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05 Trailblazer idles rough and stalls

07-03-2009, 03:42 PM
I have an 05 4x4 trailblazer that idles rough and stalls when the vehicle is turn sharply or if the a/c is turned on. Vehicle has a jumping feeling when put in drive or reverse. Receive code (P0301 Cylinder 1 Misfire Detected) when diagnosed. Freeze frame data as follows:
Freeze Frame Information (javascript:ToggleElementDisplay('freezeFrameTable ');%20ToggleExpandButton('freezeFrameTableImage')) Parameter Description Value DTC for which Freeze Frame was Stored P0301 Fuel System 1 Status Closed Loop Fuel System 2 Status Not Supported Calculated LOAD Value 81.96 % Engine Coolant Temp 167.00 F Short Term Fuel Trim - Bank 1 -7.81 % Long Term Fuel Trim - Bank 1 8.59 % Intake Manifold Absolute Pressure 18.95 inHg Engine RPM 1,490.00 rpm Vehicle Speed Sensor 9.32 mph Ignition Timing Advance #1 Cylinder 23.00 Intake Air Temperature 118.40 F Absolute Throttle Position 30.98 % Commanded Secondary Air Status Atmosphere / Off

07-03-2009, 03:43 PM
Only work i have performed so far have been a throttle body cleaning and spark plugs have been replaced.

07-03-2009, 07:29 PM
Pull #1 plug see what it looks like, did this start before or after the work was done?

07-04-2009, 02:31 PM
Vehicle had problem before changing plugs just was not as severe as it is now. Plug #1 had the normal signs of an old plug but nothing that showed any other problems.

07-04-2009, 04:10 PM
Without actually looking at the truck, does it have a low speed misfire like a bad plug? If so confirm the #1 coil is working, switch it with another cyl see if the misfire code moves with it, also if it has a dead misfire and the coil and plug are good, a compression test is in order.

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