Coils tested with multimeter... Are these readings ok?
#1
Racer
Thread Starter
Coils tested with multimeter... Are these readings ok?
90 C4
Stock black Bosch coils (made in spain)
1st Coil = Primary .001 (gauge set to 2k) and .9 (gauge set to 200)
Secondary 6.18 (gauge set to 20k)
2nd Coil = Primary .001 (gauge set to 2k) and .9 (gauge set to 200)
Secondary 6.08 (gauge set to 20k)
Just not quite sure the settings on the meter measuring across the primaries are correct.
Here are a few pics...
Thanks in advance for your help
Derek
Stock black Bosch coils (made in spain)
1st Coil = Primary .001 (gauge set to 2k) and .9 (gauge set to 200)
Secondary 6.18 (gauge set to 20k)
2nd Coil = Primary .001 (gauge set to 2k) and .9 (gauge set to 200)
Secondary 6.08 (gauge set to 20k)
Just not quite sure the settings on the meter measuring across the primaries are correct.
Here are a few pics...
Thanks in advance for your help
Derek
Last edited by dkcaims; 06-28-2012 at 08:45 PM.
#2
#3
Rennlist Member
Measuring high voltage coils with a ohmmeter will probably not produce reliable results. You will be able to discover basic short circuits and maybe differences in the readings between the two. But, you'll have to use a megger or other coil testing equipment to really determine any faults. These instruments are made to discover faults in the insulation in the high voltage winding.
Cheers,
Tore
Cheers,
Tore
#4
Racer
Thread Starter
I sent you an email
Thank you also Tore !
#5
Rennlist Member
Do you have an electrical problem, or just testing? I had values of 0.0 primary and 5.2 and 5.4 secondary, which are within the accepted range. Was dealing with "Christmas Tree". I have been told that even if the coils test O.K., they can have internal faults. I changed them, and it cured my problem.
#6
According to the workshop manual:
Primary resistor: Terminal 1-15 = 0.4 - 0.6 Ohms
Secondary resistor: Terminal 1-4 = 5 - 7.2 kOhms
I changed mine in order to solve Xmas tree. Mine were in the lower range of the secondary resistor. New ones were in the upper range.
Primary resistor: Terminal 1-15 = 0.4 - 0.6 Ohms
Secondary resistor: Terminal 1-4 = 5 - 7.2 kOhms
I changed mine in order to solve Xmas tree. Mine were in the lower range of the secondary resistor. New ones were in the upper range.
#7
Nordschleife Master
I agree with Lauren here, we just had an issue where the coil bench tested fine with an ohm meter but when put on a test stand would not fire. This was on a 993 and was the source of an issue on a new engine.
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#8
Racer
Thread Starter
Car runs fine, starts fine... but rich all of a sudden. 10.5 AFR at idle and low load.
AFR's were perfect the day before.
Looking into ground issues and cht sensor today.
Coils are back in the car for now.
AFR's were perfect the day before.
Looking into ground issues and cht sensor today.
Coils are back in the car for now.
#9
Racer
Thread Starter
Do you have an electrical problem, or just testing? I had values of 0.0 primary and 5.2 and 5.4 secondary, which are within the accepted range. Was dealing with "Christmas Tree". I have been told that even if the coils test O.K., they can have internal faults. I changed them, and it cured my problem.
https://rennlist.com/forums/964-foru...ning-rich.html
#10
90 C4
Stock black Bosch coils (made in spain)
1st Coil = Primary .001 (gauge set to 2k) and .9 (gauge set to 200)
Secondary 6.18 (gauge set to 20k)
2nd Coil = Primary .001 (gauge set to 2k) and .9 (gauge set to 200)
Secondary 6.08 (gauge set to 20k)
Just not quite sure the settings on the meter measuring across the primaries are correct.
Here are a few pics...
Thanks in advance for your help
Derek
Stock black Bosch coils (made in spain)
1st Coil = Primary .001 (gauge set to 2k) and .9 (gauge set to 200)
Secondary 6.18 (gauge set to 20k)
2nd Coil = Primary .001 (gauge set to 2k) and .9 (gauge set to 200)
Secondary 6.08 (gauge set to 20k)
Just not quite sure the settings on the meter measuring across the primaries are correct.
Here are a few pics...
Thanks in advance for your help
Derek