Rough Idle in Drive or Reverse (not Park or Neutral)
#1
Rough Idle in Drive or Reverse (not Park or Neutral)
Hey guys,
Just got my car back from the shop & replaced valve cover and upper plenum gaskets, plugs, pcv, and had intake path cleaned. Car now idles rough when stopped, but only when the transmission is engaged. Engine stutters and RPMs jump in response to stuttering (between 800-650 RPM). This goes away when placed in Park or Neutral, does anyone have any suggestion or experienced this before? Thanks.
Just got my car back from the shop & replaced valve cover and upper plenum gaskets, plugs, pcv, and had intake path cleaned. Car now idles rough when stopped, but only when the transmission is engaged. Engine stutters and RPMs jump in response to stuttering (between 800-650 RPM). This goes away when placed in Park or Neutral, does anyone have any suggestion or experienced this before? Thanks.
![Confused](https://maxima.org/forums/images/smilies/confused.gif)
Last edited by turbolaw99; 03-03-2008 at 09:12 AM.
#4
#5
I am going to try cleaning it again and then see what the result is, but could there be any other culprit? Does a bad coil pack demonstrate similar behavior? Thanks for the replies.
#6
OK, doing a search outside of the ORG, I found that others experiencing this issue after cleaning the IACV replaced the Throttle Position Sensor (TPS) to solve this problem. Anyone already replaced their TPS? Thanks.
#7
Just following up, but has anyone replaced their TPS and what were the results? I am still experiencing a rough idle after cleaning the IACV. The TPS is ordered but I am awaiting delivery. Thanks.
#8
having same issues
Yo turbolaw99, I'm having the exact same problems as you. My car revs at about 700-900 in park/neutral, but only at about 550 and sometimes lower when in gear. It feels like there's a slight chugging at low speeds, but nothing noticeable at higher speeds. I've been told that the TPS is to blame, so I'm thinking about swapping that out. Can you tell me if the TPS fix worked for you? It would really help me out.
#10
I've been trying to hunt down the exact problem that shorterchild has described. I've changed all the items that would have anything to do with this problem. That includes IACV/TB cleaning with fresh gaskets, injector cleaning, and swapped coils that came from a maxi with 50k miles. The ONLY thing that hasn't been changed is the TPS, but i'm afraid to touch it because the bolts that hold it are stripped & rusted.
![Frown](https://maxima.org/forums/images/smilies/frown.gif)
#12
My car has a bit of a rough idle in D, 2 and 1. It "feels" like the torque converter is engaging too early as its highly eager to get off the line with no acceleration. It idles nicely at ~750 rpm but when it revs, its smooth as.
I checked all my coil packs - all of them were fine. IACV is fine. TPS has been replaced.
I suspect engine mounts are worn and its just excess vibration.
I checked all my coil packs - all of them were fine. IACV is fine. TPS has been replaced.
I suspect engine mounts are worn and its just excess vibration.
#13
Thanks for the tip, AndrewR. But, i replaced that too.
I did everything in the sticky's (and then some).
Jordanalley might be right about the motor mounts. Especially me being a GLE with that electronic front engine mount.
![Smilie](https://maxima.org/forums/images/smilies/smile.gif)
Jordanalley might be right about the motor mounts. Especially me being a GLE with that electronic front engine mount.
#14
Hey guys,
Just got my car back from the shop & replaced valve cover and upper plenum gaskets, plugs, pcv, and had intake path cleaned. Car now idles rough when stopped, but only when the transmission is engaged. Engine stutters and RPMs jump in response to stuttering (between 800-650 RPM). This goes away when placed in Park or Neutral, does anyone have any suggestion or experienced this before? Thanks.![Confused](https://maxima.org/forums/images/smilies/confused.gif)
Just got my car back from the shop & replaced valve cover and upper plenum gaskets, plugs, pcv, and had intake path cleaned. Car now idles rough when stopped, but only when the transmission is engaged. Engine stutters and RPMs jump in response to stuttering (between 800-650 RPM). This goes away when placed in Park or Neutral, does anyone have any suggestion or experienced this before? Thanks.
![Confused](https://maxima.org/forums/images/smilies/confused.gif)
1. Make sure the ignition is good. Swap between the two engines to make sure it is not a ignition coil.
2. If it is indeed not a ignition coil, then just unplug the ignition coil which you suspect as a misfired and listen very careful to hear any different with plug and unplug the suspected misfired engine.
3. If it is indeed a different, it might be the fuel injector. NOTE: Please please buy a remanfacture "NOT SALVAGE" from ebay...or junk yard.
4. Good Luck....follow the instruction at YOUR OWN RISK.
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