Disclaimer
The community here at 355nation.net urges you to please use caution and seek professional assistance when performing modifications to your vehicle. Before attempting any modification it is advised that you refer to your Colorado or Canyon service manual or contact a certified mechanic as not all GMT355 trucks are the same. The staff and the associated members are in no way responsible for any damages, injuries or other harm inflicted to your vehicle or yourself which may result in attempting these modifications. The posts and content presented on this site reflect in no way the views of 355nation.net or it’s ownership.
The Following is a GM direct letter to owners of the Colorado's and Canyon's listed years 04-06, both 4 cylinder 2.8L and 5 cylinder 3.5L trucks. Breakdown of specific Vin inclusion as follows.
Note: This condition may be diagnosed through several DIY methods.
(1) let the truck sit at idle for about 30min. if equipped with aux. and access. equipment such as A/C, systems, lights ect. Enable all. Observe trucks idle; a rough idle should lead to further diagnosis.
(2) A compression check can be used, though more invasive than a cylinder leak-down test. Either will work. Observe compression/pressurized cylinder for a decline in pressure within, be sure the cylinder is at TDC on the compression stroke as you are testing it.
***WARNING*** If you are not experienced in performing these tests bring you truck to a dealer, leave it to them. It is free as covered in attached Scans of the GM direct Recall, and letter to owner.
LETTER TO OWNER
RECALL INFORMATION
V.I.N. Locations are on various parts of our trucks. the simplest to find is underneath the glass, by the drivers side of the windshield; If difficult to read as it sometimes becomes, another copy of the VIN is on the inside of our drivers side doors. I believe a third is also in the Glove Compartment where our vehicle specific information is held.
The community here at 355nation.net urges you to please use caution and seek professional assistance when performing modifications to your vehicle. Before attempting any modification it is advised that you refer to your Colorado or Canyon service manual or contact a certified mechanic as not all GMT355 trucks are the same. The staff and the associated members are in no way responsible for any damages, injuries or other harm inflicted to your vehicle or yourself which may result in attempting these modifications. The posts and content presented on this site reflect in no way the views of 355nation.net or it’s ownership.

The Following is a GM direct letter to owners of the Colorado's and Canyon's listed years 04-06, both 4 cylinder 2.8L and 5 cylinder 3.5L trucks. Breakdown of specific Vin inclusion as follows.
Note: This condition may be diagnosed through several DIY methods.
(1) let the truck sit at idle for about 30min. if equipped with aux. and access. equipment such as A/C, systems, lights ect. Enable all. Observe trucks idle; a rough idle should lead to further diagnosis.
(2) A compression check can be used, though more invasive than a cylinder leak-down test. Either will work. Observe compression/pressurized cylinder for a decline in pressure within, be sure the cylinder is at TDC on the compression stroke as you are testing it.
***WARNING*** If you are not experienced in performing these tests bring you truck to a dealer, leave it to them. It is free as covered in attached Scans of the GM direct Recall, and letter to owner.
LETTER TO OWNER

RECALL INFORMATION




V.I.N. Locations are on various parts of our trucks. the simplest to find is underneath the glass, by the drivers side of the windshield; If difficult to read as it sometimes becomes, another copy of the VIN is on the inside of our drivers side doors. I believe a third is also in the Glove Compartment where our vehicle specific information is held.