supRo Posted September 15, 2006 Share Posted September 15, 2006 2JZ N/A engine (Lexus GS300 Auto UK spec) I'm getting high idle - just over 2000 rpm on cold start and about 1000-1100 when hot/ I will renew the air filter. Should I also remove and clean the intake manifold??? I will clean the MAF and air temp sensor - is brake cleaner (spray) ok? Also can exhaust leak cause high idle? Thanks, Ro Link to comment Share on other sites More sharing options...
terribleturner Posted September 15, 2006 Share Posted September 15, 2006 N/A's rev slightly higher than TT's anyway, but 2K is a tad much. Have you adjust the idle screw yet?? Link to comment Share on other sites More sharing options...
Pete Posted September 15, 2006 Share Posted September 15, 2006 Have you adjust the idle screw yet?? I thought that was a no no and screws up the TPS sensor or something? Link to comment Share on other sites More sharing options...
terribleturner Posted September 15, 2006 Share Posted September 15, 2006 Intresting, but if it does why would it be there to adjust?? You could be right just playing devils advocate. Link to comment Share on other sites More sharing options...
Pete Posted September 15, 2006 Share Posted September 15, 2006 http://www.mkivsupra.net/vbb/showthread.php?t=43611&highlight=idle+screw Also kind of related - http://www.mkivsupra.net/vbb/showthread.php?t=13979&highlight=idle+screw Link to comment Share on other sites More sharing options...
terribleturner Posted September 15, 2006 Share Posted September 15, 2006 DOH!!!! /vbb/images/smilies/bbcode_oops.gif The worst thing is i don't even remember it Link to comment Share on other sites More sharing options...
Daston Posted September 15, 2006 Share Posted September 15, 2006 2k cold is normal and 1k hot is normal under load (ie lights aircon etc on) mike normaly sits at 800-900 Link to comment Share on other sites More sharing options...
supRo Posted September 15, 2006 Author Share Posted September 15, 2006 Thanks guys I will clean the Maf sensor just in case - Is brake cleaner spray ok? Link to comment Share on other sites More sharing options...
Prof. Monkey Posted September 15, 2006 Share Posted September 15, 2006 No! The idle is within the limits, dont forget at the start the idle is rich, when hot it should be 1200rpm - same as an NA Supra. Link to comment Share on other sites More sharing options...
supRo Posted September 15, 2006 Author Share Posted September 15, 2006 No! The idle is within the limits, dont forget at the start the idle is rich, when hot it should be 1200rpm - same as an NA Supra. Oh! OK! Cheers Darren. Have you received the log book back? Ta, Ro Link to comment Share on other sites More sharing options...
Prof. Monkey Posted September 15, 2006 Share Posted September 15, 2006 Got it today so posting out tommorow! Link to comment Share on other sites More sharing options...
supRo Posted September 15, 2006 Author Share Posted September 15, 2006 It actually drinks more fuel than my BPU TT by the way! Hence thinking the Idle speed may be contributing to this. I'll get the spark plugs changed. Got it today so posting out tommorow! Cheers Link to comment Share on other sites More sharing options...
Keith C Posted September 15, 2006 Share Posted September 15, 2006 No! The idle is within the limits, dont forget at the start the idle is rich, when hot it should be 1200rpm - same as an NA Supra. Faye's NA idles at about 600 or so when hot! Certainly not 1200! Link to comment Share on other sites More sharing options...
carl0s Posted September 15, 2006 Share Posted September 15, 2006 600 - 650 is right for my TT also. With A/C on it's close to 1,000. Cold start is 2,000rpm, as we already know, due to the fast idle procedure. Are you sure A/C isn't switched on? Link to comment Share on other sites More sharing options...
supRo Posted September 15, 2006 Author Share Posted September 15, 2006 600 - 650 is right for my TT also. With A/C on it's close to 1,000. Cold start is 2,000rpm, as we already know, due to the fast idle procedure. Are you sure A/C isn't switched on? Nope - the AC is off. Fuel consumption is high too (Higher than my BPU Supra, even when giving it a thrash!) Link to comment Share on other sites More sharing options...
supRo Posted September 15, 2006 Author Share Posted September 15, 2006 Faye's NA idles at about 600 or so when hot! Certainly not 1200! I don't know the NA engine at all - but I would have thought what I'm getting is a little high. Obviously the relatively high Idle (compared to my TT anyway) is quite load and a cruiser like the GS300 doesn't seem to be right being that loud Link to comment Share on other sites More sharing options...
supRo Posted September 16, 2006 Author Share Posted September 16, 2006 Firstly a big thanks to Absxxxx, who was kind enough to check and diagnose the car. The car is indeed running high Idle - the throttle cable has been tightened. This is masking the underlying issues. I knew there's bit of a misfire and slight exhaust leak but it's worst than I thought. The fuel consumption is higher than my BPU TT because it's running on 5 Cylinders!!! Abs colleague stepped in and this guy is a genius - By standing next to the car he said "the misfiring is not because of a ignition or exhaust leak issue - it's a vacuum problem"!! And indeed he was right! They then sprayed a special fluid over the vacuum pipes (This is a Maf sensor based N/A engine) and found out that it's coming from the throttle body to intake manfold gasket. Hopefully it's just the gasket and not a crack somewhere. So it's time to get my hands dirty and start fixing her up. Cheers Abs and everyone who posted, Ro Link to comment Share on other sites More sharing options...
CarlT67 Posted February 15, 2008 Share Posted February 15, 2008 Reviving this thread as it sounds similar to my problems, to clarify the reason your engine was rich was cause it was running on 5 cylinders and the high idle was due to an air leak...? Thanks Carl Link to comment Share on other sites More sharing options...
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