would a bad latch relay cause the IAC to stick?

I've swapped with 2 different IAC's and neither will move at all, is it possible a bad latch relay could cause my problem?

Possible, have you checked to see if it is getting current? Have a multi meter? If you don't I would definately suggest getting one becuase it is a must for chasing electrical gremlins in the XJ.

yes....
I suspect that is my problem because My engine revs up to 2500rpm at start up and then stabilizes.If I disconnect my iac the engine starts and revs normally.I think my latch circuit is not "parking" my iac right at shut down....barring that my iac is slow,lol.


What problems are you having?Your engine should run without the iac....mine is disconnected as we speak and has been for the last year because I got tired of the motor soaring to 2500 everytime I started it.

I let the idle stabilize and pulled the iac connector...this is assuming the iac is functioning in the first place(in your case it seems it isn't)

The latch circuit does one thing to the iac.....it positions it for the next start up.The ecm controls the iac from there....

oh, the engine idles at 3000 RPM.
I have the passage to the IAC blocked with some plastic and it idles fine but without that it's not driveable.

I have a multimeter, yes.

my only other possibibility I guess is a bum IAT sensor, can't think of anything else unless all 3 IAC's are bad.

I wouldn't worry about it but now it's cold and a pain to keep it running for the first few minutes.

does the iac connector have voltage?

it's currently 10 degrees out and I'll check tomorrow.

OK finally got around to it, had +9.8v on two of the legs to the IAC so I guess it's getting voltage.

philip_g said:

oh, the engine idles at 3000 RPM.
I have the passage to the IAC blocked with some plastic and it idles fine but without that it's not driveable.

Click to expand...

That tells me you have a vacuum leak somewhere. get a plumbers torch and turn on the gas but do not light it up. Use the torch head as a sniffer and go around the intake, TB, EGR and lines. If the idle speed changes you found the leak.

he said he blocked the iac port and it idles fine.....

outlander said:

he said he blocked the iac port and it idles fine.....

Click to expand...

that means the vacuum leak is already giving it enough air anyhow haha.

CommandoXJ96 said:

that means the vacuum leak is already giving it enough air anyhow haha.

Click to expand...

Thats the point I was making, if the IAC port is plugged and it idles good it is getting air from somewhere!

Yea....I guess that makes sense:cheers: