SupraTRD83 Posted April 21, 2009 Share Posted April 21, 2009 Hi all, well got a bit of a problem with the Supe. Basically when I start the car it will idle at around 450-500rpm and it sounds as if the car is going to cut out, there is also a rattle ive been having under the car for around 2 weeks now but thinking its the heat shield, will that be also a possible cause of the low revs that have suddenly appeared? it was always at 700rpm idle but now its down at 450 and as I set off in traffic it will sometimes judder as if its going to stall any ideas? tried search but cant find anything for an auto on this. O and it goes up when I put the AC on but dont want to keep putting that on everytime i hit traffic. EDIT: Also the positive on the battery seems to have a slight build up of battery acid (when it goes white) but cleaned that off and seems fine now but still the revs are low Quote Link to comment Share on other sites More sharing options...
SupraTRD83 Posted April 21, 2009 Author Share Posted April 21, 2009 anyone Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted April 21, 2009 Share Posted April 21, 2009 My car started doing that this week, very embarrasing when sitting at traffic lights and the car starts idling very low and about to cut out. I pulled the connector of the idle control valve with the intention of cleaning the valve assembly but I found oily cr@p in the terminals. I sprayed switch cleaner/isopropyl alcohol into it and airlined it out, problem has not come back...yet. Quote Link to comment Share on other sites More sharing options...
hadyn Posted April 21, 2009 Share Posted April 21, 2009 I think this is a minor Supra gremlin. Both Supras I've had have done this on totally random occasions. I wouldnt worry about it too much. Your rattle will be a heatshield. If the car is idling rough all the time, then I think you might have a more serious problem. Quote Link to comment Share on other sites More sharing options...
SupraTRD83 Posted April 23, 2009 Author Share Posted April 23, 2009 Thats the thing it doesnt always idle at that, the other day went out all day and it was always around 7rpm then today again its back to 500rpm argh!! Quote Link to comment Share on other sites More sharing options...
pistonbroke Posted April 23, 2009 Share Posted April 23, 2009 clean out the ISCV as stated in an earlier post. Check for fault codes, if nothing, then reset ECU. Quote Link to comment Share on other sites More sharing options...
SupraTRD83 Posted April 23, 2009 Author Share Posted April 23, 2009 UPDATE: I have rung my uncle who works on high performance cars and he is going to service it for me and hopefully that will cure it, ill also tell him to clean out the ISCV cheers again boys. Dont no if it helps aswell but just noticed today that when stopping in traffic i will roll it down to around 5mph and it will be at around 700rpm then i stop and the speedo suddenly drops from 3-5mph to 0mph instantly and then the revs drop to 500 does that sound about right for the ISCV? Quote Link to comment Share on other sites More sharing options...
pistonbroke Posted April 23, 2009 Share Posted April 23, 2009 Sounds like a speed sensor in the gearbox, a fault code will show up if you do the test to confirm. Quote Link to comment Share on other sites More sharing options...
SupraTRD83 Posted April 23, 2009 Author Share Posted April 23, 2009 Ill have to get the fault code and see whats on there, hope its not a bank breaker Quote Link to comment Share on other sites More sharing options...
devan Posted August 9, 2009 Share Posted August 9, 2009 I think my car is doing this too, it idles at about 400/500rpm, and the steering wheel shakes slightly and the engine note goes really low, although it doesnt sound like its going to stall, sounds pretty stable. What is the normal idling rmp on a n/a manual when the engine is warmed up? Cheers, Ash. Quote Link to comment Share on other sites More sharing options...
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