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Robert, Peugeot Technician
Category: Peugeot
Satisfied Customers: 4708
Experience:  Fully qualified 19+yrs exp/self employed technician in the UK
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heard a very loud knocking noise similar to an air lock in

Customer Question

heard a very loud knocking noise similar to an air lock in a water pipe and clanking thought engine was going to blow mechanic said no obvious signs without hearing the noise its hard to tell you whats up Peugeot 206 1.4 hdi 2001 92,0000
Submitted: 4 years ago.
Category: Peugeot
Expert:  Robert replied 4 years ago.

Hopefully I can help..

When roughly does this noise seem to occur mostly?

During the issue did you notice any problems with the engine running performance or anything in regards to gear changing etc?

Any warning lights come on during or after the fault?

Have had any recent work done on the car prior to this issue?
Customer: replied 4 years ago.

no just sitting in traffic sounded like its in engine mechanic couldn't hear noise so couldn't diagnose he said engine looked fine

Expert:  Robert replied 4 years ago.

Hi..there sorry for the delay..and getting back to me..


Ok..Usually with any sort intermittent noise those are usually the hardest to diagnose really..With such noise as you describe the usually areas to check would be for any loose wise around the engine bay metallic maybe exhaust heatshields as such up at the front end of the engine itself..or anything missing long as nothing is actually at fault in regards to the timing belt pulleys etc.the auxillary belt and pulleys on that ..I cant see it being anything mechanical in regards to the engine itself as i would imagine the fault you describe would be evident all the time..if its coolant system related then of course too that would be evident aswell with the engine having overheating issues i would imagine also..maybe have them inspect the engine mounts might one area to consider.the security of the exhaust system/and heat deflector shields and or any obvious problems suspension wise on the front..if the car has air conditioning then maybe switch that on and see if that produces the noise maybe due to a fault air con pump clutch pulley thats one thing to maybe try and see if that shows up anything.maybe check the radiator fan to be sure that not the culprit /maybe during sitting in traffic "depending how long your where sitting in it of course" that may of kicked in,,so certainly have check of that too - without any exact location as such or any obvious knock on effects from this problem as far as you can tell yourself its generally going to be hard to pin it im amybe have a check of the few things above if it hasnt been done so already..i do hope this helps..If you need to ask anything else or include further info then just continue before you rate..