Xyi

Hey all,

I just purchased a 2007 IS250 AWD a couple months ago. The problem I'm having is that 100% of the time I let off the gas pedal, the RPM will drop around 500-700 and I'll feel a sudden "jerk" in the car. It will only drop for a second and then RPMs will go back up to where it was before the drop. It's started to get cold here, so I'm not sure if that has anything to do with it. I've only started to notice the issue recently, but ever since I've discovered it, I can feel/notice it every time. The car only has 65k miles on it. I'm wondering if anyone knows how I can fix this or if anyone has dealt with this before. If I can't find a fix then I might have to go to the stealership next week.

jasonr

If you are talking about idling then its normal. average idle is around 650 rpm. Every time your radiator fans kicks in or any other electronic load on the battery will cause that. Sudden minor/major electric load will cause rpm go up and down.

Xyi

No, I'm talking about when I'm driving and let off the gas because I've reached the desired speed, the RPM will drop by 500-700 for a second and then jump back to the same RPM before the drop. It happens 100% of the time.

viperrx

car shifting down to a lower gear

Xyi

It's not shifting to a lower gear either, I've checked by keeping my display on current gear and it stays the same every time.

jonathanz

iTrader: (2)

was your car completely warm?

06350F

iTrader: (4)

Random idea, my car kinda dose that turns out one of the rear calipers is getting stuck. Turns out it's more common then I had known. Makes sense, how's the brakes

FSportIS

iTrader: (13)

I had the rear calipers stuck on the IS350 in which I have just replaced them but I don't notice this problem. To OP, can you please record it on youtube so we can see what that really is. I never see an issue like that before.

Xyi

I'll try and get a video of it up tomorrow

FSportIS

iTrader: (13)

I suspect that it is misfire or something. Do you get any warning light on the dash or any computer code error if you have the reader?

Xyi

Nope, I'm not getting any errors on the dash. I'll see if I have time to get a recording of it later when I wake up or tomorrow.

08is350x

My car does the same thing but goes away when it's fully warm. I think it's normal

Xyi

Today was in the 50s and it didn't happen the entire time I was driving. So it seems like it might be something that only happens when it's cold. From the research I've been doing people say this happens to theirs when it's cold out as well. I guess it just doesn't seem "normal" to me.

Gville350

iTrader: (10)

So I was in Nebraska about a week ago; those -15 wind chills are a killer!

WNYX

Xyi, I don't know if this is any peace of mind, but mine does this as well. I was so worried when I first noticed it, but I noticed it didn't happen if the temperature was warmer than 35. None of my other cars did this, so I'm still not used to it.