Jeep liberty rpms

[Krl]

I have an 08 jeep liberty 4x4, i feel like its running low on the rpms

At stop light: 400
In park: 500
55 mph: 1500
60 mph: 1650

The other day i had it jacked up as i was changing the front driver brakes, i started it to pump the brakes a few times and it started to run really low the rpms were at like 250-300 and i thought it would stall so i turned it off, put the tire on, lowered it, drove it some and let it sit in park for 20 minutes and nothing.

 

[tommudd]

I have an 08 jeep liberty 4x4, i feel like its running low on the rpms

At stop light: 400
In park: 500
55 mph: 1500
60 mph: 1650

The other day i had it jacked up as i was changing the front driver brakes, i started it to pump the brakes a few times and it started to run really low the rpms were at like 250-300 and i thought it would stall so i turned it off, put the tire on, lowered it, drove it some and let it sit in park for 20 minutes and nothing.

Never driven a KK ( 08-12) that much to notice really.
All of mine ( 03,04 and 05 ) idle about 450 -500 at lights
500-550 or so ( I THINK) when idling
as far as RPM on the highway it depends on tire size / etc what the RPM is so most would be different
I never pay any attention really to RPMs , I know what they are suppose to sound like when idling etc so never really look

 

[Conundrum2006]

I think it's supposed to idle in drive at 550, my 06 XK is closer to 500 when warm. It does a weird stalling trick goes down to 300-400 rpm then back to normal . A lot of 3.7 and 4.7 owners experience this, might be CPS might not. For me I know it's based on the electrical load, ac, fan on high, headlights on and kids using the outlet for DVD players. But I do have a after market cam sensor I'm going to swap out. Almost always go with mopar but it was Sunday and there wasn't time wait on getting the new engine running.

I think the 08is electronic throttle so no IAC to replace.

The low rpm might have been do to pumping the breaks or electrical reading. It should have corrected itself After a time.
But I've had weird start ups in several newer cars that seem to run rough or oddly when first turned on, restart and all the systems are fine.


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