage is abnormally high.
The glow plug ON time varies from 0-120 seconds depending on battery voltage, engine oil temperature and barometric pressure.
On California vehicles the glow plug monitor (GPM) system is part of the On-Board Diagnostics II (OBD II) System.
The GPM system is designed to find failed glow plugs or failed wiring in the glow plug system.
A failure in the glow plug system will set a diagnostic trouble code (DTC).
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Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
Make sure you disconnect the batteries from each other. They need to be tested individually. Take the power cable off the drivers side battery and test it, then the passengers side. Once complete hook up the drivers side or install new batteries. Most likely you have a dead cell in one of them. They BOTH need changed though.
Costco has a good price on batteries if you have one nearby.
Costco has a good price on batteries if you have one nearby.
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No2Oil
1999 - 2003 7.3L Power Stroke Diesel
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Feb 7, 2006 09:31 PM
