MS-II V3.0 I have a problem with the IAC. It seems to stop responding to commands before the car is fully warmed up, leaving the idle too high. According to the MegaManual (http://www.megamanual.com/ms2/IAC.htm), there is a possible fix involving jumpering two resistors labeled 1R0. I can't seem to find these at all, maybe they're from the 2.2 board?
The MegaManual says "This is very likely to be the problem for those who see the proper step commands given in software but inconsistent response from the motor, such as requiring a restart to lower the hot rpm after a cold start." This exactly describes my problem, but I can't figure out what to jumper. Anyone with a V3.0 have any luck figuring out how to do this mod?
IAC Problem: Idle too high until restart
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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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BottleFed70
- MegaSquirt Newbie
- Posts: 31
- Joined: Fri Jun 24, 2005 2:22 pm
Re: IAC Problem: Idle too high until restart
What version of the firmware do you have?
Older versions of the firmware have a bug that will produce the exact same problem that you describe.
Older versions of the firmware have a bug that will produce the exact same problem that you describe.
1970 Ford Mustang
351W Single T70 Turbo 6 PSI
MSII, v3.0 PCB, v2.889 firmware, Megatune 2.25
351W Single T70 Turbo 6 PSI
MSII, v3.0 PCB, v2.889 firmware, Megatune 2.25
Re: IAC Problem: Idle too high until restart
Thanks for the advice, I think I finally figured it out. I had a bad IAC, I replaced it and everything seems good now.