tesna
25-11-2009, 03:09 AM
Hi,
A while ago I just replaced my engine mounts with polyurethane. But I had a little problem, the idle speed of my car sometimes is quite low (500rpm-ish), so the car vibrates when idle.
Yesterday I took the car to the workshop to check on the problem. I get the throttle body cleaned (including the stepper motor & TPS), adjust/calibrate the SAS/fixed SAS, adjust/calibrate the TPS, and checked for problem using MUT-II.
The car does not output any diagnostic code on the MUT-II, according to the technician everything are working fine, but the techie says there is a little problem on the EGR sensor or something, but he said it isn't a big deal.
The thing is, sometimes the engine's idle rpm drop to 500 rpm. (it also happened before I cleaned the throttle body). Then I just noticed it yesterday, only drops to 500rpm when I set to A/C to AUTO at 25 degrees, and when outside temp are not far from the inside temp. I guess when the compressor on, but the a/c fan off.
So, in summary:
idle when a/c off: 750 rpm (according to MUT)
idle when a/c set below than 23 degrees: 750 rpm (Slightly increased for a moment then drops back to 750 rpm) I guess ICSV kicks in early before a/c compressor turned on? A/C fan is spinning.
idle when a/c set at 25 degrees (A/C fan stopped, a/c compressor on?): 500 rpm.
The question is, is that normal? ICSV appears working fine. In the MUT-II I can see the values (stepper value?) changed when a/c turned on. But I confused why the ICSV did not compensate when a/c fan isn't spinning? I guess the compressor still running but without the a/c fan.
The techie says it's normal, and to compensate that I should set the a/c temp below than 23 degrees and use manual control of the fan. The thing is, it's not convenient, I enjoyed the ability of the a/c to automatically adjust everything. and 23 degrees is too cold for me. :uhoh2:
A while ago I just replaced my engine mounts with polyurethane. But I had a little problem, the idle speed of my car sometimes is quite low (500rpm-ish), so the car vibrates when idle.
Yesterday I took the car to the workshop to check on the problem. I get the throttle body cleaned (including the stepper motor & TPS), adjust/calibrate the SAS/fixed SAS, adjust/calibrate the TPS, and checked for problem using MUT-II.
The car does not output any diagnostic code on the MUT-II, according to the technician everything are working fine, but the techie says there is a little problem on the EGR sensor or something, but he said it isn't a big deal.
The thing is, sometimes the engine's idle rpm drop to 500 rpm. (it also happened before I cleaned the throttle body). Then I just noticed it yesterday, only drops to 500rpm when I set to A/C to AUTO at 25 degrees, and when outside temp are not far from the inside temp. I guess when the compressor on, but the a/c fan off.
So, in summary:
idle when a/c off: 750 rpm (according to MUT)
idle when a/c set below than 23 degrees: 750 rpm (Slightly increased for a moment then drops back to 750 rpm) I guess ICSV kicks in early before a/c compressor turned on? A/C fan is spinning.
idle when a/c set at 25 degrees (A/C fan stopped, a/c compressor on?): 500 rpm.
The question is, is that normal? ICSV appears working fine. In the MUT-II I can see the values (stepper value?) changed when a/c turned on. But I confused why the ICSV did not compensate when a/c fan isn't spinning? I guess the compressor still running but without the a/c fan.
The techie says it's normal, and to compensate that I should set the a/c temp below than 23 degrees and use manual control of the fan. The thing is, it's not convenient, I enjoyed the ability of the a/c to automatically adjust everything. and 23 degrees is too cold for me. :uhoh2: