Car Alternator or Battery Issue

^pomen_GTR^

7,000 RPM
Senior Member
May 13, 2010
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Bro, he has idle issues. Alternator not supplying enough during idle. Like I said earlier, if alternator consistently undercharging, the battery simply goes flat very soon

simply need to drive faster :rofl: :driver:
 

^pomen_GTR^

7,000 RPM
Senior Member
May 13, 2010
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sweelt

2,000 RPM
Nov 6, 2016
2,306
248
663
Penang
my wira cruising like 13.5V with aircon ON or OFF.
When idle, aircon compressor kick in it drop to 13.0V (rpm also drop) for short moment then regain 13.5V normal idle 900rpm.
May i ask , is it aircon compressor problem or "berat" ? Idle rpm take a dive to 600rpm momentarily.
 

parakey

1,000 RPM
Senior Member
Apr 30, 2012
1,367
226
663
Kuala Lumpur
my wira cruising like 13.5V with aircon ON or OFF.
When idle, aircon compressor kick in it drop to 13.0V (rpm also drop) for short moment then regain 13.5V normal idle 900rpm.
May i ask , is it aircon compressor problem or "berat" ? Idle rpm take a dive to 600rpm momentarily.
A car at idle is not at it's most powerful rpm. So when compressor kicks in, it places an additional load to the resting engine. Hence rpm drops momentarily till ISC takes effect and raises the rpm to compensate
 

vr2turbo

Beyond 20,000 RPM!
Helmet Clan
Moderator
May 11, 2010
29,998
8,385
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Petaling Jaya
my wira cruising like 13.5V with aircon ON or OFF.
When idle, aircon compressor kick in it drop to 13.0V (rpm also drop) for short moment then regain 13.5V normal idle 900rpm.
May i ask , is it aircon compressor problem or "berat" ? Idle rpm take a dive to 600rpm momentarily.
Yes, due to extra force required to turn the compressor, that is hwy need the FICD/IACV to increase the idling speed......
 

Mitevo7

1,000 RPM
Senior Member
Thread starter
Jan 14, 2008
1,456
179
3,163
Hi All,

Since sweelt talked about A/C, just want to check, if alternator has not enough juice, will that affect the timing of A/C compressor kicked in? I found out that the A/C is slow to come in during slow traffic, where RPM constantly stays below 2k rpm. Once got on the free way and the A/C works just fine.

Thanks,
Ken
 

gunnerzz

2,000 RPM
Jul 3, 2014
2,109
695
713
38
Melaka
Hi All,

Since sweelt talked about A/C, just want to check, if alternator has not enough juice, will that affect the timing of A/C compressor kicked in? I found out that the A/C is slow to come in during slow traffic, where RPM constantly stays below 2k rpm. Once got on the free way and the A/C works just fine.

Thanks,
Ken
Not enough juice..
Worts if the compressor clutch is worn out as the compressor wont engage.
 

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