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Hesitation After Timing Chain Replacement
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Default Hesitation After Timing Chain Replacement - 27th April 2016, 07:58 AM

Hi all,

I had my timing chain replaced about a month ago and ever since I have experiences an intermittent hesitation, which is usually most apparent in low revs, second gear, cold engine when accelerating. Over the weekend I took the intake manifold off and gave the inlet valves a good mechanical clean and the problem still persist. When I got the chain replaced the garage did say that they amended the timing ever so slightly. I took it back to the garage once and they said they couldn’t find a fault (no misfire codes stored etc). Has anyone else had an issue like this and could it be due to a ‘super-knock’ issue?

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Default 27th April 2016, 08:55 AM

Hello.
Did they install a full timing kit inc vvt sprocket or just guides, chain and tensioner. I am going to install the kit myself and was not aware that the timing could be tuned via the timing being replaced. I do know that theres only one way the kit can be installed and it has no room for errors.
  
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Default Hesitation After Timing Chain Replacement - 27th April 2016, 09:45 AM

Could be something else as well. HPFP perhaps



  
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Default 27th April 2016, 09:51 AM

As far as I am aware they just replaced the chain, tensioner and guides. I spoke with a friend of mine who works at BMW and they said that it could have been amended very slightly (by 1 tooth) and this COULD have caused the problem. They stressed the absolute importance of locking the cams and crank in place whilst doing this job, so make sure you have the right tools!

As well as the hesitation, the car does seem to have lost some of its urgency when hitting the turbo powerband.... Very odd!
  
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Default 28th April 2016, 05:04 PM

Ok so I have done some more reading up on this. Took the valve cover off and physically looked at what was going on. Turned the crank over until the writing was visible on the cam shafts. Question, is it correct that both of the cam lockers (not too sure what they are called) should be flat? In my case they were slightly sloping away from each other... You can see in the picture that the intake cam isn't as far through the rotation as the exhaust. Anyone else had a similar experience?

  
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