Coasting at Highway speed..

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#11

04-05-2012, 08:20 AM

drtom

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Join Date: Aug 2009

Posts: 2,652

did not change the TC oil

the lockup tc were talking about is of course the torque converter,part of the transmission.
that would be tranny fluid huh.

not to be confused with tc/transfer case huh

#12

04-05-2012, 10:22 AM

ElGuapo

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Join Date: Feb 2011

Posts: 95

Quote:

Originally Posted by Widespread Hummer

No El Guapo, the RPM's drop slowly.

Thank you, so I guess it's normal.

#13

04-05-2012, 10:24 AM

ElGuapo

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Join Date: Feb 2011

Posts: 95

Quote:

Originally Posted by drtom

the lockup tc were talking about is of course the torque converter,part of the transmission.
that would be tranny fluid huh.

not to be confused with tc/transfer case huh

palm to face... you know, I knew that about the torq conv. not sure why i got the tras case in my head... maybe i just feel guilty for not changing the oil in it and it's eating at me from the inside.

#14

04-05-2012, 05:27 PM

CHP

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Join Date: Apr 2011

Posts: 51

Quote:

Originally Posted by ElGuapo

noticed this week that at highway speeds when I let off the gas pedal my h3 will not coast as smoothly as it did. I acts as a engine brake. At lower speeds, I do see the rpms pick up and go back to about 800rpm until i get up to about 35 or 40 mph, then the rpm needle will stay at bout 1500 at 45-50mph and 2400 at 70mph and will slowly climb down but I can still feel the engine braking my rig.

is this normal? I just started to noticing this so not sure if i'm just being more sensitive to the fact.

Your torque converter unlocks at 38.5 MPH in 4th gear when you are off the throttle. The engine braking you are feeling is due to the DFCO (deceleration fuel cut off). DFCO shuts your engine off by essentially cutting fuel causing your engine to be back driven from your movement through your drivetrain. DFCO is enabled at 49.7 MPH in 4th gear and is disabled when your speed drops below 38.5 MPH. The braking is the compression of your engine slowing you down.