Axel Arnold Posted June 16, 2003 Share Posted June 16, 2003 Hi, just monted the old orginal air filter for comparing noise with the K&N (a little less noise - just fine for no more ringing in my ears with 4-1 comp. exhaust). But now the rev's are not coming down, hanging at 2000 1/min. After shaking at some parts around the connection of the air filter, it's getting a little better. Most effect when moving the ?-sensor near the butterfly valve: moving away - rev's go up, moving to the valve - rev's go down slowly. Test drive: Still hanging sometimes at atbout 2000-3000 1/min. Any idea? Axel Link to comment Share on other sites More sharing options...
oilyhands Posted June 16, 2003 Share Posted June 16, 2003 You've overtightened the clip holding the air filter, this distorts the (plastic) throttle body and causes the butterfly to stick. Re-adjust the clip to ensure the TB reamins round. Oily Link to comment Share on other sites More sharing options...
Axel Arnold Posted June 16, 2003 Author Share Posted June 16, 2003 Oily, thanks, overtightenig was also my first idia, so loosened the clip nearly totally. Did help a little bit. Will take a look inside the throttle body for the butterfly. You think, the senor is ok? My Revs where comming down quite slowly also before, but had no idea why. The butterfly turns easaly. Axel Link to comment Share on other sites More sharing options...
oilyhands Posted June 16, 2003 Share Posted June 16, 2003 Next suspect is the IACV... Oily Link to comment Share on other sites More sharing options...
Axel Arnold Posted June 16, 2003 Author Share Posted June 16, 2003 IACV? The sensor? How to check? Any chance for a repair? The fast help on this fantastic forum gives good feelings back when 7 is ill Axel Link to comment Share on other sites More sharing options...
oilyhands Posted June 17, 2003 Share Posted June 17, 2003 The IACV (Idle Air Control Valve) isn't a sensor, its a valve which modulates air to the engine in order to maintain the correct idle speed regardless of temperature or load. It is also used to soft-land the engine when the throttle is closed suddenly which has a fasvourable affect on emmissions. It is a large black valve attached to the inlet plenum and it has a large diameter rubber hose which connects to the air filter side of the TB. Wait for the idle to settle, with the engine running disconnect the electrical multi-plug from the IACV and see if the problem dissapears, if it does then the IACV may need a good clean. Oily Link to comment Share on other sites More sharing options...
prs Posted June 17, 2003 Share Posted June 17, 2003 I had a similar problem on my 1.6SS, revs slow to return especially when everything was hot. I took the throttle housing off and found it to be quite squeaky, I changed to the alloy type (thanks Count) and it's been perfect since. They are apparently prone to this as they say! Phil Link to comment Share on other sites More sharing options...
Axel Arnold Posted June 17, 2003 Author Share Posted June 17, 2003 oily, will take a look for the IACV, thanks for your explenation and help. prs, the alloy type 🤔 - is this the older one from the 1.4K or something special? Axel Link to comment Share on other sites More sharing options...
prs Posted June 18, 2003 Share Posted June 18, 2003 Axel, not sure when Rover brought the alloy type out (someone will be along in a minute to tell us) but the advantage is that you don't get the sticky throttle problem when hot and you can also tighten up the air filter clip as tight as you want without distorting anything which is a problem with the plastic housing. Have a look on www.eliseparts.com you can actually get a 160 throttle housing which has a throat size of 52mm instead of the standard 48mm. which they say will give a few more BHP. Phil AV02NJO Link to comment Share on other sites More sharing options...
Axel Arnold Posted June 18, 2003 Author Share Posted June 18, 2003 Looks nice, does the air filter fit / larger diameter? Axel Link to comment Share on other sites More sharing options...
mav Posted June 18, 2003 Share Posted June 18, 2003 the OD of the 52mm TB is thesame as the 48. I have a 48mm Ali one for sale. Drop me a mial via my profile to discuss. Pics, here, here and here Link to comment Share on other sites More sharing options...
chrisb Posted June 19, 2003 Share Posted June 19, 2003 When I had my hairdresser car (MGF vvc) I fitted a Green Airfilter. Following this I had the symptoms you describe. Put the car back to standard, and the problem remained. Took it back to the dealer, who said I'd probably overtightened the clamp. Fixed it under warranty (Even though we both admitted that it was entirely my fault . The even put the Green filter back on for me! Problem was then intermittant. It was traced to a something or other causing a slight isue with the ECU. Dealer explained that to reset the ecu, all I had to do was:- Ignition to position 2 Pump the brake pedal 5 times (Apparantly the ECU reacts when you apply the brakes, and takes its info from the brake light circuit) Switch off for 5 secs Hey presto re-set and away you go! Worked for me on quite a few occasions. Dunno if this might help, but it might be worth a go. Link to comment Share on other sites More sharing options...
Peter Carmichael Posted June 19, 2003 Share Posted June 19, 2003 Not the brake pedal. The throttle pedal. Link to comment Share on other sites More sharing options...
chrisb Posted June 19, 2003 Share Posted June 19, 2003 Couldn't remember which Knew it was one of them! Always time to be confused 😬 (And it was 6 years ago) Link to comment Share on other sites More sharing options...
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