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-   -   RPM moving (http://www.ptcruiserlinks.com/forum/showthread.php?t=59665)

Pippov 20 Apr 2016 04:49 am

RPM moving
 
When I got to the stop , I find that RPM vary widely.
It s the same when the engine is cold or warm.
they oscillate between 690 and 760 rpm , creating small accouts .
Is there a way to set the slowing down? Or it can come from elsewhere ?

Pippov 20 Apr 2016 05:10 am

Re: RPM moving
 
[youtube]QsXhvm37Yuo[/youtube]

from 0,44 sec you see the gap

quicksilverdon 20 Apr 2016 07:14 am

Re: RPM moving
 
Do you have air conditioning on? It also comes on when you have defrost on.
If the airconditioner cycles, it impacts the engine RPM.

Pippov 20 Apr 2016 07:22 am

Re: RPM moving
 
No A/C and No defrost

chuzz 20 Apr 2016 03:25 pm

Re: RPM moving
 
I'd be looking for a vacuum leak.

2step 21 Apr 2016 09:49 am

Re: RPM moving
 
I do see the one little drop in RPM at 44sec but the rest of the small changes of 10 RPM or less seems normal to me. A vac leak would send the RPM up fairly high and I don't see that. What I do see is a short drag on the engine like maybe the alternator or other accessory momentarily shifting modes. Even worn torque strut bushings could cause that. I'm not sure if I could actually hear the engine slow in the video.

At this point, I wouldn't worry too much about it unless it is a chronic problem all the time, cold engine right after start up, warm engine waiting at a stop light, in gear, in neutral, etc.

NitroPT 21 Apr 2016 09:52 am

Re: RPM moving
 
Time to clean intake system parts. IAC would be my first choice to examine and clean.

Pippov 21 Apr 2016 10:00 am

Re: RPM moving
 
Quote:

Originally Posted by 2step (Post 607218)
I do see the one little drop in RPM at 44sec but the rest of the small changes of 10 RPM or less seems normal to me. A vac leak would send the RPM up fairly high and I don't see that. What I do see is a short drag on the engine like maybe the alternator or other accessory momentarily shifting modes. Even worn torque strut bushings could cause that. I'm not sure if I could actually hear the engine slow in the video.

At this point, I wouldn't worry too much about it unless it is a chronic problem all the time, cold engine right after start up, warm engine waiting at a stop light, in gear, in neutral, etc.

It s a chronic problem, it comes in all different time when the car doesn't run, cold engine warm engine there is no difference .

Pippov 21 Apr 2016 10:02 am

Re: RPM moving
 
Quote:

Originally Posted by NitroPT (Post 607219)
Time to clean intake system parts. IAC would be my first choice to examine and clean.

You talking Air intake system parts ?
My Air intake system is new and it s the same as before I change it

NitroPT 21 Apr 2016 10:14 am

Re: RPM moving
 
Quote:

Originally Posted by Pippov (Post 607222)
You talking Air intake system parts ?
My Air intake system is new and it s the same as before I change it

I recommend to Examine the parts anyway.


Mostly check and clean yourr IAC or specifically called IACV. Idle Air Control Valve


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