Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

vn misfire , higher than normal idle

andy71

New Member
Joined
Oct 1, 2006
Messages
3
Reaction score
0
Points
0
Any thought on what would cause my 90 mod V6 to suddenly start idling 700rpm higher after a battery change. used to idle at 600rpm now idling 1200rpm.
The motor has a fair miss aswell between 3500 to 4000rpm then takes off.

Prior to changing out the battery I noticed there were two loose bolts on the passenger side ex manifold the one with the ox sensor. Tightened these up . The car actually seems to run slightly smoother now but not too sure what they should idle at.

Thanks in advance for your replys
 
S

Shoxer

Guest
On the 5ltr i know when the battery has been discconnected you have to start the car and hold the RPM at 3,000 for 10seconds. I think that calibrates your idel speed.
 

Immortality

Can't live without smoky bacon!
Staff member
Joined
Apr 15, 2006
Messages
22,472
Reaction score
19,901
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX Calais II L67
you need to reset the idle, as mentioned above, disconnect the battery for for 30 sec. reconnect, start the engine and rev to 3000rpm for 10seconds. then let the throttle go and it should reset the idle. do this with the engine up to running temp and all accesories turned off. if this fails, pull the TB off and give a good clean, especially the IAC valve and associated passages then try the above again. also check for fault codes if this doesn't cure the problem(search for threads elsewhere in this forum on how-to)
 

Redline16

Active Member
Joined
Aug 16, 2006
Messages
935
Reaction score
98
Points
28
Location
Melbourne
Members Ride
MY16 VFII SSV Redline Manual
hey guys, where is the IAC valve located on a vn/vp?
 

Immortality

Can't live without smoky bacon!
Staff member
Joined
Apr 15, 2006
Messages
22,472
Reaction score
19,901
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX Calais II L67
on the side of the throttle body, next to the firewall on the V6, hasa four pin plug on it
 
Top