4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

engine rpms increase

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Old 10-20-2006, 10:37 AM
  #1  
jbodak
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Default engine rpms increase

I very recently had a 70mm throttlebody and plenum installed plus had it custom tuned with an SCT Excalibrator2. One thing that happens on an intermittant basis after the engine has warmed up is when I push in the clutch and my foot is off the gas pedal, the engine revs up to about 1800 - 1900 rpms. It drops right back down when I put it in gear or if I don't put it in gear right away, it'll drop down back to normal in a few seconds. Has anybody experienced this and if so, what was your resolution? As always, thanks for your feedback, it is always helpful.
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Old 10-20-2006, 02:23 PM
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eventer289
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Default RE: engine rpms increase

You might try resetting your ECU (unplug the battery for 20 min and then reconnect). I have a friend who put an intake on an 04 GTO w/o disconnection the battery, and he had the same problem. I think the computer may have to just recalibrate for the increased air flow. Try it and let us know if it works or not.
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Old 10-20-2006, 02:43 PM
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GodAmGT00
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Default RE: engine rpms increase

Or, if that doesn't do anything, check your TPS connection/adjustment if you can..

Or, check your Throttle cable isn't catching on anything...



JT
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Old 10-20-2006, 02:44 PM
  #4  
jbodak
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Default RE: engine rpms increase

Thanks for the suggestion. I'll try that this weekend. I am assuming that because there is a custom tune in the car's computer now (the stock tune is on my Excalibrator2 unit) the computer will reset to the custom tune. Am I assuming correctly? Can you tell I'm not a mechanic? I just want to make sure I don't screw up my car.
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Old 10-20-2006, 02:46 PM
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Default RE: engine rpms increase

I'll check those two suggestions also, they seem simple enough. Thanks.
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Old 10-20-2006, 02:56 PM
  #6  
boostedgt02
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Default RE: engine rpms increase

Also you might want to check the TPS voltage and set it to .98 just a suggestion.
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Old 10-23-2006, 11:38 AM
  #7  
jbodak
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Default RE: engine rpms increase

Hey Eventer289!

On Saturday morning, I tried your suggestion of disconnecting the battery for 20 minutes so the computer can reset itself. I did some driving Saturday and a ton of driving yesterday doing a bunch of errands plus the drive into work this morning and so far, I haven't had that problem. So far it seems to have worked. Thanks again and thank you to everyone who responded.
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