Guest Eastoz Posted January 21, 2009 Share Posted January 21, 2009 I have a N/A Auto Supra. When i start it up it rev's to about 3000 even when it's hot-i have to tap the throttle to get it back down to just under 1000 which is how it should be. If i don't tap the throttle it rev's up and down on its own constantly. Over the last week occassionally when i drive i lose power, i can put my foot to the floor and it won't rev over 3000 at all. Can anyone advise or help?? Quote Link to comment Share on other sites More sharing options...
miko_supra Posted January 21, 2009 Share Posted January 21, 2009 This thread may help you a little http://www.mkivsupra.net/vbb/showthread.php?t=174406 Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 21, 2009 Share Posted January 21, 2009 Thanks but mine is not sticking at 3000 rev's, it won't go past 3000 !! it then revs up and down up and down until i blip the throttle then it goes down. it only happens now and then, but everytime i start it, the revs fly upto 3000 !! Quote Link to comment Share on other sites More sharing options...
supradriver Posted January 21, 2009 Share Posted January 21, 2009 (edited) if you find out you need some parts i have an N/A engine which im braking. i am happy too help you out. and N/A ECU if this is the problem Edited January 21, 2009 by supradriver (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 21, 2009 Share Posted January 21, 2009 if you find out you need some parts i have an N/A engine which im braking. i am happy too help you out. Thanks i will get my b/f to have a look this weekend and see if he can diagnose !! Quote Link to comment Share on other sites More sharing options...
supradriver Posted January 21, 2009 Share Posted January 21, 2009 it may be down too the engine management:( if it only goes up too 3k rpm and 3k rpm when starting. Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 21, 2009 Share Posted January 21, 2009 it may be down too the engine management:( if it only goes up too 3k rpm and 3k rpm when starting. It's really strange and only does it when it feels like it. The only way to explain it is when i had my TT 300zx and the MAF used to play up in the rain feels exactly like my Supra does when it plays up!! Quote Link to comment Share on other sites More sharing options...
supradriver Posted January 21, 2009 Share Posted January 21, 2009 does the engine Management light come on? Also check the throttle body it my be sticking Quote Link to comment Share on other sites More sharing options...
SteveR Posted January 21, 2009 Share Posted January 21, 2009 Do the NAs have a Throttle Position Sensor (TPS)? Quote Link to comment Share on other sites More sharing options...
supradriver Posted January 21, 2009 Share Posted January 21, 2009 not a clue:( need some one with more info Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 21, 2009 Share Posted January 21, 2009 does the engine Management light come on? Also check the throttle body it my be sticking No engine management light on at all? When i am idle the revs are high then if i don't blip the throttle it revs up and down. But... i can't explain why i have such a loss of power when i am driving?? When it happened sat night i though great!! When i jumped in it sunday morning it was fine again, then last night on my way home from work it happened again!!! Quote Link to comment Share on other sites More sharing options...
dude Posted January 21, 2009 Share Posted January 21, 2009 Check if you have an air leak. Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 21, 2009 Share Posted January 21, 2009 Check if you have an air leak. No air leak?! Quote Link to comment Share on other sites More sharing options...
supradriver Posted January 21, 2009 Share Posted January 21, 2009 hmmm this is strange. just need too hope some one can help you more. Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 21, 2009 Share Posted January 21, 2009 hmmm this is strange. just need too hope some one can help you more. My b/f is a jap performance car specialist but mostly with 300zx's, the garage he ran has had to shut due to the council etc so will ask him to stick it on the ramps this wkend and try to see what the prob's are then i'll more than likely be after some bits!!! Quote Link to comment Share on other sites More sharing options...
Rob Dublin Posted January 21, 2009 Share Posted January 21, 2009 Have you tried disconnecting the battery to reset the ecu? Could be the throttle position sensor or idle control valve? Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 21, 2009 Share Posted January 21, 2009 Have you tried disconnecting the battery to reset the ecu? Could be the throttle position sensor or idle control valve? Will try that this afternoon, thanks Quote Link to comment Share on other sites More sharing options...
Stonkin Posted January 21, 2009 Share Posted January 21, 2009 would a dodgy 02 sensor cause this? Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 21, 2009 Share Posted January 21, 2009 would a dodgy 02 sensor cause this? What signs would i look for if the 02 sensor was playing up? Quote Link to comment Share on other sites More sharing options...
supradriver Posted January 22, 2009 Share Posted January 22, 2009 My b/f is a jap performance car specialist but mostly with 300zx's, the garage he ran has had to shut due to the council etc so will ask him to stick it on the ramps this wkend and try to see what the prob's are then i'll more than likely be after some bits!!! just let me know if you need any thing. i dont rip members off i like too help:d Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 22, 2009 Share Posted January 22, 2009 Ok here's a new one! Driving to work this morning. Get about 30 miles up the m5 and i get the loss of power feeling again, the rev's drop and all of a sudden the exhaust sounds very loud! Seem's to be not going past 3000 rev's again and won't come out of second gear. I get off the motorway and it's no power all the way to my work (only a mile). I pull into my carpark and it just dies, not power steering nothing. Got it started enough to get it into a space!! Now what?? Quote Link to comment Share on other sites More sharing options...
supradriver Posted January 22, 2009 Share Posted January 22, 2009 it may be the same problem but getting worse:( not having much luck are you Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 22, 2009 Share Posted January 22, 2009 it may be the same problem but getting worse:( not having much luck are you Not today no!! time to get it in to a doctor i think!! hopefully something simple Quote Link to comment Share on other sites More sharing options...
Guest Eastoz Posted January 23, 2009 Share Posted January 23, 2009 She finally died lastnight!! Wouldn't rev past 4000 without missing and wouldn't change out of 2nd gear!! All good though after all that she's in the garage today and it seem's to be an ECU fault, should be back on the road by this evening!! Quote Link to comment Share on other sites More sharing options...
supradriver Posted January 23, 2009 Share Posted January 23, 2009 have you had too have a new ECU then? Quote Link to comment Share on other sites More sharing options...
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