Timing belt
Moderator: RichardW
Timing belt
Hello everyone can you help please my C5 is very rough on a cold start but once hot carms down, could this be the cambelt as this was changed when I bought the car and I don't remember the car doing this when I took it for a test drive
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Glow plugs, air in fuel lines, timing* - all non events on HDis.
Is it actually a HDi though? Could be a petrol where the CTS has gone AWOL
* Although the pump doesn't need to be timed, the camshaft does, but it's pretty difficult to get that wrong - most errors on XUD timing come on dropping a tooth on the pump. Anyway, it doesn't really sound like cam timing to me.
Is it actually a HDi though? Could be a petrol where the CTS has gone AWOL
* Although the pump doesn't need to be timed, the camshaft does, but it's pretty difficult to get that wrong - most errors on XUD timing come on dropping a tooth on the pump. Anyway, it doesn't really sound like cam timing to me.
Richard W
By rough - do you mean it makes strange noises but runs Ok otherwise - or basically isn't running on all cylinders?
If its just making noises it may be that the auxilliary drive belt isn't tight - which is more likely if the cambelt has been changed as I expect it was removed for this. Othe possibilities are noisy tensioner pulleys (get sorted before they disintegrate)
Also worth checking the crankshaft pulley - 2 possibilities here - first is that the bolt in the centre isn't tight - second is that the bonded pulley has - er - become unbonded. - check by making a mark accross the bonding - take for a run and see if the 2 parts have shifted - ie is the line straight!
If its just making noises it may be that the auxilliary drive belt isn't tight - which is more likely if the cambelt has been changed as I expect it was removed for this. Othe possibilities are noisy tensioner pulleys (get sorted before they disintegrate)
Also worth checking the crankshaft pulley - 2 possibilities here - first is that the bolt in the centre isn't tight - second is that the bonded pulley has - er - become unbonded. - check by making a mark accross the bonding - take for a run and see if the 2 parts have shifted - ie is the line straight!
jeremy
timing belt
Sorry guys forgot to tell you which engine I have it's 2.2 hdi theproblem is not so much noise more the fact of when you start on cold mornings the car sits there and you are bouncing with it ( not alot but enough to make you think is something wrong ) .I had a diesel mondeo a few years ago and had the cambelt done which came back with the same symptoms and on looking into it if the engine and the pump are slightly out when fitting the cambelt (by about 2mm ) this would cause the engine when starting from cold to sound like a tractor .I don't know if on the 2.2 HDI the pump is run from the engine by another belt ( like ford ) but if so could this be why the car starts like that .
P.S once hot it runs okay
Curly (First time Cit owner)
P.S once hot it runs okay
Curly (First time Cit owner)
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As RichardW pointed out, the high pressure fuel pump is driven by the cambelt but relies on a camshaft position sensor to syncronise the fuel injections, so it does not need timed.
Could it be water temperature sensor thinking it is already warm on startup? - See
http://www.christiantena.pwp.blueyonder ... operation/ high pressure pump section
Could it be water temperature sensor thinking it is already warm on startup? - See
http://www.christiantena.pwp.blueyonder ... operation/ high pressure pump section
2.2HDI has a common rail fuel injection system whih means that the timing is controlled by the ECU operating electric injectors - this has all sorts of advantages - like enabling phased injection - 3 pulses to get rid of the familiar knock when cold etc.
The timing is triggered by a sensor from the crankshaft (flywheel?). There is no injection pump powered by the cambelt. There is ahigh pressure injection pump and a low pressure lift pump at the tank.
The timing is triggered by a sensor from the crankshaft (flywheel?). There is no injection pump powered by the cambelt. There is ahigh pressure injection pump and a low pressure lift pump at the tank.
jeremy
timing belt
Thanks Jeremy and all, so if the cambelt does not affect the timing what could the problem be as the car ran fine when I first saw it, could something have been disturbed while cambelt was being changed? also I read on another post that if the cambelt had been put on wrong you would have a lack of power ? if so I can honestly say my car goes like s**t off a shovel so that means it is not the cambelt.
Do you think I'm being a little paranoid about it because once the car is warm it seems to run fine.
Do you think I'm being a little paranoid about it because once the car is warm it seems to run fine.
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even though the pump is not driven by the cam belt
The point I was really trying to make is that the HDi engines do not have the mechanical belt driven injection pump
Am I missing something here! I'm looking at Autodata's pages on the C5 2.2D HDI and the cambelt clearly goes round the Crank, WP, Tensioner, Cam pulley, Fuel pump and idler pulley. Notes do state that the pump doesn't need timing.
The point I was really trying to make is that the HDi engines do not have the mechanical belt driven injection pump
Am I missing something here! I'm looking at Autodata's pages on the C5 2.2D HDI and the cambelt clearly goes round the Crank, WP, Tensioner, Cam pulley, Fuel pump and idler pulley. Notes do state that the pump doesn't need timing.
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1998 1.5 Saxo
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