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Old 12-26-2011, 08:20 PM   #1
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Default No spark. Bad CAS or Coil Pack?

Hello I am running a 95 miata with a MSPNP and turbo set up in sig.

Besides the fact that i had to work on christmas my car died yesterday too. After i pulled out of a side street onto a main road i gave the car some throttle to keep up with traffic. The car began to fish tail, then have some moderate wheel hop. This was under light load; the RS3's just hate the cold weather. The next thing I know, the car dies and i pull over. The car would not start and has not. The fuel pump primes, and I can smell raw fuel when trying to turn it over. I can also connect my computer to the MSPNP without a problem. One thing i noticed, which I am not sure actually means anything or not, is that the pulse width gauge does not move at all. is this normal when cranking, or is this telling me that the CAS or coil pack is bad?

I then took the spark plug wires out and connected a spark plug to each wire outside the head to see if i was getting spark. The result was the same on all wires: One initial spark when trying to first crank and then no more spark.

Are there any tests I can perform to narrow down whether or not it is the coil pack, CAS, or something else. As I understand, if the CAS is bad then it will not tell the car when to spark. I will look closer tomorrow to see if it is as simple as some connector that popped lose and is not making good contact, but I doubt this is the case considering it sparks once at first and then no more.

I am attaching a log of it trying to crank over.
Attached Files
File Type: msl starting problem.msl (293.6 KB, 80 views)
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Old 12-26-2011, 08:26 PM   #2
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I'd be willing to bet your CAS is the culprit.
I had almost identical symptoms, and a new crank sensor brought the car back to life.
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Old 12-26-2011, 08:32 PM   #3
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too bad a new CAS is like 250-300$ ugh. i hate this car
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Old 12-26-2011, 09:24 PM   #4
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get a used one for 40-50$?
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Old 12-26-2011, 09:47 PM   #5
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I would rather not buy a CAS and find out it was the coils. Is there a way to test the CAS to see if it is working properly?
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Old 12-30-2011, 07:04 PM   #6
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Fixed the problem. Ended up looking closer at the CAS and it was completly knocked out of the head. Put it back in and reset the timing. All is well
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