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Join Date: May 2000
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How do I test the ignition coil

I'm trying to test the ignition coil in my '87 944S. According to Haynes which is for the 8 valve 944 it says to test the resistance between the to two primary terminals and I should get between 4-6 ohms. I'm only getting 1.1 ohms. This seems very low and perhaps it's the reason my car hesitates. Then again would the coil even be working at all if the resistance is only 1.1?
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2000 Boxster S
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'78 928 w/ 13K miles (5 speed)
'75 914 2.0
Old 08-04-2004, 06:35 AM
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Are you sure your meter is accurate down to that level? Have you got a known good coil (Or a friends to compare it with)?
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Misty
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Old 08-04-2004, 07:10 AM
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There is an interface between the DME and the coil called an ignition module or ignition trigger box. These have been known to go bad. Tend to become temp sensitive. I wouldn't use the Haynes manual on the injection as this is primarially for the early 944's.

An intermintent hall sensor can cause problems too. As well as a loose connector to the single speed/reference sensor. Or a bad knock sensor.

If you have a friendly dealer near by you might beable to get a copy of the critical pages out of the DME testing procedure for your 'S'. Or even order the booklet.
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Old 08-04-2004, 08:06 AM
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Thanks SoCal, I'll check that stuff out.
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2000 Boxster S
'73.5 911T
'87 944S
'78 928 w/ 13K miles (5 speed)
'75 914 2.0
Old 08-04-2004, 08:51 AM
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