[meanGREEN]

hows it goin SPIer's, this problem started a few months after i bought my car in 2006, my car a 2001 with 78K spi automatic, it idels low then it will bounce back up again to normal then kinda high.. causing vibrations and you can hear what its doing. it does it both with and without the A/c on(worse with it on) and then some times the car idels perfectly.. its like the car has its bad days?? anyone have any idea of what could be causing this and a way to fix it?? [scratch]

 

[dirtbiker348]

Retune?

 

[Bearkat]

Sticky Idle Air Control Valve perhaps?

 

[63corvette]

u have a vaccum leak i know this because i had the same problem

 

[SmokeyJBluntz]

my vacuum leak made it stall at idle... mine reves than almost cuts out with the heat/ac on

 

[meanGREEN]

if i have a vacume leak were should i check and how would i fix it

 

[Insane]

Back side of the intake mani.

 

[avtopi]

how many hose are connected to back side of intake mani. I have similar issue w/ my 2000 SE. I have 125k miles. I replaced PCV valve and hose that connects to intake mani but no help.

 

[mikebontoft]

is it normal for the SPI to have like a loud fan on sometimes, like when I turn on my ac for example??

 

[loudfocus01]

^^^^
Yeah, your radiator fans come on when you turn on your a/c.
They are loud enough to hear, so that sounds perfectly normal.

 

[norcalfocus01]

if i have a vacume leak were should i check and how would i fix it

get a can of carb spray with a straw and spary all the vac lines and such if there is a leak the car will suck the spray in and rev up a little then just replace the leaking hose or part.

 

[SmokeyJBluntz]

^ not sure, thats how my dad told me to find it, but he said to use starter fluid... mine was on the back side of the valve cover, the rubber elbow rotted out... $30 and about 2 mins to replace

 

[meanGREEN]

okay well i will give this a try and see what i find and let you all know! thanks for the advise

 

[meanGREEN]

i couldnt phsically see any cracks or holes in any of the tubing but which ones should i be lookin at? there seeems to be three main hoses that come out of the intake manifold then branch off to other vacume lines and hoses?? what sould i do pull the hoses off?[scratch]

 

[untothesun]

just fyi have an easy way to tell if the idle air control is workin fine. Check your tach (if it's an auto like mine had to do the dash tach trick)

Start your car with all loads off (ac, lights, fan, ect.) and see roughly at what RPM your car idles.
Give it a min or so and then put all loads on the car.
If the IACV is working properly your car should compensate for the loads and increase the RPM.

I've been having rough idle for a while and trying to fix it myself. So far have changed plugs/wires, cleaned the IACV now and next up is finally getting to my fuel filter (after 80k miles [doorpeek] )