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low idle speed

jagrob
Posts: 64
Joined: Thu Jan 19, 2012 5:44 am

low idle speed

Postby jagrob » Thu Feb 25, 2021 10:10 pm

hi all, what should be the idle speed? mine is about 600-650 which to me seems just a bit to low. am thinking about 700 would be better. any thoughts please. thanks.
1995 xjr 4.0 supercharged.

abercanadian
Posts: 1531
Joined: Tue Oct 16, 2012 6:50 am
Location: Vancouver Island

Re: low idle speed

Postby abercanadian » Thu Feb 25, 2021 11:48 pm

If it doesn't stall in D, you're good.

Larry
94 XJ40 VDP vin 701729
Oyster Metallic/Doeskin on Aero Alloys
240,000 km/149,000 Miles
Daily Driver

94 XJ40 SOVEREIGN vin 703632
Diamond Blue Metallic/Barley
111,000 km/69,000 Miles
Parts Car

jagrob
Posts: 64
Joined: Thu Jan 19, 2012 5:44 am

Re: low idle speed

Postby jagrob » Fri Feb 26, 2021 12:53 am

car does not stall but can get close sometimes.
1995 xjr 4.0 supercharged.

Frank123
Posts: 3
Joined: Mon Oct 12, 2020 7:53 pm

Re: low idle speed

Postby Frank123 » Fri Mar 05, 2021 10:09 pm

If it's an automatic, check your gearbox oil is not over-full. (over filling causes the lock-up to prematurely engage and stalling issues)

600-650 rpm sounds about right when it's in D.

jagrob
Posts: 64
Joined: Thu Jan 19, 2012 5:44 am

Re: low idle speed

Postby jagrob » Thu Mar 11, 2021 6:33 am

gearbox oil seems ok. not been topped up since the low revs.
1995 xjr 4.0 supercharged.


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