[va335i]

I have a Cobb tune on my car and everytime the past few days I go WOT I get the 1/2 engine signal. I just had my coil pack replaced, but this did happen from time to time before the service was done. Now it is everytime I go WOT. I have 80k on my car so I checked the vacuum tubes going over the engine block and they looked ok from what I could tell. I did not know if anyone has had this problem under the same conditions as me and could give me a strarting point. Any ideas would be greatly appreciated. I know the code is related to vacuum system from what I have serched on the forum.

I hooked up the access port and monitered the boost. Sitting still and declerating I show -neg boost numbers is this normal.

Sorry for all of the noob questions. This is the first turbo car I have ever owned. Most of the rest were all LSX powered.

[Jeff@TopGearSolutions]

Looking ok is not the issue. Just replace them you have too much mileage on them as it is. They should have been replaced at 50K as regular preventive maintenance.

Nobody here can tell you what is leaking. You need to start inspecting or replacing items thoroughly.

Vac Lines
Tighten Clamps
Pressure Test System
Boost Solenoids
Sticky wastegates
ETC


I just wrote about 6 paragraphs in another thread about 30FF. Check it out.
Negative boost is normal at idle.

[Tiago@VRSF]

I'd start with a boost leak test. If you don't have the tools to do it yourself I'd look into finding a local shop who can do one for you.

[va335i]

Thanks for the info. I will try to find a shop.

I am sure the lines were replaced at 50k since the CPO just ran out and I am the second owner. I will replace them anyway with the silicone ones.

[Tiago@VRSF]

A boost leak test will tell you if they require replacement.