I've had a mysterious problem with a perfectly running tune. I haven't been able to solve this problem on my own for over three years now. The cars runs perfect 50% of the time. When it decides to run perfect it will run perfect for hours. But then sometimes it doesn't (can't detect the pattern). Sometimes when I drive and let it sit for an hour...and the engine will cut out under load in 1st and second gear around 2500 to 4000RPMs for a moment and then starts back up.
The datalog shows that my RPMs are spiking then go to zero.
Some facts about my setup
Car is a 1978 280z Stroker with Low Z injectors (with 6 ohm dropping resisters)
MS 2.2 with 3.0 board (flyback capability connected) with relay board installed.
daughter board installed...only controlling fuel at this point.
Using an ignition module from a 79ZX.
Brand new cap/rotor/wires and plugs.
Grounds are all solid and clean connection running to the engine, batt neg terminal and body is ground to the batt neg term.
Coil has the stock noise capacitor connected
Tach is coming off of the neg coil and is shielded with braided wire and the shielding is ground off.
Attached is the datalog.
thanks for your help
Corey
Mysterious Intermittent Engine Cut out
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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.
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The full forum rules are here: Forum Rules, be sure to read them all regularly.
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.
Mysterious Intermittent Engine Cut out
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Matt Cramer
- Super Squirter
- Posts: 2951
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Re: Mysterious Intermittent Engine Cut out
What exactly is controlling the spark?
Re: Mysterious Intermittent Engine Cut out
The 79ZX ignition module is controlling the spark.
But I think I found the problem. I went through the installation step by step and compared it to the board and found that my board was setup for the Hall/Opto sensor and not the neg coil. (C30 was not installed, D1 was jumpered, D2 was jumpered, C12 was not installed). Lucky for me I ordered those parts years ago and was able to solder them up tonight. I just took it out and it ran smooth. Time will tell...
But I think I found the problem. I went through the installation step by step and compared it to the board and found that my board was setup for the Hall/Opto sensor and not the neg coil. (C30 was not installed, D1 was jumpered, D2 was jumpered, C12 was not installed). Lucky for me I ordered those parts years ago and was able to solder them up tonight. I just took it out and it ran smooth. Time will tell...