HELP PLEASE: Engine Idle Problem

semtex · 06-25-2009, 02:02 PM

That song "We are the World" is playing in my head now. Thanks nogood.

Kyle@STILLEN · 06-25-2009, 04:35 PM

I was hoping to come in and offer some technical advice but it appears you have received the help you need. So, instead I will simply offer an opinion: This is the one time in life when kinky hose(s) are a problem.

rench · 06-26-2009, 01:53 AM

Quote:

Originally Posted by Kyle@STILLEN

I was hoping to come in and offer some technical advice but it appears you have received the help you need. So, instead I will simply offer an opinion: This is the one time in life when kinky hose(s) are a problem.

LOL.... Also have to say I'd be a little iffy about taking my car back to the person that did that. Its a simple intake and hes supposed to be an experienced mechanic? yet kinks a hose like that and sends it out? theres no way that hose wasn't kinked when he put it on.....

semtex · 06-26-2009, 11:50 AM

He's not taking it back to the original installer. He bought his Z from someone with this intake already installed.

nogoodname · 06-26-2009, 12:48 PM

Quote:

Originally Posted by semtex

That song "We are the World" is playing in my head now. Thanks nogood.

that song played on CNN about MJ

6SPD_FTW · 06-26-2009, 03:41 PM

That's the fresh-air feed for the PCV system. 80% of blow-by that gets past the piston rings is fuel vapor. Manifold vacuum sucks the fuel vapors out of the crankcase, and your kinked off hose is what allows fresh air to circulate into the crankcase so that a vacuum doesn't build up in there.

The ECM doesn't really have a way to monitor the PCV flow, per se. It is figured and programmed into its little brain to know how much flow at X rpm and Y load.

So, if that hose is kinked off, then the PCV flow is WAY less because it can't draw in fresh air to restore what the manifold is sucking out. And proper PCV operation is EXTREMELY important to a smooth idle!

So, the bizarre idle you're having, I will say with 100% assurance, is definitely the kinked off hose. Just sayin...

Late,
Trav

myfirstz · 06-29-2009, 05:40 PM

Quote:

Originally Posted by 6SPD_FTW

That's the fresh-air feed for the PCV system. 80% of blow-by that gets past the piston rings is fuel vapor. Manifold vacuum sucks the fuel vapors out of the crankcase, and your kinked off hose is what allows fresh air to circulate into the crankcase so that a vacuum doesn't build up in there.

The ECM doesn't really have a way to monitor the PCV flow, per se. It is figured and programmed into its little brain to know how much flow at X rpm and Y load.

So, if that hose is kinked off, then the PCV flow is WAY less because it can't draw in fresh air to restore what the manifold is sucking out. And proper PCV operation is EXTREMELY important to a smooth idle!

So, the bizarre idle you're having, I will say with 100% assurance, is definitely the kinked off hose. Just sayin...

Late,
Trav

I fixed it myself!!! The most difficult part was removing the brace that crosses the engine cover. Anyway, no more engine idle problem. Actually, both hoses had a kink. The left intake hose was the worse. The right had a slight kink due to hose being too long. I test drove after unkinking the hoses and I can FEEL the difference in POWER!!! Thanks to all of you who provided input. Special thanks to SEMTEX for providing the photos.

06-25-2009, 02:02 PM	#16 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 53 Posts: 5,995 Drives: People to drink Rep Power: 32	That song "We are the World" is playing in my head now. Thanks nogood. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

06-26-2009, 11:50 AM	#19 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 53 Posts: 5,995 Drives: People to drink Rep Power: 32	He's not taking it back to the original installer. He bought his Z from someone with this intake already installed. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

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06-25-2009, 04:35 PM	#17 (permalink)
Kyle@STILLEN The370Z.com Sponsor Join Date: Dec 2008 Location: Newport Beach Posts: 626 Drives: Toyota Tundra Rep Power: 306	I was hoping to come in and offer some technical advice but it appears you have received the help you need. So, instead I will simply offer an opinion: This is the one time in life when kinky hose(s) are a problem.

06-26-2009, 03:41 PM	#21 (permalink)
6SPD_FTW Base Member Join Date: May 2009 Location: Bristol, VA Posts: 59 Drives: 09 370Z Bl 6MT Rep Power: 16	That's the fresh-air feed for the PCV system. 80% of blow-by that gets past the piston rings is fuel vapor. Manifold vacuum sucks the fuel vapors out of the crankcase, and your kinked off hose is what allows fresh air to circulate into the crankcase so that a vacuum doesn't build up in there. The ECM doesn't really have a way to monitor the PCV flow, per se. It is figured and programmed into its little brain to know how much flow at X rpm and Y load. So, if that hose is kinked off, then the PCV flow is WAY less because it can't draw in fresh air to restore what the manifold is sucking out. And proper PCV operation is EXTREMELY important to a smooth idle! So, the bizarre idle you're having, I will say with 100% assurance, is definitely the kinked off hose. Just sayin... Late, Trav