Cascade Crew

popballz · Posted: Wed Mar 11, 2009 1:46 pm Post subject: very high idle

well my car has been idling at 2500 in park and 1500 in drive

i have no clue what the problem is, do you?

i can manually adjust the iac and make it go down and then just not plug it in

so i thought that was the problem, but i got a new one, and its the same, and they both move the same.

so anyone ever have a problem like this? or know what could possibly be the problem?

thanks

oh ya, its an 89 firebird v6 2.8

Al Hasse · Posted: Wed Mar 11, 2009 2:04 pm Post subject:

You might want to check the coolant temp sender next to the thermostat. I had a 1500rpm or so idle when warm, replaced the CTS and fixed the idle. It didn't throw any codes either.

Twilightoptics · Posted: Wed Mar 11, 2009 2:59 pm Post subject:

How are you "manually" adjusting the IAC?

popballz · Posted: Wed Mar 11, 2009 5:45 pm Post subject:

Twilightoptics · Posted: Wed Mar 11, 2009 6:15 pm Post subject:

High idle usually means air is getting in somehow. With a maf system that usually makes for rough running. Find someone with a scanner to see what the ECM sees for temp. Might try replacing the iac. And making sure the throttle isn't sticking open.

popballz · Posted: Sun Mar 15, 2009 2:30 pm Post subject:

can someone tell me where this vacuum lines go?

the green line was just sitting there, going to nothing
the blue one was capped off by my dad years ago because he could not figure out where it went
and the red one actually goes somewheres, but that line is pretty rotted,
and where they all meet is a T

so could this be my problem?

Twilightoptics · Posted: Sun Mar 15, 2009 2:34 pm Post subject:

It's possible.

The blue one I can't think of anything on that side it'd go to. How big is the line? Rubber or Plastic?

Do you have the vacuum routing diagram on your hood still?

The Green one goes to a big ball under the battery. It's the vacuum reservoir. If it's not hooked up, it needs to be. It keeps vacuum for cruise and your HVAC in the event you don't have any vacuum (IE car off or WOT)

Al Hasse · Posted: Sun Mar 15, 2009 2:43 pm Post subject:

Are those all connected at the back of the intake? I think the blue one either goes to the charcoal canister or to the air pump, the only 2 places on that side to hook up to on that side I think.

Here's a V6 diagram I "borrowed" from someone, I think it was Tony Very Happy

popballz · Posted: Sun Mar 15, 2009 3:22 pm Post subject:

Twilightoptics · Posted: Sun Mar 15, 2009 3:39 pm Post subject:

if you have a bad leak it's immediate. Looks like you do gave a map system so the high idle is most definitely a vacuum leak

popballz · Posted: Sun Mar 15, 2009 4:14 pm Post subject:

chevymad · Posted: Sun Mar 15, 2009 4:16 pm Post subject:

If a crack in a rubber line opens and closes it might do that. Also a leaking brake booster can do that. Try pinching off the vacuum line going to the brake booster.. If your idle changes its shot.

popballz · Posted: Fri Mar 27, 2009 9:09 pm Post subject:

BigDaddyVu · Posted: Fri Mar 27, 2009 9:12 pm Post subject:

mine liked to break under the throttle body.