Ever since I got my A/C compressor changed the idle has staid up around 900-1000...and when I turn the A/C on its stays right there.. It did drop down a few weeks ago after I reset the computer but now its back up... ??
Spark plugs are new, No engine light, Evap system was all taken care of today for the light, IACV has been cleaned, fuel filter is new...
When I stop at a light, the idle only dropps below if the engines cold

What do I do >??

-Matt

 

Anyone know ?? Its been like this ever since I got my A/C compressor changed and when I put the A/C on the idle doenst change like it used to, suppose to ??


Ive cleaned the IACV twice thinking something is stuck, but its all clean ??

 

Sounds like your throttle stop screw was tampered with. I'd turn the idle down slightly with that stop screw. Go in 1/8 turns until it runs correctly. Don't go more then 1/4 - 1/2 turn!!!

If your uneasy about that adjustment, stop by one day and I'll do it for ya.

Tom

 

Tom,

I bet you the guy at the shop messed with it...Whould that explain why the RPMS dont move when I turn on the A/C cause its already idleing that high ??

I have no problem with doin the adjusment, I just need to know where its located ?? and whats the screw do ?? Ill read some haynes tonight and see if I can find it...

-Matt

With the idle work again (stay up alittle till i stop then go to about 550) once I correct the screw ??

 

You got it!
Yes it should. If that screw was indeed moved a bit, your default throttle plate opening is allowing to much air to enter the TB and causing your idle to be so high that the ECU cannot lower it with the IACV.

The Haynes manual isn't going to give you any info on that screw. It may even tell you not to touch it. It's located on the TB, if your looking directly at it, it's down under where the linkage is. Sort of on the left side, down low. You'll see it.

Try this - Disconnect your TPS sensors and start the car. Do this when it's at operating temp. Then adjust that set screw until you have 600 RPMs. Turn the car off, reconnect the TPS sensors and you should be OK. Check it with the A/C. When you turn the A/C on, you should bump up to 700 or 750 RPM's. If that happens, then your IACV is now working. If your still to high or to low, move the screw slightly untill you can detect the IACV taking over your idle speed.

Any questions, just stop by my house any Saturday and we'll do it together. Takes only a few minuts.

 

Try everything Tom mentioned and if that doesn't work, one more thing to try is cleaning or replacing your air filter. I had a similar problem with High RPMs. I tried everything you mentioned, plus I cleaned the throttle body.

Then I clean my filter on my CAI, which was VERY dirty, and I also cleaned the screen before the MAF, which somehow had little particles of dirt (BAD!). So after that with a new, clean filter my RPMs are normal and they've stayed that way for about 6 months. It might not be your problem, but it's something easy to check out and consider.

 

Why not just adjust the IAC?.I adjusted my idle that way, and it works fine.

(Black phillips head ****, on top of the sensor pack towards the passenger compartment from the throttle body). It's meant for controlling the idle RPMs.

IanS

 

I tried adjusting the black screw and it does nothing to my idle probably because its set to high on the throttle linkage to begin with
The filter was cleaned last month

Tom,
The screw that your talkin about is what the throttle rests apon at idle, right ?? I may sound stupid but where is the TPS located ??

-matt

 

You said you reset the ECU, right? Be very sure that the ECU reset screw is back to the original stop position. If not, the idle will seriously be affected and will not resolve over time. I have used this screw in conjunction with IACV idle screw adjustments to steady a low idle/vibration problem i had. Your screw may still be left in the wrong position.

 

Yes Matt, thats the screw. The TPS are the 2 electrical connectors on top of the TB. Opposite the linkage.

Check out what Stillen_I30 said. I wasn't aware that the ECU screw did effect idle, but it's possible. Weren't you having a problem with that screw turning with no stop??

 

Another possible cause might be the solenoid that gets activated by the A/C. I don't know exactly what it's called but it is linked to the A/C system and is what bumps your idle up when the a/c is on. Maybe that solenoid is stuck in the on posistion causing your idle to be where it would if the a/c were on? I'm pretty sure there's a description of this in the Haynes manual. Good luck. Btw, I wouldn't mess w/ the idle screw on the TB. just my .02

 

I agree,unless the screw was messed with you should leave it alone.
Mine has a little strip of red paint (from the factory) that shows its original alignment. I was having racing idle after IACV clean, ECU reset, filter, plugs, etc. were all adjusted, replaced or cleaned. My issue ended up being the throttle cables themselves. They weren't quite allowing a full return to resting position. I just loosened them up a bit and readjusted the tension; problem solved. Worth a look.

Cheers,

JK

 

Well I tryed adjusting that screw but even the smallest setting the idle is still up at 1000 and theres no where else for the throttle to go...I really think its the A/C seliniod like toolrocks was saying because it started happening after I got it done..Im going to have the guy that did the A/C take a look at it...is there a chance that my IACV needs replacing ?? Ill also reset the ECU tomorrow and make sure the screw is in right

-Matt

 

There is no A/C solenoid, your IACV contorls your idle speed. When the A/C is on, your IACV bumps your idle up.

Is your throttle cable binding or to tight, holding your throttle open slightly? If you move that set screw just slightly, your idle should change. Something doesn't sound right.....

Maybe you have a vaccume leak someplace.

 

There is an A/C solenoid and a power steering solenoid. They are both located on the IACV. Check chapter 6 of Haynes, section 16. There is a check you can perform; you'll need a multimeter. If you're looking at the back of the IACV, the A/C solenoid is on the right, bottom - closest to the firewall - I can't describe it, either get the manual or have your mechanic check it out. Good luck.

 

i would check for a vacuum hose that may have been disconnected during your service