First off, I'm new to this and am getting very overwhelmed.
I bought a ms2357-c assembled ms-II V3.57 WITH Ford TFI mod and a 12' harness we made ourselves. If I turn on the ignition and check the map pressure it shows 94.2( I'm at 2k foot elevation) if I hook up a vacuum pump/gauge to it it reads correctly and seems fairly accurate. However once u turn on the motor the pressure drops to 42kpa and doesn't move, no matter if u give it gas, disconnect the hose, try putting the vacuum pump back on. Nothing changes map reading other then stalling the motor. If the motor drops below 500rpms it will read the map for a second then freeze up and stop moving again until it drops below 500rpm or the key is turned off then back on.
At first we thought it was just a sticky map sensor but To complicate things. I also have a msII that is a plug and play style with the small adaptor harness to go to the stock mustang wiring. If I put the new computer into the old truck it works fine. No MAP issues. if I put the old plug and play computer in this new truck the map sensor reads correctly BUT it won't advance the timing. (not even trigger offset) so it seems either computer can run my plug and play wiring harness but neither work on the new truck but they don't work in different ways. How is this possible ?
MAP sensor issues.
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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).
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.
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Bernard Fife
- Master Squirter
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Re: MAP sensor issues.
What code version? Do you have an MSQ and a datalog?
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Simon5ay5
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Re: MAP sensor issues.
I don't know what code version it has, how do I find that I would assume its the newest I just bought it from DIY a few weeks ago? The msq I'm using was pulled off the DIY website for a 93 5.0 mustang . I've tried to make a datalog I don't know if it worked though, I don't have Excel so my computer couldn't open the file once it made it.