Wow, this is huge! I have a ‘21 F150 w a 3.5 EB engine that I have had problems since day 1 of engine misfire when under slight load on inclines on the road. I currently have 40k miles and I have 6 new Motorcraft OEM plugs ready to replace the existing plugs. Using a tip from a recent vid. from the fordtechmakuloco channel I plan to determine which plug is misfiring. I will measure the plug gap and resistance for each new plug that is going in and also measure each plug coming out. The only other major variable in the spark equation is the energy supplied from the individual coil packs for each plug. If understanding and controlling the first two variables doesn’t get me to a smooth running engine then hopefully I can discover a way to measure the coil pack voltage/resistance/energy output for this variable.
Well, I hope this video helps in some way. I will be doing other videos on test HT leads, coil packs etc in the near future, so please stay tuned. Intermittent electrical faults are a pain, but you'll get there!
One thing I have found about spark plugs: variance in resistance through the plugs has virtually zero effect on performance unless the plug is defective out of the box, or damaged on installation. This is from more than 40 years of experience in the automotive industry and racing. Plugs will either work or they don't work. Yes, it's not a bad idea to test them, as I test every plug before I put it into my race car, but unless something is seriously wrong with them, you are more or less chasing ghosts.
Yes, true. This is a just technical exercise really. As you say, you tend to find it open circuit and u/s or have an nominal amount of resistance. As you says, it’s worth checking them before putting them in though.
Unfortunatly all the different types with have different resistance values. The easiest way is to test all four and look for one that is out compared to the other three
You evaluated the measurement result incorrectly. The value read from the instrument in the 200 KOhm measurement limit is not Ohms, but kOhms, so the measurement results are not in Ohms, but in KOhms. The two are not the same, don't mix them up. It doesn't matter if it's 5 Ohm or 5 KOhm...
😮Masha Allah
Thanks!
Wow, this is huge! I have a ‘21 F150 w a 3.5 EB engine that I have had problems since day 1 of engine misfire when under slight load on inclines on the road. I currently have 40k miles and I have 6 new Motorcraft OEM plugs ready to replace the existing plugs. Using a tip from a recent vid. from the fordtechmakuloco channel I plan to determine which plug is misfiring. I will measure the plug gap and resistance for each new plug that is going in and also measure each plug coming out. The only other major variable in the spark equation is the energy supplied from the individual coil packs for each plug. If understanding and controlling the first two variables doesn’t get me to a smooth running engine then hopefully I can discover a way to measure the coil pack voltage/resistance/energy output for this variable.
Well, I hope this video helps in some way. I will be doing other videos on test HT leads, coil packs etc in the near future, so please stay tuned. Intermittent electrical faults are a pain, but you'll get there!
One thing I have found about spark plugs: variance in resistance through the plugs has virtually zero effect on performance unless the plug is defective out of the box, or damaged on installation. This is from more than 40 years of experience in the automotive industry and racing. Plugs will either work or they don't work. Yes, it's not a bad idea to test them, as I test every plug before I put it into my race car, but unless something is seriously wrong with them, you are more or less chasing ghosts.
Yes, true. This is a just technical exercise really. As you say, you tend to find it open circuit and u/s or have an nominal amount of resistance. As you says, it’s worth checking them before putting them in though.
but isn't it bad for the coil if the resistance is really high ? Wouldn't that cause a faster failure of the coil may be ?
@@aneeshprasobhan it would depend on the amount of resistance. OEM have literally thousands of ohms of resistance and have no issues....
@@markgoulette5056 OEMs are bwtween 4k-5k tho
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Hello! Sir can u please tell me the resistance range where we know spark plug is in good condition or not???
Unfortunatly all the different types with have different resistance values. The easiest way is to test all four and look for one that is out compared to the other three
@@AdamMechanic
irridium plugs have same resistance??
how many resistance range in irridium plugs have??
If the resistance is between 4-15kilo ohms,then Spark plug is considered good.
You evaluated the measurement result incorrectly.
The value read from the instrument in the 200 KOhm measurement limit is not Ohms, but kOhms, so the measurement results are not in Ohms, but in KOhms. The two are not the same, don't mix them up. It doesn't matter if it's 5 Ohm or 5 KOhm...
Hi Peter, the multimeter was set on 20k, so 20KOhms. One KOhm is 1000 Ohms, so yes I should have said 20 KOhms technically, but its still 20K.
Bro those are 4,500 ohms not 4.5ohms
Yes, it’s set at 20k, so it is in the thousands
The correct reading should be 4.5 kilo ohms Sir.