HotRodDodge

06 V and I have a problem that seems to come and go. When I go through the gears (driving normal) the revs will hold when I let off the throttle to shift, will do that off and on or sometimes after I come to a full stop at a light the RPM,s will hold at about 1500 and slowly drop to idle. Any thoughts? Car is basically stock, magnaflow cat back, K&N intake and a mild tune.

FuzzyLog1c

iTrader: (4)

You may have a vacuum leak between the MAF and the throttle body. Check your intake tube and PCV hose for holes, leaks, or looseness.

HotRodDodge

Never thought of that! I'll check that out.. that reminds me of another possibility, my K&N was for a 04-05 and didn't have the vacuum tube in the elbow so I drilled and tapped a fitting to hook it back up, is it maybe to large?

FuzzyLog1c

iTrader: (4)

That's possible. Back when I had my Lingenfelter intake tube (which also lacked a provision for the 06/07 PCV), I sealed the hose barb / intake tube interface with a dab of Permatex Ultra Black. However, don't put all your eggs in that basket--another thing to check is that dirty air PCV breather hose (P/N 12594779) next to the throttle body.




Image Credit: Pirate4x4 Article

Choppy_Idle

The last Pirate Pic is a LS1 engine, isn't there something different to the LS6 in regards to oil steam lines or was it the gas steam line coming from tank?

I closed the upper hole which is showed in the pic with green arrows and it was definitely a oil steam INLET coming from valve covers, not the opposite of it, this pic seemed curios for me...

Greetz
Ron

Mike ctsV

Mine seems to do that sometimes also, maybe ill check those two hoses, bone stock no mods.

Naf

iTrader: (1)

The ls6 has a hole from the intake to the passenger side valve cover.

You have a small air leak causing the rom. Check your ltft it should be +/- 4. If its positive in the teens its an air leak.

Mike ctsV

I'm looking at mine and It has a tube from the passnger valve cover to the throttlebody and one from the intake to below the intake. Should I pull them off withsome plyers and inspect them? Also do these cars have pvc valves anywhere?

Naf

iTrader: (1)

Be very careful not to damage the hoses when you remove

Mike ctsV

Well, mine hose broke off at the bottom when i was removeing it, it was brittle, so hopefully i can find a u shaped hose at the parts store

Mike ctsV

Should I just go by a foot of this and replace both of them then? What size do you think the hoses are? Looks like it measures around a quarter inch, the hole inside the hose

Mike ctsV

Went to advance and got two feet of the 3/8 inch fuel hose, seems to be a good fit, hopefully i can make that bend, cause they didnt have nothing that shape in stock

HotRodDodge

I checked mine all over today, all clamps tight between maf and throttle body and that small U shaped hose behind the throttle body is still soft and looks fine so I didn't bother pulling it off.

HotRodDodge

Mine is an LS2, I checked my ltft and it's sitting between 0 and 1 sitting at idle

Mike ctsV

I can't make that bend without it kinking up, so could i run it longer and go around the harness? I could make that work without kinking, or does it have to be short like that?
Anyways i ordered an oem one from ebay for 7 bucks. What i did might work but im gonna put the oem part on just incase

Naf

iTrader: (1)

If yours hangs while shiftin, look at your tune, the airflow follower could be set too high

Byron

iTrader: (1)

GM part number 12594779 make sure it is the orange printed one. It's all of $7.99. You most likely paid more for the 3/8" hose than it costs.

The cool thing is that you have half of what you need to run a catch can now, and 3/8" hose is always handy.

-Byron

HotRodDodge

I will have my guy check that, just seems odd that it comes and goes. Can be fine for months and then start doing it again for a week or so. I did an idle relearn on it yesterday and it is better but still doing it

Byron

iTrader: (1)

​​​​​​Mine did this quiet a bit until I unclogged the pcv system and restored it's function.

The U shaped hose running from the valley cover to the intake had an air leak which caused high idle.

I also installed a new clean air hose which had also been leaking. The clean air hose is the one that runs from the air intake tube, to the valve cover.

-Byron

HotRodDodge

I'll check that out! Thanks for the reply's guys