406oc.co.uk

Hi all, I am going quietly nuts here. I have a Haynes book for my 406 1.8 LX and they don't call them the Haynes book of fibs for nothing. Apparently 406's don't have PCV valves? Really Haynes really?

I am getting blow-by up through the oil filler and a slight knocking under throttle (hills etc), I have replaced the re-breather from my previous post and though improved it's still not running right.

Can someone be kind enough to explain where to find the PCV? Also can it be cleaned or is it a replace job?

Many thanks......

I'm not seeing anything that looks like one in the diagrams, neither is a search bringing anything up (but who knows what PSA call it ) One thing that might help is I don't know which 1.8 I'm meant to be looking at - there are 4

Hi, I'm not sure either but maybe try the FCF ( French Car Forum ) as the Citroen Xantia / Picasso etc is also available as a 1.8, maybe some answers on there if no-one here can help?

Also 306's. (There can't be any part of a 306 someone hasn't modified).

steve_earwig wrote:I'm not seeing anything that looks like one in the diagrams, neither is a search bringing anything up (but who knows what PSA call it ) One thing that might help is I don't know which 1.8 I'm meant to be looking at - there are 4

Oppsie, sorry... It's a Peugeot 406, 2001, Silver (I know being silver probably makes no difference, but as I am learning with my first French car anything is possible.. ) 1.8 Petrol LX. I am assuming the others are diesel? Or are there 4 petrol 1.8's? I also have looked everywhere and can find no reference to it [PCV] anywhere!

GingerMagic wrote:Hi, I'm not sure either but maybe try the FCF ( French Car Forum ) as the Citroen Xantia / Picasso etc is also available as a 1.8, maybe some answers on there if no-one here can help?

Thank you for the advice, someone must have seen one at least once? Maybe 406 PCV valves never go wrong? Maybe......

Doggy wrote:Also 306's. (There can't be any part of a 306 someone hasn't modified).

Sorry to sound a bit daft, but I am not quite sure what you mean? Maybe you could elaborate a bit? Any clues are VERY welcome!

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Thanks all........ the hunt continues. Once I sort this car out I think I am going to take up a easier hobby than fixing a French car..... like teaching thermodynamics of quantum-electrodynamic frequency shifts at M.I.T, y'know, easy stuff.....

PCV valves are always fitted to the cam cover or inlet manifold.

The valve will have a 90 degree elbow with a rubber pipe about 13 to 15mm diameter on it, the other (metal) part will be pushed into a rubber sleeve (grommet).

Sometimes you can test the pcv valve by pinching the rubber pipe and listening for a click which proves it is working.

You can clean out the pcv valve quite easily using brake cleaner.

I haven't seen one on the 1.8 engine, but I've never been looking for it.

A blocked valve or a breather will usually give you a hissing noise or a release of air as you undo the oil filler cap.

jasper5 wrote:PCV valves are always fitted to the cam cover or inlet manifold.

The valve will have a 90 degree elbow with a rubber pipe about 13 to 15mm diameter on it, the other (metal) part will be pushed into a rubber sleeve (grommet).

Sometimes you can test the pcv valve by pinching the rubber pipe and listening for a click which proves it is working.

You can clean out the pcv valve quite easily using brake cleaner.

I haven't seen one on the 1.8 engine, but I've never been looking for it.

A blocked valve or a breather will usually give you a hissing noise or a release of air as you undo the oil filler cap.

Many thanks, no hiss after opening the filler. I am going to replace the filler cap, seems so obvious now, but always think the worse with bleedin engines don't we. I am still convinced the PCV is bunged, when I find it I will use your brake cleaner suggestion. Ta very much for the tips....

I might be wrong here.. but idont think 406s have p.c.v valves.

Keep an eye-on the dip stick normally they will spit the dipstick out if
The engine is. A bad breather..