Quote:
Originally Posted by Mohawk_1SS
Would this tend to rule out an exhaust leak?
Regards
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No. It's asking for more fuel on both banks. If anything, it says the sensors are likely not the issue. Since the trims are pegged asking for more fuel, the place to start is unmetered air.
The usual places a sensor would detect unmetered air is either IM or Exhaust connection. Even an exhaust connection shortly after the sensors will sometimes wash enough fresh air to be picked up. Which is why we tell folks who delete secondary cats from the OE setup to make extra sure there are no exhaust leaks there, as it will throw a code. Also why I prefer V-Band's or welds only on the exhaust. Typical factory flanges at the manifolds are prone to leak after disconnecting/reinstalling.
Like most have pointed out already, another common leak point is the intake manifold. I can't say I've ever had intake bolts back out, but you should always re-check your bolt torque after the first couple heat cycles to make sure they are still to spec. Same with your exhaust bolts/studs. Parts expand and contract at different rates when heated/cooled.
And of course, check all vacuum connections to the manifold as well.