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red924 · Joined: 13 Oct 2003 Posts: 281 Location: London, England

As above really, I checked to see whether there was a spark or not, I want to find out for definate before I buy a new one! Its the later bosch coil by the way.

Thanks

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1980 Red 924 CARRERA GT(rep) with custom leather interior + GT goodies!
Click on link 4 pics! http://www.924board.org/viewtopic.php?t=12422

1982Porsche924 · Joined: 14 Nov 2002 Posts: 679 Location: Cupertino, CA

Check continuity between the + and - terminals. Should be about 100 ohms. Check between + and top of coil. Should be closer to 10,000.

or was it - and top of coil = 10,000?
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1979 Porsche 924 "S"
Engine: Euro pistons, Light Flywheel, Weber TB, Bursch Header, Cam Wheel
Suspension: Front coil-overs, adj sways, Solid bush. Thicker tors. bars, 5-bolt, BBS rims
Body: Fiberglass widebody kit, 931 Nose

Sleykin · Posted: Fri Jul 30, 2004 10:54 am Post subject:

There is really no way to be definate about it. You can check primary and secondary resistance against the specs, but since it is an autotransformer with a single winding there is no practicle way to determine the state of the internal insulation. Thermal faults my not show up under most test situations. The high voltage output is a function of the inductance and capacitance in the circuit and the time of the pulses applied. Even using a test set for testing coils is not 100%.
On the practical if the DC resistance is within spec it should be ok.
...
Sorry about the EBS I must be in a bad mood

_________________
Glenn Neff
Medford, OR
87' 924S

red924 · Joined: 13 Oct 2003 Posts: 281 Location: London, England

cheers guys a new one is an expensive way to find out

_________________
1980 Red 924 CARRERA GT(rep) with custom leather interior + GT goodies!
Click on link 4 pics! http://www.924board.org/viewtopic.php?t=12422

garthfan · Joined: 28 Feb 2004 Posts: 226 Location: Manchester, NH

Lick your finger and touch the output while a friend turns the key....

_________________
1987 924S - Was a daily driver...now it's GONE! *sniff*
1986 944 N/A Guards Red
1996 VW Jetta Grocery-Getter
1995 Saab 900S Winter-Driving-Feeling-of-Security-Vehicle

garthfan · Joined: 28 Feb 2004 Posts: 226 Location: Manchester, NH

...okay, before I get flamed by certain know-it-alls about giving dangerous information to inexperienced people...it was a joke.

_________________
1987 924S - Was a daily driver...now it's GONE! *sniff*
1986 944 N/A Guards Red
1996 VW Jetta Grocery-Getter
1995 Saab 900S Winter-Driving-Feeling-of-Security-Vehicle

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

Coils seldom go bad.

Are you sure that you are having a spark problem?

Have you tried holding a spark plug lead with an extra spark plug close to achassis ground wile cranking the engine to see what the spark looks like?

If you get no spark, and you have voltage at the coil, you need to check the magnetic pickup module inside of the distributor to see if it is working, before you assume that the coil is the problem.