Exhaust leak causing idle problem?

[ohlegend]

I have to unplug my maf to keep my car idling.
I found an exhaust leak under my header (turbo inlet)
Would this cause my car not to idle (with the maf plugged in)?

Also how important is it to have a ground wire running to the cat converter?
I just put on a Megan 3" (cat delete) and did not attach the old ground.
Would this cause problems too?

 

[92AWDHX40]

Well idle issues could be a number of things such as
http://www.dsmtuners.com/forums/articles-engine-fuel/191137-how-fix-your-idle-surge-problem.html

but fix that leak if you know its there any leak isnt good.

 

[ohlegend]

Replaced my pacesetter header with the stock one and it fixed the leak. Finally got a cel - P0135 O2 Heater Circuit. Is this related directly to the sensor itself? What about the ground connection in the cat converter area? Important or No?

 

[choice]

I would check for a vacuum leak or a boost leak.

 

[Cdc1221]

Try hooking that ground back up. I'm no expert, but it could be the ground for the heater circuit in the o2 sensor. The sensor itself has its own ecu ground. If that doesn't work, it could be a faulty sensor

 

[spyderdrifter]

The ground back there is not related to the o2 sensor. Mine isn't connected to my Apexi exhaust and I haven't had issues since I installed it last summer. The CEL is specific to the o2 sensor itself. The CEL is saying the o2's heater element is faulty. You most likely need a new o2.

 

[ohlegend]

Thank guys! i have new gaskets and o2 sensor on the way!

 

[ohlegend]

I found out that my timing was off just a tooth or so.