Fuel Cut/Loss of power @ 0 lbs. Options

[erics1one]

My VAC is between -19 & -21 at idle, but when I try to boost and it reaches 0 lbs, I lose power. My RPMs are normally around 2500-3000 when this happens. If I punch it (which I hardly ever do) I can get it above 0 lbs and boost fine.

The turbo has no shaft play, and was installed a couple of weeks ago. I'll be bringing it down to the shop today, but wanted to see if anyone here knew what it might be.

Thanks.

[lagos]

my guess would be boost leak, or exhaust manifold leak. do you have a fmic, or topmount?

[nik]

how do you have mbc hooked up?

[thedevilmaycrie]

alomost the same prob i had ... cap off the VAC line between the wastegate actuator and the TVSV

[Supersprynt]

I dont think he has a 3sgte - atleast his profile doesnt say so.

[erics1one]

I have the 5SFTE

The right side VAC line on the wastegate actuator is capped.

I have a front mounted Spearco Intercooler.

Thought that it was a manifold leak as well, checked this morning, everything is tight. I used the correct torque setting when installing the new turbo.

I'll get some pictures of my VAC line setup when I get home.

This post has been edited by erics1one: Nov 23, 2004 - 1:25 PM

[erics1one]

Not all vacuum lines were zipped tied.

Zipped 'em all up, reset the ECU, problem went away. Must have been a loose line.

Would be nice if it was my only problem

[lagos]

yeah, loose vac lines= boost leak. i noticed that the metal hose clamps you can get at pepboys work a lot better then zipties, so you might want to look into those if your ties fail.

what type of vac readings to 5sfTes get at idle anyway?

[erics1one]

It usually sits between -19 to -21.

I still get a lot of resistance/hesitation below ~2700 rpms untill the boost kicks in. Pretty sure thats typically normal with this kit, but am interested to see how much a dyno tune will correct which I plan on doing soon.