LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Code 41 Electronic Spark Timing Open??? Huh?

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Old Nov 18, 2008 | 06:25 PM
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Default Code 41 Electronic Spark Timing Open??? Huh?

Ok I got this error and I have no idea what to make of it. Anyone mind shedding some light here?

Is this the Opti reporting this, did I advance my timing to far? Or is it something else?
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Old Nov 18, 2008 | 07:36 PM
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Check your Opti harness maybe. I flipped through both the Haynes and Chiltons, it has to do with the distributor circuit. Both books list it as a open or short in the distributor circuit.

Also maybe get the ICM and your coil tested, the error code isn't very specific, its just DI circuit, anything ignition related falls under this.

Is it running weird or anything?
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Old Nov 18, 2008 | 07:45 PM
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It bogged, hesitated stalled and reused to start twice then started right up and was fine and repeated...

I went ahead and put the MSD Opti back to the stock 2 turns and replaced the maf with another and it seems fine... I did not drive it yet.

I am thinking maybe the timing was to advanced but I can not be sure. I have a spare ICM I will go test it in a little while when I go for food. I am not sure its that but never hurts to check.
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Old Nov 18, 2008 | 11:43 PM
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code 41 is from the ICM or the white "EST" wire feeding it.

Bob
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Old Nov 18, 2008 | 11:47 PM
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Hmm it tested fine... and now that I put the timing on the MSD back to stock as well as swapped the MAF the car actually seems to be running a lot better... I am getting on the dyno tomorrow and having the car tested... guess we shall see tomorrow.
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