Idle down slow in neutral and park
#1
Idle down slow in neutral and park
So I took off the resonator and wanted to hear the hemi. It revs up fairly quick but when u let off it idles down really slow. My question is why and how they (dodge) did this? Does it give less engine braking? Is that why our 390hp motors get more mpg than previous hemi trucks?
Last edited by Tooljake; 05-04-2009 at 12:36 PM. Reason: Neutral is spelled wrong
#2
So I took off the resonator and wanted to hear the hemi. It revs up fairly quick but when u let off it idles down really slow. My question is why and how they (dodge) did this? Does it give less engine braking? Is that why our 390hp motors get more mpg than previous hemi trucks?
We get better mileage because of VVT/VCT and the MDS.
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#7
Idle...welcome to throttle by wire.
Step on the gas pedal and send a signal to the ECU.
ECU decides its best to idle down slow because of....whatever...
Also in play is the tranny. You have a slipping type of torque conveter.
and call it what you want, you know what I am talking about when I type ECU...
PCM
ECM
Engine control unit or module, or power control module
Step on the gas pedal and send a signal to the ECU.
ECU decides its best to idle down slow because of....whatever...
Also in play is the tranny. You have a slipping type of torque conveter.
and call it what you want, you know what I am talking about when I type ECU...
PCM
ECM
Engine control unit or module, or power control module
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#9
My 4.7 does this also. Rev it and it idles down slow. I would guess engine management on this. I have owned other drive by wire vehicles and they did not rev like this. My Subaru Forester was similar to this but I read that it was programmed that way to keep the rpm's up when shifting gears. Mine was a manual. I don't see where this idea would fit in with the Ram.