PCV Breather Hose to TB

[bmarigoni]

Hi,

I just rebuilt the head on a 2005 Aveo 1.6 due to timing belt failure (86,000 miles and it had been done once before the car was purchased.) All 16 valves had contacted the pistons.

Anyhow, after re-assembly, I noticed that there was a large vacuum hose neatly tucked away behind the intake manifold, and it was connected to the TB. When I pulled the hose out, it was sucking a lot of air. The memory on the hose led me to the PCV valve. (I did not unhook this when I dis-assembled the car). When I hooked it to the PCV, the car died, and would not re-start until the hose was again disconnected. I cleaned the PCV valve (because all the parts for this car are special order) and left the hose connected. I attempted to adjust the idle to compensate, but instead I just messed up the idle worse than it was.

My question is.. Would a bad PCV valve cause this problem? I was tempted to leave it alone, as someone had deliberatly left this unhooked, and it was not throwing a CEL. Once I left it hooked up and adjusted the idle, a CEL for intake air leak popped up.

Thanks

[Daniel]

Hi,

By PCV do you mean "purge canister valve" located on a braket at rear of engine? If so the hose has to be connected between PCV and TB. To me the PCV is closed most of the time and pulse opens to allow small amount of fuel vapor to intake manifold. If you can start engine with throttle slighly open there is probably something wrong with idle valve. Idle is software set and should not be adjusted by the rest throttle screw.

IMHO,

[MMamdouh]

maybe he is referring to Passive Crankcase Ventilation... a pic would be very helpful here

MMamdouh

[Daniel]

maybe he is referring to Passive Crankcase Ventilation... a pic would be very helpful here

MMamdouh

That's a possibility since PCV acronym has many interpretations. +1 for a pic

[Trey05Woo]

Yes it can however, not your most likely cause BUT i would start by replacing the valve and seeing if it cures the problem. Its very possible because they build engines very tightly sealed these days. The easiest way to remove a pcv restriction is by disconnecting the pcv valve. If I had the car I would perform a cranking vaccum test, and a compression test. PCV issues usually point to other problems like internal engine problems, exhaust restrictions, sludged up engine, etc.