Ric Posted December 18, 2006 Share Posted December 18, 2006 Hi all. I seem to have a bit of a problem with my idle on meh car. Basically ive fitted a walbro pump and a thor FCD this weekend, im yet to remove the FCD as a weakest link sorta thing but i thought i would ask for a little advice nevertheless. Ive tried a search for idling problems, faulty FCD's etc have played a part but my problem has a unique twist, Read on. From a cold start the car idles fine at just over 1.2k Take the car for a run untill it gets upto operating temp (everythings fine no misfires, hesitiation, boosts correctly) and come to a standstill, again the car idles fine, at around 7-800 rpm Now, turn the car off, and start again like 5 seconds later the idle is rough, lumpy and hunting from 4-500rpm to around 900rpm, When holding the revs at around 1.5k the exhaust note is lumpy and has a few little quiet booms. Drive the car for a few miles and again the idle is fine, then it loops again. Any Ideas/Tips? or what to check first. (ICV? Plugs?) Thanks In Advance. Quote Link to comment Share on other sites More sharing options...
Homer Posted December 18, 2006 Share Posted December 18, 2006 First thoughts (after my disaster today!), do you have a stock fpr or aftermarket one? Quote Link to comment Share on other sites More sharing options...
Ric Posted December 18, 2006 Author Share Posted December 18, 2006 everything is stock atm. bar an airfilter, new silcone vacume hosing and the walbro + fcd this weekend. Quote Link to comment Share on other sites More sharing options...
Jake Posted December 18, 2006 Share Posted December 18, 2006 Did this problem start immediately after fitting the FCD? Quote Link to comment Share on other sites More sharing options...
Ric Posted December 18, 2006 Author Share Posted December 18, 2006 its done the hunting thing once before but for only a few seconds that was a few weeks ago. Its doing it all the time now, and it defo didnt before fitting the walbro,fcd this weekend Quote Link to comment Share on other sites More sharing options...
Jake Posted December 18, 2006 Share Posted December 18, 2006 I'd start by checking the soundness of the FCD earth connection. I had one that wouldn't work right until I grounded it to a chassis point rather than having it connected to the ECU negative wire. If no joy there then remove it, as you said before. I guess it could also be a Lambda sensor problem, but the problem starting at the same time as the FCD install is too much of a coincidence, innit? Quote Link to comment Share on other sites More sharing options...
Ric Posted December 18, 2006 Author Share Posted December 18, 2006 yeah like i said ive checked a few search results some lean towards a faulty FCD just scoping for ideas before i start ripping away again. Cheers jake ill try the chassis ground for the fcd too Quote Link to comment Share on other sites More sharing options...
Ric Posted December 20, 2006 Author Share Posted December 20, 2006 tried the grounding jake to no avail so the next step was to remove the FCD completely, Problem solved, no irratic idleing sooo a faulty fcd prevails again Thanks guys Quote Link to comment Share on other sites More sharing options...
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