Truck Trend Garage: 2005 Chevrolet Colorado Timing-Chain Replacement Timing
Question: I have a 2005 Chevrolet Colorado with the I-5 engine. It's a great truck with 146,000 miles. Should I replace the timing chain/water pump to avoid a catastrophic failure? I'm concerned that the dealer might create more problems than this may avoid.
Answer: In general, an engine's timing chain isn't considered a maintenance item. But in high-mileage situations, a chain may indeed stretch and cause problems. I don't know of any GM dealerships recommending timing-chain replacement on the 3.5-liter five-cylinder engine, without symptoms. The water pump is another story. The pump is often changed along with the scheduled maintenance of a timing-belt replacement (on non-chain engines). It's often overlapping labor with the timing-belt job (might as well change it while you're in there), and a water pump commonly starts rattling and/or leaking before the belt gives way, anyway. In your situation, there's a little bit of a fail-safe built into the powertrain-control system. When the timing chain on the I-5 stretches to a certain point, the PCM will sense the camshaft-to-crankshaft timing getting out of whack, therefore setting code P0014, and turning on the check engine light. A timing chain can also produce a rattling noise when the excessive slack causes it to bounce off the inside of the timing chain cover or block--another symptom to give you a heads-up before the chain lets go. With that said, don't spend the money until you have to.
If you have a technical question regarding your pickup, SUV, or van, feel free to contact Alex, a master technician with the National Institute for Automotive Service Excellence. Send a letter to him in care of Truck Trend Garage, 831 S. Douglas Street, El Segundo, CA 90245, or e-mail us at firstname.lastname@example.org. Please include the VIN with your question. Due to the volume of questions received every month, we cannot guarantee that everyone's question will be personally answered or will appear in the magazine.
Can't wait for help with a problem you're having with your Truck or SUV? Ask the expert we trust here at Truck Trend Garage -- visit Alex Steele at www.RealWorldAutomotive.com.
2015 Chevrolet Colorado SpecificationsVIEW ALL
|Fair Market Price||$20,040|
|Editors' Overall Rating|
|Mileage||19 City / 26 Highway|
|Horse Power||200 hp @ 6,300 rpm|
|Torque||191 ft lb of torque @ 4,400 rpm|