Mechanics

CHEVY POOR IDLE

2005 Chevrolet Colorado

Engine Performance problem
2005 Chevy Colorado 4 cyl Two Wheel Drive Manual 50000 miles

the engine has very poor to no idle 500-700rpm
codes come up p0300, p0017, p0101, p0506
it all started after a fuel up, bad fuel? Or is it a sticky valve spring. After some time the reduced power signal comes up with no power to the eng.
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Mike pro
January 25, 2009.




Here is some info, On rare occasions, a rough idle may be encountered with a P0014 and/or P0017 DTC. Due to the rough idle, a P0106 DTC may be stored too. This concern may be due to debris in the camshaft actuator system, which may be caused by a missing camshaft actuator solenoid screen or a worn crankshaft thrust bearing. Typically, this is the result of a camshaft actuator solenoid concern. If this is due to a worn crankshaft thrust bearing, some customers may also comment on a drive belt noise.

Recommendation/Instructions: If this concern is encountered, follow the SI diagnostics and repair as necessary. If the SI diagnostics do not isolate the cause of this concern, ensure that camshaft actuator solenoid screens 1, 2, and 3 are in place as shown below: (1) Screen for Advance Pressure to Camshaft Actuator
(2) Screen for Pressurized Oil from Oil Pump
(3) Screen for Retard Pressure to Camshaft Actuator

If any of these screens are missing, replace the camshaft actuator solenoid, change the engine oil and filter, and evaluate the concern.

If all these screens are present, measure the crankshaft end play to determine if it is within the specification of 0.0044" - 0.0153" (0.112 - 0.388 mm). Typically, if excessive crankshaft end play is causing this concern, it will be obviously out of specification by.050" or more. If crankshaft end play is within specification, replace the camshaft actuator solenoid. For the p0506 clean the throttle body. Post back with any other questions.
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Brian 1
Jan 25, 2009.


http://www.2carpros.com/forum/automotive_pictures/147643_valve_1.jpg


Brian 1
Jan 25, 2009.

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