7.3 Powerstroke Glow Plug Relay Reading 30 Ohms

How to diagnose faulty glow plugs in 10 steps

23 December 2020 | Article

The basics of a glow plug are easy to explicate. They are essential for ignition in diesel fuel-powered engines (equally opposed to spark plugs in petrol engines); they heat the air/fuel mixture in the engine then it ignites easily under compression; they are congenital to exist long-lasting and piece of work reliably no matter what happens. However, occasionally external factors or faults with other components can atomic number 82 to issues with glow plugs. Attributable to their rarity, these can easily exist missed or wrongly identified.

It is of import to regularly check and maintain glow plugs/ignition components, especially before winter flavor. If you or a customer has spotted a potential sign that their glow plugs are faulty, or at the end of their lifespan, the side by side step is to accurately found whether replacement plugs are needed. Thankfully, this is easier than ever to do, and can normally exist achieved without removing the glow plug from the engine. All you lot need is a multimeter and these 10 steps:

i: Get to know your multimeter

In essence, a multimeter is a box of electronic circuitry that can exist used to run a variety of tests on electrical wiring or devices (hence its name 'multimeter': multiple measurements). Yous may be extremely familiar with your model of multimeter already – simply if not, here is a refresher:

• The large dial in the middle of the multimeter is used to adjust the settings.
• The leads that come with the multimeter are used to test electrical current and resistance. These leads will be black (negative) and crimson (positive), and unremarkably have metallic clamps or pins at the finish of them. The pictured example has pins.

• A multimeter may be analog or digital. Analog multimeters have a changing brandish, which ways they can show you the electric current fluctuation. Digital multimeters show a definitive figure, which means they accept a difficult time measuring current that is constantly changing. However, digital multimeters are more than authentic overall than analog meters. Analog meters can also use higher voltage to the excursion digital meters, and then utilise them with care.

It is best to use a digital multimeter for this exam. It will bear witness the exact result of the examination, while an analog meter will list a range of results, making it harder to read/conclude. If you are using an analog multimeter, make sure to choose i with at to the lowest degree 20kohm/Five sensitivity.

2: Set your multimeter to Ohms

While the multimeter can seem daunting because of its many numbers and dials, you only need to use one setting for this examination: Ohms. The ohms setting volition exist denoted by the omega symbol (Ω) resembling a horseshoe. Unless you accept an auto-ranging multimeter, you will besides be able to prepare the maximum range for the test. You tin always change this during the test if you lot find y'all aren't getting a useful reading,

iii: Find the resistance value of your multimeter

Connect the two leads of the multimeter together, making sure the metal clamps/pins on the leads touch each other, and tape the result. If y'all are using a digital multimeter, the precise reading volition appear across the screen. At this indicate you lot may be able to use your multimeter's calibration function to adjust the reading to zero.

iv: Test the voltage of the bombardment

Put your multimeter in DC Volt reading fashion. The symbol denoting DC is ⎓: 2 lines, one solid and one dotted. Place the negative lead of your multimeter onto the negative terminal of the car battery, and the positive lead onto the positive terminal. The reading should be close to 12.five Volts when the car is off and close to 13 Volts when the car is running. If this is not the case, check your bombardment or alternator earlier proceeding, since they may be the cause of the consequence rather than the glow plugs. Glow plugs only work correctly if they have the correct voltage running into them.

five: Locate the glow plugs

The location of the glow plugs in the engine will vary based on the make and model of the respective vehicle. Consult the manufacturer'due south handbook for the vehicle to find the correct location.

6: Remove the caps or connectors to the glow plugs

There is usually a comprehend or cap over the glow plugs. Removing this volition allow you to use the multimeter clamps to the glow plugs. Look at the connector and pins for any signs of rust, corrosion or looseness. Accept this opportunity to clean them. This lonely could have a beneficial event.

7: Connect the multimeter's negative lead to a ground point in the engine

The main ii footing points can be institute by following the wire that leads from the negative battery terminal into the engine wall or following the wire that leads from the alternator into the engine wall. Again, y'all can consult the manufacturer's handbook to find the exact locations of the ground points.

The wires will exist attached to bolts. Clip the negative atomic number 82 onto one of these bolts for grounding.

8: Connect the multimeter'due south positive lead to the top of the glow plug

The multimeter should at present give a reading. This is when you can adapt the range setting on the multimeter to requite more significant figures, if required.

9: Evaluate the multimeter's reading

Refer to your shop manual to determine the acceptable resistance range for glow plugs in this vehicle – ordinarily it will be no more than 6 Ohms.

Subtract the resistance value of your multimeter from the resistance value of your glow plug. For example, if your plug's resistance measured .9 ohms and your meter's resistance measured .2 ohms, the existent reading for the plug is .7 ohms. If you zeroed the multimeter resistance earlier, y'all don't have to decrease anything now.

All the glow plugs in your engine should have similar readings. I glow plug with a higher resistance can bear upon your engine's operation – even if the plug appears functional otherwise.

10: Replace the glow plugs

If ane or more than of the glow plugs gives an unusually high reading, it should be replaced. However, we suggest that you supplant every plug – non just the one that appears to exist faulty!

If the surface area effectually the glow plugs has dirt or build-up, clean information technology offset. Some manufacturers offer special tools ("reamers") to clean out the bore where the glow plugs are inserted into the cylinder head. These tools clean out carbon build-upwards inside the combustion chamber or pre-charge chamber, as well every bit the threads that the glow plug screws into.

DENSO Aftermarket Glow Plugs

DENSO has a history of pioneering innovation in diesel engine components, always making improvements to quality and efficiency. It introduced the offset ceramic glow plugs for the OE market, and was behind the first mutual-runway diesel fuel engine in a production vehicle.

Today, DENSO offers its production and engineering science expertise to the aftermarket, including an all-makes, OEM-quality glow plug program. With fast estrus-upwardly times, long-lasting post-rut temperatures and first-class car parc coverage with a simple part reference system, DENSO Glow Plugs are designed to support the aftermarket in every style possible.

Discover out more about the DENSO Glow Plug range: https://www.denso-am.co.united kingdom of great britain and northern ireland/products/automotive-aftermarket/ignition/glow-plugs/

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Source: https://www.denso-am.eu/media/corporate-news/2020/deneur20_28_diagnosing-a-glow-plug/

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