Need coil resistance readings - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-07-2005, 09:38 AM   #21
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Gremlins.

Measurements above were on Sunday while talking to TuType. I remeasured the 93 yesterday (MSD'*) and got:

7.48
7.50
7.49

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Old 12-08-2005, 01:38 AM   #22
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This is strange someone may want to try this.

These resistance readings were taken the other day with the car stone cold and outside temp 40*.

Original 96 Regal L36 Coils

Coil 6-3 = 5,38 K ohms @ 40*

Coil 2-5 = 5,52 K ohms @ 40*

Coil 4-1 = 5,45 K ohms @ 40*

Checked today with motor at operating temp and all readings were 1000 ohms higher.

Checked again 3 hours later 40* outside and resistance is back down 1000 ohms?

Made sure VOM and leads were working properly by using a 6.7K resistor as a benchmark before and after each resistance reading.
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Old 12-08-2005, 10:44 AM   #23
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Mine were stone cold both times.
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Old 12-08-2005, 10:53 AM   #24
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I think mine were about 55 degrees. Only because my garage seems to always be that temp.
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Old 12-12-2005, 01:19 AM   #25
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It looks as if I started an interesting thread. Well, I'm still a bit confused. When speaking with WillWren last week I tested my original (1997 L67) coils, and newly purchased MSD coils. However, after speaking w/a friend on the LeSabre T-Type Forum and a tech at MSD I was checking my coils incorrectly.

I initially tested the secondary'* (top leads where the spark plug wires connect) with the secondary. But was told I should've tested one secondary coil with one primary (bottom lead, which plugs onto the ICM) coil, or primary to primary.

It was difficult to get a good connection from the primary lead, so I tore off the bottom of one of my bad coils and got a good connection, but no reading (when I tried to test it from primary to primary, or primary to secondary), both was no reading. Thus the only was I got a reading was secondary to secondary.

Question Was the MSD tech correct? And if so, why did I not receive a reading when trying to test the coil primary to secondary and primary to primary?

ps. WillWren I did replace that one original L67 looking coil. MSD tech also stated they never had any bad stock/output/recall of their coils.


-TuType
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Old 12-12-2005, 01:31 AM   #26
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Found some interesting coil pack readings.

Couple days ago, Bill PM'd me about checking the coils on the 95. It always idled a little funky and it had been on my mind (I asked in another thread about the 94SE to 95SSEi compatibility.)

Anywho, I checked my packs and found the 1/4 pack tested at 5.2 while the other two tested at 6.2 and 6.3 respectively. While waiting for my wife to finish up work, I quickly swapped in the old ones from the 94 that tested at 6.1 6.3 6.3. My idle cleared up nicely.

Last night, Bill was testing the 93 that Tracey'* (Singscountry1967) son now owns since I had mentioned that this solved the funky idle problem and found 1 pack was testing at 9.something while the other two were in the 6ish range. I gave him one of the 6.3 packs from the old set and the 93 started behaving itself. I guess these things need to be putting out closely matched voltage for best performance?
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Old 12-12-2005, 01:37 AM   #27
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Quote:
Originally Posted by TuType
It looks as if I started an interesting thread. Well, I'm still a bit confused. When speaking with WillWren last week I tested my original (1997 L67) coils, and newly purchased MSD coils. However, after speaking w/a friend on the LeSabre T-Type Forum and a tech at MSD I was checking my coils incorrectly.

I initially tested the secondary'* (top leads where the spark plug wires connect) with the secondary. But was told I should've tested one secondary coil with one primary (bottom lead, which plugs onto the ICM) coil, or primary to primary.

It was difficult to get a good connection from the primary lead, so I tore off the bottom of one of my bad coils and got a good connection, but no reading (when I tried to test it from primary to primary, or primary to secondary), both was no reading. Thus the only was I got a reading was secondary to secondary.

Question Was the MSD tech correct? And if so, why did I not receive a reading when trying to test the coil primary to secondary and primary to primary?

ps. WillWren I did replace that one original L67 looking coil. MSD tech also stated they never had any bad stock/output/recall of their coils.


-TuType
You will get an open circuit if you probe primary to secondary. Primary to prmary should get you less than on ohm, secondary to secondary should get you 5.5 to 7 somewhere.
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Old 12-12-2005, 01:50 AM   #28
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Quote:
Originally Posted by J Wikoff
Quote:
Originally Posted by TuType
It looks as if I started an interesting thread. Well, I'm still a bit confused. When speaking with WillWren last week I tested my original (1997 L67) coils, and newly purchased MSD coils. However, after speaking w/a friend on the LeSabre T-Type Forum and a tech at MSD I was checking my coils incorrectly.

I initially tested the secondary'* (top leads where the spark plug wires connect) with the secondary. But was told I should've tested one secondary coil with one primary (bottom lead, which plugs onto the ICM) coil, or primary to primary.

It was difficult to get a good connection from the primary lead, so I tore off the bottom of one of my bad coils and got a good connection, but no reading (when I tried to test it from primary to primary, or primary to secondary), both was no reading. Thus the only was I got a reading was secondary to secondary.

Question Was the MSD tech correct? And if so, why did I not receive a reading when trying to test the coil primary to secondary and primary to primary?

ps. WillWren I did replace that one original L67 looking coil. MSD tech also stated they never had any bad stock/output/recall of their coils.


-TuType
You will get an open circuit if you probe primary to secondary. Primary to prmary should get you less than on ohm, secondary to secondary should get you 5.5 to 7 somewhere.
This statement by Jwikoff is absolutely correct. In addition, to contradict what you say the tech at MSD said, this information is directly from MSD'* website:



Quote:
Primary Resistance: 0.35 ohms
Secondary Resistance: 7.8K ohms

Maximum Voltage:
40,000 volts
Inductance: 4.2 mH
Turns Ratio: 80:1
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Old 12-13-2005, 01:38 AM   #29
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Hey willwren,
I remember seeing the primary & secondary info on MSD'* site. My main concern was, did I test the coils correctly? Primary to Primary and Secondary to Secondary or Primary to Secondary? The tech also mentioned the secondary should be ard 7.8 ohms. Again, just trying to confirm if I'm testing the coils correctly...

Thanks very much everyone,

ps. Just thinking out loud. I'm sooooo glad we have the internet and forums like this. This board and my main board www.lesabret.com are wonderful.

Thanks again guys and gals,

-TuType
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Old 12-13-2005, 01:42 AM   #30
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You measured correctly.
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