SupraLEDrears Posted March 17, 2014 Share Posted March 17, 2014 Both NA's, one 93 and the other a 95 facelift. When the cars gets up to temperature, it will idle very weird, almost like it's misfiring or spluttering. It does it mostly as you're in slow moving traffic and just etching forward, depressing and pressing the clutch or sometimes just as you are standing at traffic lights or gearing down to stop. On mine, I thought that the rocker cover gasket went and the oil went into the plug holes but my mechanic had a look and it was actually the oil seal near the distributor cap. He checked the cap and tho rotor arm,both 12 months old and he was happy with the way that they look and said that there was nothing on the spark plugs like oil. I did change the little vac pipe on the exhaust manifold that goes to the vac sensor, but nothing changed. My mate had his idle control valve changed but didn't do anything either. The only thing that I noticed, is that when I unplug the air flow sensor connectors, nothing happens. Should it not idle weird all the time if this happens? At normal driving speeds, everything is perfectly fine, no problems. Anyone had the same problem? Sorry for always just posting problems. Quote Link to comment Share on other sites More sharing options...
scott87 Posted March 17, 2014 Share Posted March 17, 2014 Any error codes? Mine turned out to be ht leads and water moisture. Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted March 17, 2014 Author Share Posted March 17, 2014 Any error codes? Mine turned out to be ht leads and water moisture. No error codes as I'm still trying to find the correct plug to go back to the snap on machine. Any way to test the leads? Quote Link to comment Share on other sites More sharing options...
scott87 Posted March 17, 2014 Share Posted March 17, 2014 You dont need a machine. Bridge e1 and te1 in the diag port in the engine bay. Turn the egnition on but dont start and then count the flashes. Quote Link to comment Share on other sites More sharing options...
Drgray Posted March 17, 2014 Share Posted March 17, 2014 I have this problem with my supra tt, no idea what causes it. The car runs good enough so will leave it for now until I get it taken for an inspection Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted March 17, 2014 Author Share Posted March 17, 2014 You dont need a machine. Bridge e1 and te1 in the diag port in the engine bay. Turn the egnition on but dont start and then count the flashes. Thanks Scott. I'll do that tomorrow and reply back. Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted March 18, 2014 Author Share Posted March 18, 2014 Error code 4 blinks pause 1 blink pause 4 blinks pause 1 blink pause repeat Quote Link to comment Share on other sites More sharing options...
Stonkin Posted March 18, 2014 Share Posted March 18, 2014 Error code 41 is Throttle Position sensor (TP Sensor) short / open circuit Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted March 18, 2014 Author Share Posted March 18, 2014 Error code 41 is Throttle Position sensor (TP Sensor) short / open circuit Thanks for the reply Does it need replacing or how does it work? Haha Quote Link to comment Share on other sites More sharing options...
scott87 Posted March 18, 2014 Share Posted March 18, 2014 Thanks for the reply Does it need replacing or how does it work? Haha tps can be a pain. Im pretty sure there is a nice guide on here on how to set it correctly and test the unit. Ill see if i can find it. Quote Link to comment Share on other sites More sharing options...
Stonkin Posted March 18, 2014 Share Posted March 18, 2014 I cant be of much help i'm afraid, but this may be http://mkivsupra.net/vbb/showthread.php?283866-How-to-reset-the-Throttle-Position-Sensor&highlight=throttle+position+sensor Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted March 18, 2014 Author Share Posted March 18, 2014 I cant be of much help i'm afraid, but this may be http://mkivsupra.net/vbb/showthread.php?283866-How-to-reset-the-Throttle-Position-Sensor&highlight=throttle+position+sensor Thank you! Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted July 18, 2014 Author Share Posted July 18, 2014 Sorted itself out in the end and Kirk checked everything over for us. Top guy. Quote Link to comment Share on other sites More sharing options...
Ian C Posted July 19, 2014 Share Posted July 19, 2014 It might be the ECU not seeing the IDL switch activating in the TPS, which tells it that the throttle is closed and to go to an idling strategy with the idle control valve. Quote Link to comment Share on other sites More sharing options...
Guest Roger NE Posted July 20, 2014 Share Posted July 20, 2014 (edited) If it "sorted itself out" it is likely to play up again . . . Think of the TPS like a conventional Volume Control in a radio or hi-fi . . . it's basically a variable resistor with a wiper that goes round a track You know how volume controls go crackly? That's because of dirt buildup inside. Just wiggling the knob back and forth can often clean them OK . . . but to do a proper job you use electronic Switch Cleaner/Lubricant. (this removes the deposits that build up, and also re-lubricates the track to stop it wearing out and reduce oxidation) The TPS is exactly the same . . . but of course it's in a much more hostile environment than a radio - lots of dirt, heat etc ! Just cleaning it properly will often fix it . . . but it may need adjusting (as per the TSRM) so that it is giving the correct resistance readings at the right point of the throttle opening. By the way, I also agree with Scott that your poor Idle symptoms are also what happens if you need new HT Leads. They are the most neglected item on ANY engine - I always recommend fitting a new set every 6-7 years. (the insulation develops microscopic cracks that you can't see, and there is no real way of testing them without very specialised equipment. And faulty leads won't ever show any Error Codes) Edited July 20, 2014 by Roger NE (see edit history) Quote Link to comment Share on other sites More sharing options...
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