low idle after tune up

[subyguy]

hey guys,

I tried searching on this but all i could find was teh stalling issue on idle which i dont have. so heres teh story. I have a 97 rt bone stock and about a week ago one of teh spark plugs came off. Luckily the threads were fine, it was probably loose from teh previosu owner. So i changed the plugs and wires but now it feels like the car idles low and shakes alot more. Plus i lost that lumpy cam sound on idle.

alot of people say IAC, clean TB's, etc. I have a feeling its a vacuum leak because when i cold start it and rev i hear a sort of turbo cold air whistle sound. Where are all teh vacuum lines located and are they easy to get to. What other things should i be looking for.

here is a pic of my idle rpms

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[DrumrBoy]

That seems low for stock. If it jumps around you might try some brakeclean on the IAC. If it stays right there, then you may be right on the vacuum leak.

 

[subyguy]

stays there the whole time. Im going to clean the IAC as well just as a preventative measure

 

[Steve-Indy]

Have you re-checked wires for good connections AND to be sure that you have them in correct location/order??

 

[subyguy]

Have you re-checked wires for good connections AND to be sure that you have them in correct location/order??

I checked 4 times to make sure, everything is plugged in teh correct order and plugged in nicely. i hope i just disconnected a vacuum line by accident

 

[alwayscode390]

Arent they supposed to idle around 740rpm?

Mine makes the turbo whistle sound too , but when I am accellerating aggressively on the road ---

 

[subyguy]

but when I am accellerating aggressively on the road ---

LOL maybe one day mine will also

 

[tlcobra]

My 98 shows about the same but if i use a obd11 tool it shows 700 rpm

 

[Jack B]

That mark is 750, the oem idle is 670. You may want to put a scan tool on it to check the rpm. The only way for the idle to exceed 750 is a vacuum leak or defective iac or pcm

 

[uvbnbit]

pcm been re-set lately? as mentioned, check with scan tool if you can.

 

[subyguy]

No PCM reset. I'm going to get it plugged to a scan tool to see what's up

 

[Darth Menace]

i am not trying to rob this thread, but i am having the exact same problem. I've been idling at about 4000rpm this season. I just did a spark plug change and it shakes a bit more than normal. I am sure i got the wires in the right spot...considering the wires are only long enough to stretch to where they belong. I dunno how to tell if the connection is good though

I will clean the IAC.....but where is it?

 

[subyguy]

It is located on the passenger side intake right before the throttle body. Let me know what happens

 

[uvbnbit]

i am not trying to rob this thread, but i am having the exact same problem. I've been idling at about 4000rpm this season. I just did a spark plug change and it shakes a bit more than normal. I am sure i got the wires in the right spot...considering the wires are only long enough to stretch to where they belong. I dunno how to tell if the connection is good though

I will clean the IAC.....but where is it?

assuming you mean 400. when you guy install new plugs, are you using torque wrench? good practice on plugs to check not to over-tighten as well as not tighten enough. I was suprised how much more I needed to tighten mine when using (in. lb) torque wrench.

 

[Darth Menace]

assuming you mean 400. when you guy install new plugs, are you using torque wrench? good practice on plugs to check not to over-tighten as well as not tighten enough. I was suprised how much more I needed to tighten mine when using (in. lb) torque wrench.

oops, yes i meant 400, haha. Mine has been idling like this all year (it's my first summer with it so i thought it might be normal). Once (if) i find the IAC, how do i go about cleaning it?

 

[subyguy]

assuming you mean 400. when you guy install new plugs, are you using torque wrench? good practice on plugs to check not to over-tighten as well as not tighten enough. I was suprised how much more I needed to tighten mine when using (in. lb) torque wrench.

i hand tightened them like most other vehicles, how much do they need to be at?
i still havent found the problem, i ordered some smooth tubes and airfilters as the originals were pretty dirty and 15 years old

 

[uvbnbit]

My bad on the in.lbs. I'm sure you could convert, but plugs should be installed to 20 ft lbs.(lb ft)

 

[AAKVIPER]

sounds like a vacuum line issue.. or a cracked air line plastic connector..Do you have AC?

art

 

[subyguy]

My AC hasent worked since i got the car, i dont know if its emoty or the compressor. Nothing happens when i turn it on. Do you think that could be an issue?. It enever did that before, only since i changed teh plugs/wires. sounds like the leak is coming from the intake airbox??? is there anything i should look for there. All teh vacuum lines seem fine

 

[ViperTony]

My AC hasent worked since i got the car, i dont know if its emoty or the compressor. Nothing happens when i turn it on. Do you think that could be an issue?. It enever did that before, only since i changed teh plugs/wires. sounds like the leak is coming from the intake airbox??? is there anything i should look for there. All teh vacuum lines seem fine

Your AC hasn't worked since you got the car meaning it didn't blow cold air OR..... Nothing happens when you turn it on since the plugs/wires changed...or both? Confused.

 

[subyguy]

my AC has never worked since i had teh car. no cold air no compressor coming on.

I meant this idle problem only surfaced after changing the wires/plugs.

 

[Viper98912]

My 97 sits just as in the picture at idle. I also thought that was 400 but now that I look at the tick marks again in the pic I learned something new