still running funny

**shady milkman** · 04-06-2009, 01:06 PM

ok guys so i have been having trouble with my car and a vacuum leak since i changed to a ls6 intake...well i think i have fixed the leak...but now the car constantly searches for idle..all under 1k...and when i brake and then go idle it almost stalls..and when i am idling and go to throttle there is a big hesitation and then takes off....i know it sounds like a vacuum leak but its weird..this all only happens at Closed loop...when its cold..it idles a little high...about 900-1k ...i dont know..i am at wits end with this car.

**disc0monkey** · 04-06-2009, 01:22 PM

starting with the basics. you reset the computer?

**shady milkman** · 04-06-2009, 01:35 PM

Originally Posted by disc0monkey

starting with the basics. you reset the computer?

yeah sorry...i should have said that i did a pcm idle relearn. ...

**shady milkman** · 04-06-2009, 01:38 PM

egr and air is deleted right now..and i dont have access to a scanner to check to see if there is still a vacuum leak etc...i wonder if the iac might be acting funny..

**Cutlass** · 04-06-2009, 05:08 PM

Where was that previous vacuum leak? Did you replace the coolant pipe or try to squish the intake down over the existing LS1 coolant pipes? New intake seals? What have you tried?

**shady milkman** · 04-07-2009, 04:18 AM

Originally Posted by Cutlass

Where was that previous vacuum leak? Did you replace the coolant pipe or try to squish the intake down over the existing LS1 coolant pipes? New intake seals? What have you tried?

the previous leak was coming from behind the intake..went to get it smoked and that is all he could tell me..the thought from underneath..so i replaced the gaskets....i bought the ls6 coolant line with the plugs..and made sure to break off the tabs on the knock sensor wires...i later found out my pcv line had two tears in it..so i fixed those..and it immediately ran better...but now its just acting funny durring those situations..not all the time like before..id really like to get a scanner on it and log and see if i am running a vacuum leak still

**0rion** · 04-07-2009, 05:38 AM

almost sounds like a fueling issue to me except for the high idle. Have you cleaned the maf recently? I'm kinda confused when you say it's doing it. Cold or warm? I would imagine you've had the intake and air tract off a few times chasing it down so it wouldn't be a bad idea to go over everything with a fine tooth comb and look for something you may have missed. Are your vents inside the car working fine? There's a small vacuum line at the back of the intake that's fairly common for people to miss. A sign that's left off is the vents inside won't work.

**Damage Inc.** · 04-07-2009, 08:09 AM

Did you re-do the idle learn after repairing the vac leaks?

**shady milkman** · 04-07-2009, 12:37 PM

Originally Posted by 0rion

almost sounds like a fueling issue to me except for the high idle. Have you cleaned the maf recently? I'm kinda confused when you say it's doing it. Cold or warm? I would imagine you've had the intake and air tract off a few times chasing it down so it wouldn't be a bad idea to go over everything with a fine tooth comb and look for something you may have missed. Are your vents inside the car working fine? There's a small vacuum line at the back of the intake that's fairly common for people to miss. A sign that's left off is the vents inside won't work.

warm is when it happens...yea i plugged the hvac hose in..and air/heat all work...maf has recently been cleaned....i am not getting misfires ect ....no blinking SES

**shady milkman** · 04-07-2009, 12:37 PM

Originally Posted by Damage Inc.

Did you re-do the idle learn after repairing the vac leaks?

**0rion** · 04-07-2009, 01:47 PM

does it do it at all when it's cold? Do you have your rear O2's you could swap up front to test? That bog and hesitation sounds like a fueling issue to me but I could be wrong.

**Frost** · 04-07-2009, 02:10 PM

are you using the same TB (or, has the TB been modified?)

**shady milkman** · 04-07-2009, 03:45 PM

Originally Posted by 0rion

does it do it at all when it's cold? Do you have your rear O2's you could swap up front to test? That bog and hesitation sounds like a fueling issue to me but I could be wrong.

not really..the idle will bounce a little but not all that bad...its about 8-900 rpm...yea i might have to do that..wot fueling feels good ..there is no lack of pull up top.

**shady milkman** · 04-07-2009, 03:45 PM

Originally Posted by Frost

are you using the same TB (or, has the TB been modified?)

yes stock tb..

**Wesman** · 04-07-2009, 03:53 PM

Any codes, previously set or new?? Almost sounds like it could be the IAC valve, if its stuck it could possibly produce the effects you describe. I would take it off and make sure its not clogged with carbon, could just be a coincidence that it started acting up when you installed the LS6 manifold. If you had a GM Tech II you could command the IAC to a certain postion and then see if it reacts accordingly, its a great test to see if you have a faulty IAC.

**shady milkman** · 04-07-2009, 04:10 PM

Originally Posted by Wesman

Any codes, previously set or new?? Almost sounds like it could be the IAC valve, if its stuck it could possibly produce the effects you describe. I would take it off and make sure its not clogged with carbon, could just be a coincidence that it started acting up when you installed the LS6 manifold. If you had a GM Tech II you could command the IAC to a certain postion and then see if it reacts accordingly, its a great test to see if you have a faulty IAC.

i thougt so too..so i cleaned it..at least i thought i did...its still acting funny..but maybe its just sticking ..clean or not

**shady milkman** · 04-07-2009, 04:11 PM

Originally Posted by Wesman

Any codes, previously set or new?? Almost sounds like it could be the IAC valve, if its stuck it could possibly produce the effects you describe. I would take it off and make sure its not clogged with carbon, could just be a coincidence that it started acting up when you installed the LS6 manifold. If you had a GM Tech II you could command the IAC to a certain postion and then see if it reacts accordingly, its a great test to see if you have a faulty IAC.

no codes..just egr, and air related

**shady milkman** · 04-08-2009, 05:00 PM

got my codes read again..lean on both banks..i think i am going to cap off the pcv..and vent the passenger side to see if the idle improves and the lean condition improves. So sorry frost..you wont be getting my pcm until i fix this problem

**Frost** · 04-08-2009, 08:16 PM

Originally Posted by shady milkman

got my codes read again..lean on both banks..i think i am going to cap off the pcv..and vent the passenger side to see if the idle improves and the lean condition improves. So sorry frost..you wont be getting my pcm until i fix this problem

It's all good. Just keep me in the loop.

**shady milkman** · 04-09-2009, 04:05 AM

real quick frost..when you tune my car can you enable me to start in 2nd when my gear selector is in second...like the 99+ do..or is it a mechanical thingy?