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P1101 set in Cruze or Sonic
Posted to Technical Tips Forum on 9/27/2014 8 Replies

There have been problems with P1101 set in the Cruze or Sonic with the 1.4 turbo engine. Lean codes may also be set with possible rough running or idle surge complaints.

The problem is caused by unmetered air entering the engine through the PCV system. Several PI's have been published to address this problem. PIP5197 and PI0907B among others. The first place to check is the throttle position angle with GDS2. A normal reading at hot idle is 8-12%. With a failure, the number will be much lower, usually 0-1% although less than 7% may indicate a problem.

The first place to check is the PCV orifice external port on the top of the cam cover. Vacuum should not be present at the port, if so, the cover must be replaced. If not, remove the PCV tube from the intake manifold and tape off the opening. Do the angle readings increase to normal? If so, replace the PCV tube.

Now you need to inspect for the root cause of the failure. Look into the PCV port in the manifold for a small orange tip of the non return protruding into the passage. If this tip is not visible, the non return valve is either missing or not seated which has damaged the other components from excessive vacuum and the manifold itself must be replaced.

If your angle readings still have not returned to normal, there is still a possibility of porosity in the PCV passage in the cylinder head. Check the crankcase pressure at the dipstick tube. It should read from -11 to -18 in. of water. If the reading is higher, the cylinder head passage must be tested for porosity.

James from Florida

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