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I have trailblazer 04 i was driving on high was soddenly and car Hesitate and when i try to accelerate it slow down!!. also sometimes when i lift my feet from gas the car shutdown. the car was week and like i am towing Something. when i checked the engine light i found P0455 and P0171.

i took it to a shop and they replace Cam position sensor but no thing change and the light still on. I waste about 200$ for no thing.

I when to website and youtube and i read a lot finally i found my problem :).....

SOLUTION.

1.  I repair THE Purge valve solenoid.
  cost 30$

the car if now 70% better then before but still when I try to accelerate it is dose not go clearly and Hesitate.
i did next...

2. I cleaned the engine MISFIRE.


3. i replace the fuel filter.   cost 16$

now my car is like completely deferent  and fixed 100%.
i hope i solve your problem.
Vehicle: 2004 trailblazer v6 4.2

1 Answer

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Yes this is correct what happens is the purge gets stuck in the open position and this is why you would also set a P0171 (lean code condition) Chevy has a TSB about this problem here a sample TSB#

#PIP3405: Engine is Hard to Start After Filling the Fuel Tank - keywords controls crank EVAP extended gas long no P0440 P0442 P0446 P0455 purge valve vapor - (Apr 21, 2005)

Subject: Engine is Hard to Start After Filling the Fuel Tank
 

Models: 2004-2005 Buick Rainier
  2002-2005 Chevrolet TrailBlazer
  2002-2005 GMC Envoy
  2002-2004 Oldsmobile Bravada
  with 4.2L Engine (VIN S - RPO LL8)

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.

Condition/Concern

On rare occasions, an extended crank or hard to start condition may be experienced after filling the fuel tank. A SES light with EVAP DTCs may or may not be experienced with this condition. This may be the result of an EVAP purge valve that is not fully seated in the closed position with the engine off.
 

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