CLS63 AMG Timing issue
04-28-2018, 09:20 AM
#1
Junior Member
Thread Starter
CLS63 AMG Timing issue
Good day to all:
Hoping to get some advice;
2012 CLS63 AMG
Car was running fine, but at times starting it would take 3 or 4 times longer (as far as cranking over). then at times fired on the first turn. (CEL P0018) it would at times lose power at high end, but idle was smooth and ran without issue. I took it to the MB dealer and they said it "spun the timing plate on the camshaft and that needed to be replaced. I bit the bullet ($4,000) and had the camshaft replaced, they called me a few days after and said it now had a fairly bad misfire at idle, however, that it would go away after 3,000 RPM and that the timing was fine now, but misfire was not going away. Next day after trying to resolve the misfire they called me and said "oh, you also have a bent valve on #7. I informed them that it ran fine prior to coming in there and never had any misfire, they said it was bent just enough that when they took the original camshaft out it, that valve now will not seat correctly. And I would need to replace the head entirely with new valves ($9,500.00 Parts and labor)) because the engine must be pulled to remove head. Would the valve have been damaged by removing and replacing the old camshaft? As stated before, never a misfire and ran fine, timing did seem off at times and CEL was constantly coming on. Tech said he was so frustrated that he removed and replaced the CAM 3 times before determining the valve was bent with a leak down test. Any advice, insight would be very much appreciated. Thank you!
Also, if a valve is bent, would that require a NEW head from MB at a cost of over 5K? Wouldn't you be able to replace just the bent valve?
Hoping to get some advice;
2012 CLS63 AMG
Car was running fine, but at times starting it would take 3 or 4 times longer (as far as cranking over). then at times fired on the first turn. (CEL P0018) it would at times lose power at high end, but idle was smooth and ran without issue. I took it to the MB dealer and they said it "spun the timing plate on the camshaft and that needed to be replaced. I bit the bullet ($4,000) and had the camshaft replaced, they called me a few days after and said it now had a fairly bad misfire at idle, however, that it would go away after 3,000 RPM and that the timing was fine now, but misfire was not going away. Next day after trying to resolve the misfire they called me and said "oh, you also have a bent valve on #7. I informed them that it ran fine prior to coming in there and never had any misfire, they said it was bent just enough that when they took the original camshaft out it, that valve now will not seat correctly. And I would need to replace the head entirely with new valves ($9,500.00 Parts and labor)) because the engine must be pulled to remove head. Would the valve have been damaged by removing and replacing the old camshaft? As stated before, never a misfire and ran fine, timing did seem off at times and CEL was constantly coming on. Tech said he was so frustrated that he removed and replaced the CAM 3 times before determining the valve was bent with a leak down test. Any advice, insight would be very much appreciated. Thank you!
Also, if a valve is bent, would that require a NEW head from MB at a cost of over 5K? Wouldn't you be able to replace just the bent valve?
Last edited by AMG80138; 04-28-2018 at 11:46 AM. Reason: add info
