C3 2003 - Hdi

[cpdavis]

Could any citroen expert point me in right direction to investigate cause of what appears to be knocking under the floor, (like drumsticks) when car is either slightly laboured or slowing down and remaining in too higher gear. First suspision was exhaust, but this is original and fixed correctly.I have also eliminated other possible causes, engine undertray, engine top cover, batttery surrounds but the noise persists. It is very difficult to hear if the noise is from the front or rear of car. Driving normally the car is smooth and quiet. I have also checked the spare wheel and tools are secure.

 

Any suggestions greatly received. Regards, C Davis :D

[iannez]

check the counter weight on top of the gearbox linkage.

[cpdavis]

check the counter weight on top of the gearbox linkage.

Jannez,

 

Thanks for this info, please could you inform how I gain access . - what dismantling is required to gain view of this area? Is this under bonnet, below battery or by removing central console. Many Thanks, Colin.

[techbod]

seen this on an audi diesel and it turned out to be vibrating AC pipes in cowling so check all the piping is secure so nothing vibrates,

 

other thing to consider is the heat shield on the exhaust they are a pain for doing that.

[iannez]

remove the air intake pipe next to the battery and you should be able to see it. its on top of the gearbox towards the bulkhead. the bolt snaps and it falls against the gearbox bellhousing.

[cpdavis]

remove the air intake pipe next to the battery and you should be able to see it. its on top of the gearbox towards the bulkhead. the bolt snaps and it falls against the gearbox bellhousing.

 

Hi, Jannez,

 

I have identified and checked out this part and all seems OK. Also the heat shields mentioned in previous post, these are all secure. This noise is prevalent when driving at an indicated 32mph in fourth gear, which is slightlly below comfotable threshold for this speed /gear, as well as conditions in OP.

I am currently having to drive about 1000 miles a week due to work issues, and whilst this problem is not getting worse, I am quietly hoping the offending item will drop off, so it can be fixed/replaced.

Thanks for your help any futher suggestions greatfuly received, or it looks like I will have to be looking at getting a newer one. This will frighten moths out of my wallet when opened. :unsure: Regards, C Davis.

[iannez]

try and wedge the airbox with something. there are 2 locator pegs in the bottom of the air box that fit into 2 rubber mounts. if one of the rubber mounts gets pushed through or is missing the air box rattles at low revs. the air box is a pig to get out. i put a jack under the sump, remove the engine mount and pull the engine forward for better access. remember to use a block of wood on the jack to protect the sump if you do it this way.

[cpdavis]

With regard this ongoing issue, I have acted on all suggestions offered and also had car fully inspected by MOT inspector on ramp with wheel free. No problems found and would pass MOT as long as other items ok - which they are.

 

This leads me to think this noise must be internal within transmission. I am thinking it could be the clutch, although this appears to work correctly with good selection and no slipping.

 

Could anyone advise if this car would have a dual mass flywheel (poss cause of vibration?) and the likely cost of changing this item and also full clutch assy. I think I would prefer to entrust this work to a citroen dealership.

 

Many thanks in anticipation.