well,i just pickd my truck up for the second time this month for p0014 and p0017 codes and a rough idle, i make it about 1/2 mile down the road and the idle starts surging again and the engine light comes on. so i got home tonight and did some searching around and found that excessive crankshaft endlplay can cause this problem. my truck is a 2004 with 24,000 miles. heres a TSB i found
Document ID# 1809533
2004 Chevrolet Colorado Pickup - 2WD
Subject: Rough Idle with DTC P0014 and/or P0017 - Inspect Cam Actuator Solenoid Screens and Crank End Play
Condition/Concern:
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:
http://service.gm.com/engif/000/001/752/1752543.gif
(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.
If the crankshaft end play is obviously out of specification, inspect the engine block for damage due to contact with the crankshaft. If engine block damage is present, contact the PQC (Product Quality Center) at 1-866-654-7654 for engine replacement authorization.
If there is no engine block damage present, disassemble the engine and inspect the following components for damage due to thrust bearing debris in the engine oil: all bearings, all journals, all valvetrain components, all timing components, and the crankshaft
Then, estimate what it will cost to replace the oil pump, camshaft actuator solenoid, all damaged parts, and to completely disassemble the engine to thoroughly clean all of the cylinder head and engine block oil galleys with oil galley brushes and soapy water.
After the repair estimate is complete, estimate what it would cost to replace the engine and contact the PQC to review these estimates as outlined in 02-07-30-029F.
Important: On 2006 models with excessive crankshaft end play, please submit a field product report by following 02-00-89-002D.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
Document ID# 1809533
2004 Chevrolet Colorado Pickup - 2WD
Subject: Rough Idle with DTC P0014 and/or P0017 - Inspect Cam Actuator Solenoid Screens and Crank End Play
Condition/Concern:
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:
http://service.gm.com/engif/000/001/752/1752543.gif
(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.
If the crankshaft end play is obviously out of specification, inspect the engine block for damage due to contact with the crankshaft. If engine block damage is present, contact the PQC (Product Quality Center) at 1-866-654-7654 for engine replacement authorization.
If there is no engine block damage present, disassemble the engine and inspect the following components for damage due to thrust bearing debris in the engine oil: all bearings, all journals, all valvetrain components, all timing components, and the crankshaft
Then, estimate what it will cost to replace the oil pump, camshaft actuator solenoid, all damaged parts, and to completely disassemble the engine to thoroughly clean all of the cylinder head and engine block oil galleys with oil galley brushes and soapy water.
After the repair estimate is complete, estimate what it would cost to replace the engine and contact the PQC to review these estimates as outlined in 02-07-30-029F.
Important: On 2006 models with excessive crankshaft end play, please submit a field product report by following 02-00-89-002D.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
