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#1
22nd October 2013, 05:25 AM
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If the timing belt is loose it's possible it jumped couple of teeth and started misfiring, now it might have jumped couple more and therefore not start at all. If it jumps too much it can end in serious engine damage. At this point I would at least get cambelt covers off and check cambelt for tension and tensioner damper for operation before attempting to start engine again.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure 
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#2
23rd October 2013, 11:44 AM
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Hi There,
The two side covers of the belt were one of the first things off. I popped the middle one. The belt doesn't look particularly loose or bad. All teeth seem to be there and perfect. Turning the belt on the starter and the wheels and marks look to be in the right place. I think you would notice one tooth out, let alone 3 or 4. I don't think that it is the belt. It was changed about 60K ago, which is by no means new, but it also isn't overly old either. Lee
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#3
23rd October 2013, 12:11 PM
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Whay about a problem with the hydraulic variator that controls the valve timing. If that was playing up would the cam timing be far enough out to cause misfires?
If the cars runs ok from cold maybe the oil pressure in the variator is bleeding off when the oild gets hot???
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#5
23rd October 2013, 03:21 PM
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This does seem to have the hallmarks of the valve timing being out. Can you turn the engine over by hand on the crank pulley and see if the holes in the cam pulleys line up? I can't remember if there's a TDC mark on the front cover anywhere (TDC for number 5 cylinder) which is where you lock the crank when you change the cambelt.
However if you can't the 4 holes (actually a hole and a slot on each cam pulley either side of the centre bolt) to line up horizontally like they do when you fit the cam locking bar, then something is definitely out with the valve timing.
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#7
24th October 2013, 11:56 AM
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Hi there,
The cam variator....As in the chain and lifter inside the engine. They were actually changed on both sides. Would seem strange that it has failed / chewed up the shoes in 50-80 thousand miles, possible. However the engine still ran when either of those had died pretty badly. I spoke to a mechanic friend who said it is very rare for a toothed belt to slip and jump. They usually break before that happens Lee
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