Advance spike at start up.
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Advance spike at start up.
Im getting a 31 degree (base included) advance on start up (log shows 31 degrees ar 75 RPM). Ive looked but cant seem to find any settings that would control it. All help is appreciated.
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48 Chev Pick Up, 455 Olds Motor, MSII V3, MSD Ign, TunerStudio MS, Emb Code V2.920, LC1 WB, VR with 36-1 Wheel
Re: Advance spike at start up.
I think i have the answer to my question-let me know if im wrong (wont be the first time)! I currently have my trigger offset at 31 degrees. Because MS uses this during the crank cycle or when comm is lost, this is why im getting a 31 degree "spike". To correct this problem i need to rerun trigger wizzard and reset the distributor to a more practical offset number say around 8 degrees! This MS system and all the work everyone has done on this is awsome! Thanks to all!
48 Chev Pick Up, 455 Olds Motor, MSII V3, MSD Ign, TunerStudio MS, Emb Code V2.920, LC1 WB, VR with 36-1 Wheel
Re: Advance spike at start up.
You are correct. There is an ignition setting called trigger rise such that, if this option is selected rather than 'Calculated', then when you are below cranking rpm, the ecu fires spark immediately whenever it gets a tach signal. Trigger offset tells the ecu where TDC is relative to the tach signal, so while you are cranking the ignition advance gauge shows trigger offset rather than the table advance. As soon as cranking is done, it switches to using and displaying the table advance.
But don't just change trigger offset, because it will also affect your post-cranking advance even though it will appear to be the same on the gauge. What you need to do is measure the timing with a light during stable idle and adjust the trigger offset until the timing light value matches the advance gauge.
But don't just change trigger offset, because it will also affect your post-cranking advance even though it will appear to be the same on the gauge. What you need to do is measure the timing with a light during stable idle and adjust the trigger offset until the timing light value matches the advance gauge.