lanciamatt Posted November 18, 2018 Share Posted November 18, 2018 I'm putting this out there. I've got a dedra turbo that has very high hydro carbons, CO is fine. Checked compressions they are OK, it runs fine. But it won't idle when cold. I've cleaned out idle control valve and swapped it to no avail. If ign on and you plug idle valve in it pulses but nothing happens when it's running, I'm thinking this could be something to do with it? Link to comment Share on other sites More sharing options...
sierraman Posted November 18, 2018 Share Posted November 18, 2018 I don’t know a great deal about lancias but does it use more oil than it should? I know they use a bit of oil but is it smoking or leaking it past the valve stems? The idle and the (presuming) test fail on excessive hydrocarbons might not be related. Link to comment Share on other sites More sharing options...
pilninggas Posted November 18, 2018 Share Posted November 18, 2018 Duff plugs and leads? Link to comment Share on other sites More sharing options...
lanciamatt Posted November 18, 2018 Author Share Posted November 18, 2018 All service parts changed, doesn't really use oil no smoke, boosts good Link to comment Share on other sites More sharing options...
M'coli Posted November 18, 2018 Share Posted November 18, 2018 Temperature sendor dodgy? It won't idle when cold, and over-reads when warm might be due to the ECU using a default value that pleases neither.Can you find a way to spray petrol or suchlike into it on idle when cold, to mimic enrichment?Other than that it could be shonky injector spray pattern. Barry Cade 1 Link to comment Share on other sites More sharing options...
pilninggas Posted November 18, 2018 Share Posted November 18, 2018 All service parts changed, doesn't really use oil no smoke, boosts gooddo the sparks look good? Link to comment Share on other sites More sharing options...
richardthestag Posted November 18, 2018 Share Posted November 18, 2018 when I had unexpectedly high hydrocarbons but everything else was ok it was down to a lean fuel mixture. This was caused by a shit reproduction air filter that was so dense that air couldnt easily get through it. took a while to id the root cause. Link to comment Share on other sites More sharing options...
Squire_Dawson Posted November 18, 2018 Share Posted November 18, 2018 What is your driving style? Would an Italian tune-up work I wonder. Link to comment Share on other sites More sharing options...
M'coli Posted November 18, 2018 Share Posted November 18, 2018 Can we go back a bit, please? Let's establish what year the Dedra is, and what injection system it has.1. What's the injection system?2. What's the ignition system?3. As in, who makes them both?4. Does it have a lambda or cat?5. What codes is it flashing up, if any? I have a Haynes BOL on pre-OBD ECUs if it helps. Link to comment Share on other sites More sharing options...
lanciamatt Posted November 18, 2018 Author Share Posted November 18, 2018 It's multipoint made by webber and magneti marelli. It's pre cat no lambda and no managment light Link to comment Share on other sites More sharing options...
lanciamatt Posted November 22, 2018 Author Share Posted November 22, 2018 I think ive solved the idle issue when cold. When ign on engine off there is 12v to idle valve, when engine running it looses the 12v.i power probed the wire with 12v and hey presto it started working. I managed to get a wiring diagram and the fuel pump relay has a 2nd 87 pin, this is the output for the idle valve. I had a route round in garage and found a 5 pin relay, popped it in and now working. Will try it again in morning when cold. It looks like the system has a 12v constant feed and the ecu uses PWM signal on the earth side to control it Ohdearme 1 Link to comment Share on other sites More sharing options...
tul66 Posted November 22, 2018 Share Posted November 22, 2018 Well done! Not a fan of Dedras though. Link to comment Share on other sites More sharing options...
Uncle Jimmy Posted November 22, 2018 Share Posted November 22, 2018 The Fiat twin cam is a dirty bugger and likes a drop of oil, sounds like you're on the right track with pcp valve/over fueling. Link to comment Share on other sites More sharing options...
lanciamatt Posted November 23, 2018 Author Share Posted November 23, 2018 I know what you mean with dedras, it's not lancias finest hour. They are nice to drive, handle like go carts and its quick Link to comment Share on other sites More sharing options...
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