I am having a fast idle on start up but it soon goes back down to a idle.It has been doing this since I bought my Xj over 2 years ago.Is this normal for Xj's to do this or is this a faulty sensor?
Tapatalk is active for this site! Just go to your phone's store to download and install.
I am having a fast idle on start up but it soon goes back down to a idle.It has been doing this since I bought my Xj over 2 years ago.Is this normal for Xj's to do this or is this a faulty sensor?
It depends. How fast for how long. A lot if engines, including my Cheyy will start up a little fast but go back down once the computer is able to determine rpms.
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
About 5 seconds I am going to say.It's not really a problem really, just wondering if that's normal.It does it most every time,only once in a blue moon it doesnt.
5 seconds might be a little long. Or it might seem like 5 seconds. But I don't see a problem.
230 hp 4.3L Chevy
Built 4L60E with manual lockout
Atlas 4 speed
Griffin radiator
On board air
Warn 9.5ti on custom bumper
7.5" RE front and bastard pack rear on custom long arms
30 gal gas tank
lockers
And a bunch of other stuff
Later XJs may be different but the Renix era ones will do that if the TB is dirty or if the MAP sensor is not satisfied (from a leak) but newer XJs have a different ECU and I am not sure how they react.
Hey bubba get your hand off my ass,
Some days it is just not worth it to gnaw through the leather restraints.
R.I.P. Brian 96_XJ Perrine 1990-2011
I was going to say clean the TB and sensors... and make sure you have no leaks both wtih the TB as well as any vaccum lines that you might have...
Port fuel injection does a "Idle-flare" on start up. This is because it is easier for the computer to establish idle coming down to the desired rpm as opposed to pulling the idle up to the number. As long as its within a few seconds that idle stabilizes its normal.
Bookmarks