Recent content by a.round

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    Thunderbolt V doesn’t advance timing

    Thanks for the replies. It looks like I am getting some advance now. Not really sure what has changed. I am still not convinced that it is advancing correctly. It seems like the advance comes in much later than it should. I don’t get to 30* until about 4000 rpm. That is with me trying to hold...
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    Thunderbolt V doesn’t advance timing

    I am planning on working on the audio warning system tonight. This model does not have the knock sensor. This is one of the early TB V systems without the KS. Just trying to see if there is something I can do before I replace the entire TB system.
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    Thunderbolt V doesn’t advance timing

    I have also read that the high temp alarm system will cause the ICM to not advance the timing. My engine is not running hot but the alarm buzzer doesn't work anymore. Has anyone else heard of this? Is there a way to check this system?
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    Thunderbolt V doesn’t advance timing

    Thank you for the reply. I thought about the ignition sensor inside the distributor, but if it wasn’t working wouldn’t that make it not run at all?
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    Thunderbolt V doesn’t advance timing

    I have a 2002 Caravelle 209 BR with a 5.7 vortec and the TB V ignition (without the knock sensor). My problem is that the ICM only advances timing about 6-7*. I set the base timing (by grounding purple/white wire) at 10* and then re-checked advance out of base timing mode. Total timing at...
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