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2008 cobalt 202k miles 2.2 ecotec So for a good while I had a dreaded timing chain slap on cold start a second or two, and I decided to attempt changing to the newer and revised timing chain tensioner. I changed the part out yesterday, the super ghetto take it out and put the new one in without opening up the valve cover way (it's -20c here). Initially I had no codes and I thought I had solved the problem - until I started hearing some unpleasant noises. Upon further review I realized I should've made sure that the tensioner was released and doing it's job correctly. That involved me taking it out, and manually putting into the extended state. I re-installed and everything became beautifully quiet and wonderful. Then I got a p0016 code saying the cam/crank were out of sync. From everything I read I anticipated it to run like a dog, or at least exhibit some symptom. Except it didn't.. it runs great. I put it through it's paces and it seems perfectly fine to me. I have an obd reader that gives me some info and the only thing that seems out is the alternator seems to be putting out 15 - 15.5 v which I find very odd. Cliff notes: New timing chain tensioner, throws a p0016 crank/cam out of correlation, but still runs fine but the voltage output from the alternator seems high 15.5v area... I'm confused!
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Jan 7, 2018 20:48
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| # ? Apr 30, 2024 07:55 |
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If it's not out of time you will need to find someone with a oem/professional scan tool to perform a cam/crank correlation relearn procedure.
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Jan 8, 2018 05:34
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Clear the codes, see if they come back. Also, low oil pressure, dirty oil, or a failed VVT solenoid will also cause that code if you have the VVT version of the 2.2. A 2008 may or may not have that engine, depending on the build date. Are there two plugs + solenoids on the valve cover right by the hump for the timing chain (in addition to the four ignition coils)? Check the voltage with a multimeter, at the jump post under the hood (use one of the strut tower bolts for the ground). If it's really putting out 15+V, you're gonna murder batteries quickly. Might try checking voltage at the battery itself too. I also need to replace the timing chain tensioner on my car (2006 Saturn Ion, 2.2 Ecotec).  Keep putting it off, but it's rattling on every cold startup and on a lot of warm startups now.
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Jan 8, 2018 06:28
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