View Full Version : DIY on testing OEM coils


turborx8
05-25-2008, 11:36 PM
I have a voltage meter and I would like to make sure my OEM coils are perfect.

Here is the procedure I found in the service manual but what settings do I set my voltage meter at?

http://www.turborx8.ca/pictures/ignition.jpg

Easy_E1
05-25-2008, 11:40 PM
I tried the "Search" function and came up with this,,

http://www.rx8club.com/showthread.php?t=89515&highlight=coil+testing

Doesn't mean that the coils could not be failing during high rpm operation.

mysql
05-25-2008, 11:41 PM
it's really a crap shoot with the oem coils.

That's why I ended up just replacing them once a year.

xsnipersgox
05-26-2008, 12:00 AM
u would set it on resistance, the omega looking thing. as low as possible on the range for the test on no resistance (basically testing that the lines are touching).. on the million/OL. you are testing that the 2 terminals are not touching. i doubt this will be everything for a coil, but it's really the only "test" that can be quantified.

turborx8
05-26-2008, 12:11 AM
u would set it on resistance, the omega looking thing. as low as possible on the range for the test on no resistance (basically testing that the lines are touching).. on the million/OL. you are testing that the 2 terminals are not touching. i doubt this will be everything for a coil, but it's really the only "test" that can be quantified.

I did that and I keep getting a reading of 1.

I switched the setting to "->+" and I got the following readings on termials A/B

Coil #1 - 507
Coil #2 - 512
Coil #3 - 504
Coil #4 - 509

I switched the setting to "->+" and I got the following readings on termials C/B

Coil #1 - 429
Coil #2 - 427
Coil #3 - 428
Coil #4 - 430

I got the following readings on termials C/A

Coil #1 - 504
Coil #2 - 509
Coil #3 - 509
Coil #4 - 506

nycgps
05-26-2008, 12:11 AM
Just replace it every 20K miles or so. Not that expensive. consider the gas prices now, for the price of 2 fillups u get a brand new set of coils

turborx8
05-26-2008, 12:31 AM
Just replace it every 20K miles or so. Not that expensive. consider the gas prices now, for the price of 2 fillups u get a brand new set of coils

Not if you live in Canada.

The local dealerships here charge insane prices.

nycgps
05-26-2008, 12:35 AM
really ? how much do they charge ?

if its really too much, u can ask around and see if someone willing to do the *shipping* work for u :) (me, for example)

Jon316G
05-26-2008, 12:51 AM
The ">+" symbol is for testing diodes... use the symbol that looks like a "horse shoe" which is the symbol for Ohms that you will use to measure resistance.
Basically... you want the multimeter to show resistance... this will tell you that there isn't a short within the coil. Here is what I measured when I pulled my coils:
Terminals A/B measured 1.6 - 1.7K
Terminals C/B and C/A measured 2.5 - 2.6M.

turborx8
05-26-2008, 12:57 AM
The ">+" symbol is for testing diodes... use the symbol that looks like a "horse shoe" which is the symbol for Ohms that you will use to measure resistance.
Basically... you want the multimeter to show resistance... this will tell you that there isn't a short within the coil. Here is what I measured when I pulled my coils:
Terminals A/B measured 1.6 - 1.7K
Terminals C/B and C/A measured 2.5 - 2.6M.

I have multiple ohm settings on my meter.

2000 K
200 K
20 K
2000
200

I set the meter to 20k and I got the following readings on terminal A/B

Coil #1 - 1.53
Coil #2 - 1.58
Coil #3 - 1.56
Coil #4 - 1.57

I can't get a reading with C/B and C/A wiht my meter set to 20k ohm. It just displays "1"

Jon316G
05-26-2008, 01:05 AM
You got a 1 displayed because you were trying to measure resistance that was ~2.5M with the meter set to 20k.
You need a meter that can measure more than 2M ohms
FYI... 2000k = 2MB ohms

turborx8
05-26-2008, 01:16 AM
You got a 1 displayed because you were trying to measure resistance that was ~2.5M with the meter set to 20k.
You need a meter that can measure more than 2M ohms

Now I understand. :)

Thanks man!!

turborx8
05-26-2008, 11:50 AM
really ? how much do they charge ?

if its really too much, u can ask around and see if someone willing to do the *shipping* work for u :) (me, for example)

I called two local dealerships and they both had the same price.

$101.12 each :banghead:

kersh4w
05-27-2008, 11:34 AM
http://finishlineperformance.com/store/product.php?productid=16704&cat=338&page=1

$26

i dont see why they wouldnt ship to canada. PM me if they dont, i'll help you out. :)

nycgps
05-27-2008, 12:13 PM
I called two local dealerships and they both had the same price.

$101.12 each :banghead:

ROFL ?! 101.12 EACH in CAD ????????!?!?!?!?!?!?!?!?!?!

If tommy or jason cant do canadian shipment, I can freaking get it for you. pay me the cost /w shipping and thats it. u can actually buy a few more sets cuz u will need it in the future anyway.

kevinD1226
05-27-2008, 07:43 PM
wow u can get the ignition solution for just a little more

Jon316G
05-27-2008, 08:48 PM
wow u can get the ignition solution for just a little more

I just noticed that he (turborx8) has the MazSport Ignition Solution listed in his bio (or whatever you call that field at the bottom) :uhh:
Were you just curious if the stock coils were bad?