Sootysevener Posted January 11, 2003 Share Posted January 11, 2003 Hope someone can relieve me of my confusion!. I have a 1989 S3 1700 Xflow which keeps hunting at tickover. When I bought the car it was running on NGK 8 plugs which were too colld given the limited time the car spends with plugs at self cleaning temperature - I live on Guernsey so road space is limited and with a 35mph speed limit and granite hedges on narrow roads. Ive made numerous changes Plugs changed to 7s then 6s Lumenition kit and coil fitted Magnecor leads 40DCOEs professionally set up and balanced The car runs like a dream with clean plugs - still manages sub 5.5 secs to 60 but the tickover set to 800 rpm hunts upto 1500 revs and varies 1300/1500 when up to normal temp. The camshaft was replaced with a fast road cam just before I bought it as it had suffered the perrenial problem of scuffing a lobe on No 4 All in all I now don't know what the problem could be - Any ideas? David Link to comment Share on other sites More sharing options...
Roger King Posted January 11, 2003 Share Posted January 11, 2003 This is often caused by poor carburettor set up, both balance and idle mixture. As a very rough (and unscientific) rule of thumb, an engine with well set up carbs will not slow down when the fan kicks in, but if things aren't right in this area the extra load on the alternator is often sufficient to slow the engine by 100 - 200rpm. Link to comment Share on other sites More sharing options...
chrissy h Posted January 11, 2003 Share Posted January 11, 2003 no one else need reply ......the master hath spoken Link to comment Share on other sites More sharing options...
Roger King Posted January 12, 2003 Share Posted January 12, 2003 Ah, but I might be wrong! Link to comment Share on other sites More sharing options...
budgie Posted January 12, 2003 Share Posted January 12, 2003 Yes, carbs not balanced. Link to comment Share on other sites More sharing options...
STEVE GILBERT Posted January 12, 2003 Share Posted January 12, 2003 I like Colortunes...they help you breath more easily! Joking aside they are a handy little window into your engine and top kit for setting idle mixture, get this done, balance the carbs with some accurate kit and then have a rethink. Steve See My Zetec Power 7 Here Edited by - STEVE GILBERT on 12 Jan 2003 20:40:24 Link to comment Share on other sites More sharing options...
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