veloce200 3 Posted September 27, 2006 Hi there I know a lot of track people run open breathers which is fine flat out but not good for part throttle use as all the crap in the crankcase tends to stay in the crankcase. so most cars have a pcv valve somewhere - thing is can't find it on the Pug anywhere ? Anyone know ? thanks Julian Share this post Link to post Share on other sites
Grim.Badger 15 Posted September 27, 2006 Link Doesn't have one, apparently, and I've never come across one (although I have to admit I'm not sure I'd know I was looking at one ) Share this post Link to post Share on other sites
pug_ham 242 3 Cars Posted September 27, 2006 I think I've seen one on a Motronic 205 GTi but never on a Jetronic one. Certainly not on any of the Jetronic engines or cars I've worked on or stripped. Graham. Share this post Link to post Share on other sites
Emmy Seize 8 Posted September 28, 2006 Look out for the purge canister under the left front wing. If there is none, your car is unlikely to have a pcv. As has been said before, these systems are found on Motronic cars, not on Jetronic ones. Number 18 in the picture is the pcv. Share this post Link to post Share on other sites
welshpug 1,627 Posted September 28, 2006 aaah! wondered what the big canister thing was in my 405's left front wheelarch just behind the foglamp! Share this post Link to post Share on other sites
jim21070 2 Posted September 29, 2006 Backalong, a PCV Valve was a Positive Crankcase Ventilation valve. It was positioned between the rockerbox (usually) and the inlet manifold to allow crankcase fumes to be sucked into the inlet manifold to be burned. It was, in fact, the original emission control measure, introduced in 1963 when it was mandated that crankcase fumes (which have very high CO levels) must not be vented to air. The PCV valve itself was designed to ensure that under idle conditions it would be closed and thus not upset idle quality by allowing too much air into the inlet manifold. Share this post Link to post Share on other sites
Emmy Seize 8 Posted September 29, 2006 (edited) Jim is right, the valve I mentioned is not the one we are looking for. Crankcase ventilation on the XU engines happens (as far as i was able to find out) via the hoses that are attached to the oil filler. I checked cars with both systems (Jetronic and Motronic) and did not find any sort of valve in the lines. As Jim said, this is just an emission control measure, so using open breathers shouldn´t affect the engine running at any point as long as you block off the hoses leading to the inletmanifold properly. Edited September 29, 2006 by Emmy Seize Share this post Link to post Share on other sites
