M/T rpm doesn't drop enough when shifting

Reply Subscribe

Thread Tools

Search this Thread

#21

04-16-2013, 02:48 PM

Steve244

Member

Join Date: Aug 2009

Location: Georgia

Posts: 3,661

Quote:

Originally Posted by DavefromCA

I purchased a 04 Mach1 mustang that was also a stick and I had the same complaint. I learned to live with it however here is the Mach 1s procedure for fixing the issue. No clue if this would work on the Fit but it appears that it has to do with the IAB valve.

Hanging/Slow dropping RPM FIX inside. - 2003-04 Mach 1 Registry Owners Club

Fit's don't have an Idle Air Control valve (IAC) with drive-by-wire and using the throttle plate to control idle. So, no, this mod doesn't apply here.

The only way would be to reprogram the Fit's ECU removing the logic that creates the throttle hang. This has been done for older generation Fits but not ours. And it will fail emissions tests in major metro areas and the state of CA (not to mention void your warranty).