Timing Chain Tensioner or Guides Bad, but Car Runs Fine. Do I Need a New Car?
I have a 2007 Cobalt LS, manual trans, with 137K miles. I noticed a bad rattle in the motor when I start the car yesterday, and the rattle has been constant. Other than the rattle, the car seems to run fine. The RPMs at idle and speed are normal. The engine starts and stops smoothly. In other words, everything but the engine's sound seems normal. I brought the car to the shop today (I've used them for a long time, and they've been trustworthy), and they told me that the timing chain tensioner or guides are bad. They said I'd need a new engine, so it's just time for a new car. Since the car runs normally other than the sound, do you think they might be jumping the gun when they say that the engine needs to be replaced? If the timing chain was slapping around like they said, wouldn't I be seeing issues with acceleration, RPM, and that kind of thing? Should I get a second opinion before getting a new car? The mechanic advised me to just carefully drive the home since I live nearby, then not drive it anymore.
Even if the timing chain situation might be more salvageable than they're saying, it might be better at this point to get a new car anyway. At 137K miles, I'd probably be running a high risk of my clutch or something going soon after I sink several hundred dollars into this repair. That's always a tough call, but I'm still interested to hear your opinion on my mechanic saying the engine was shot when everything seems fine other than the noise.
Last edited by Lou; 11-15-2017 at 03:26 PM.