HDi EGR Valve or Turbo

Unread post by **citroenxm** » 29 Dec 2010, 11:22

Hi All..

Subject: HDi 110bhp, Xantia

Ive got a Xantia 110bhp HDi here, I have found that if I undo the EGR valve the engine will run etc.. however, ifI tighten it up the engine wont run, and starts and stalls immidieatly..

I bought the car with a suspect turbo problem, so my Q is, is this an EGR problem, or is there a Turbo blockage causing the gasses to go in the direction of the EGR?

Paul

Unread post by **CitroJim** » 29 Dec 2010, 12:15

Paul, if the engine only runs with the EGR valve loose then this suggests a big blockage, the engine is breathing via the loose valve. If under these conditions the EGR valve is acting as an air inlet then the is a blockage 'twixt the air filter and the inlet manifold.

If there are exhaust gases coming out of the valve then the exhaust is blocked, maybe at the cat. It's not unknown for a cat to collapse totally and block itself up. Don't be too quick to condemn the turbo. It could be something as simple as a collapsed hose between the turbo and intercooler.

Brigsygtt · Unread post by **Brigsygtt** » 29 Dec 2010, 13:52

Im with Jim on this one, ive absolutely destroyed turbo's in the past and the engine will still run fine albeit slowly & smokey.

Drop the exhaust off and run it, if the turbo's goosed oil might have blocked the cat.

Unread post by **citroenxm** » 29 Dec 2010, 16:01

Ah, good point, I didn't get as far as dropping the exhaust off, I dropped it off the head with manifold firstly, then found it ran, so bolted the manifold and turbo back up, and it stopped, so I undid the EGR and it ran again....

Ill try the exhaust next, Its NOT a intercooler pipe they are all in good shape.

Thanks
Paul