Martinjj Posted June 9, 2014 Share Posted June 9, 2014 Hi Guru's. Just a quicky for you, i have recently purchased a 350z 313 GT, test driving i didnt come across any issues, anyway now i have a little problem as i am about to explain. Firstly a point to note is that i have no Engine Warning Light (CEL) so i cant flash a code out of it. When engine is up to temperature the idle will not drop, infact it is quite erratic rising and falling between 1500 rpm and 1750-1800 rpm at a stationary position, clutch fully down. My first instinct was that the Throttle Bodies may need a clean, recent receipts that came with the car show a replacement TB in early 2013, so at this point i have not gone in and taken them off, all i have done is Idle Air Volume Relearn via a pedal dance (i have lots of practice in this with having previous Nissans, so im confident all was done correctly), Anyway the relearn did not solve the issue, I have also done the Throttle Position Relearn. My question is before i resort to taking off the Throttle Bodies would i be better off going down the route of MAF cleaning first to eliminate a dirty MAF as an issue? or just go the whole hog, whip the lot off and get to work on both MAF and the TB's? Or an even easier solution would probably be if any member on here has had a problem very similar can they point me in the right direction as to what the issue could be. Cheers Martin Quote Link to comment Share on other sites More sharing options...
WhackyWill Posted June 9, 2014 Share Posted June 9, 2014 Welcome to The Land of Zed. . MAF may need a clean. Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 9, 2014 Author Share Posted June 9, 2014 Thanks for the super speedy reply Will, il get to work on that soon as i have finished my coffee, is it a good practice after to do some kind of a relearn again after or will the ECU do all the work? 1 Quote Link to comment Share on other sites More sharing options...
WhackyWill Posted June 9, 2014 Share Posted June 9, 2014 I cleaned mine with Maf Cleaner from Halfrauds I tried not to move any of the setting and I marked the position before I removed it but that was on a DE. . Good Luck. 1 Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 9, 2014 Author Share Posted June 9, 2014 Yeah i got half a can of that left over from a previous MAF blasting session an my old Primera, anyway the good old English weather gods have thrown a spanner into the works and now its peeing it down, so that will be my tomorrow job, will keep you posted and once again many thanks.. 1 Quote Link to comment Share on other sites More sharing options...
WhackyWill Posted June 9, 2014 Share Posted June 9, 2014 Yeah i got half a can of that left over from a previous MAF blasting session an my old Primera, anyway the good old English weather gods have thrown a spanner into the works and now its peeing it down, so that will be my tomorrow job, will keep you posted and once again many thanks.. It could be a number of things but most likely the MAF, I would start there. I also used used rubbing alcohol and cotton wool on a MAF on my old Mec but that was very dirty. 1 Quote Link to comment Share on other sites More sharing options...
KyleR Posted June 9, 2014 Share Posted June 9, 2014 (edited) I'd be more concerned as to why the car is idling at over 1500 RPM! PS. I think Will means the TB, because there is nothing to move on the MAF Edited June 9, 2014 by KyleR 1 Quote Link to comment Share on other sites More sharing options...
WhackyWill Posted June 9, 2014 Share Posted June 9, 2014 I'd be more concerned as to why the car is idling at over 1500 RPM! PS. I think Will means the TB, because there is nothing to move on the MAF Thanks Kyle yes' that's exactly the bit, the butterfly in the throttle body. 1 Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 9, 2014 Author Share Posted June 9, 2014 Little break in the weather so i could get started, ive got both MAF's out and sprayed (just waiting for drying out), right hand MAF (passenger side as i look at it) shows a missing screw as in the pic attached, could this be a culprit in causing an ingress of air that does not pass over the sensor? Quote Link to comment Share on other sites More sharing options...
Commander Posted June 9, 2014 Share Posted June 9, 2014 no idea, but turn the car on, put your finger over the hole and see what happens? Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 9, 2014 Author Share Posted June 9, 2014 no idea, but turn the car on, put your finger over the hole and see what happens? Its a blind hole just for the screw to fasten too, MAF's are back in and just been for a spin and idle still hunting the same @1500-1750'sh when warm, will have a go at the TB's tomorrow Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted June 9, 2014 Share Posted June 9, 2014 Preowned Throttle Bodies and MAF sensors are all in stock if required for 350z 313 GT HR. Just drop me a PM if I can help further. Alex. 1 Quote Link to comment Share on other sites More sharing options...
KyleR Posted June 9, 2014 Share Posted June 9, 2014 I think you need to bring it somewhere, it really should be idling at half that. Quote Link to comment Share on other sites More sharing options...
KyleR Posted June 9, 2014 Share Posted June 9, 2014 Also can't see a dirty TB causing it, however if one or both are stuck slightly open, then that'll cause it. Quote Link to comment Share on other sites More sharing options...
GIXXERUK Posted June 9, 2014 Share Posted June 9, 2014 sounds like an air leak somehere (inlet, split pipe etc) and it is fuelling to compensate, hence the high revs..more air. more fuel Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 9, 2014 Author Share Posted June 9, 2014 (edited) Preowned Throttle Bodies and MAF sensors are all in stock if required for 350z 313 GT HR. Just drop me a PM if I can help further. Alex. I am putting a little list together for some bits from you as i go along (mainly interior bits and bobs), i will see what the outcome is from taking the car back to the dealer to have it put right first then contact you. sounds like an air leak somehere (inlet, split pipe etc) and it is fuelling to compensate, hence the high revs..more air. more fuel Good point, MAF's are now cleaned up, managed to get the TB's off and clean those out, drivers side was pretty clean, passenger side a little messy but cleaned up now, all back together and relearning done absolutely no change at all, so back to the dealers it goes while still under his warranty. Edited June 9, 2014 by Martinjj Quote Link to comment Share on other sites More sharing options...
Hooch Posted June 9, 2014 Share Posted June 9, 2014 (edited) Don't shout at me for saying this but can't you try the throttle reset (peddle dance) and see if its brings it back to normal? http://www.technosquareinc.com/350reset.htm Edited June 9, 2014 by Hooch Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 9, 2014 Author Share Posted June 9, 2014 Hi Hooch, done that probably a dozen times now, I'm quite good at it after having a lot of practice before so I know that me getting it wrong is not an issue, the only thing that I have not done is the ECU reset only because there is no Engine Management light on so I can't see the point.. Quote Link to comment Share on other sites More sharing options...
Paddy78 Posted June 9, 2014 Share Posted June 9, 2014 ECU reset is worth a go before replacing anything? 3 Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 10, 2014 Author Share Posted June 10, 2014 The car goes back to the dealer on Friday, today I went around the hoses and TB's with carb cleaner no change in idle but I swear ( or maybe my ears deceive me) I can hear a slight hissing noise coming from either behind or under the plenum, hard to tell with a v6 rumbling away at the same time Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 10, 2014 Author Share Posted June 10, 2014 The car goes back to the dealer on Friday, today I went around the hoses and TB's with carb cleaner no change in idle but I swear ( or maybe my ears deceive me) I can hear a slight hissing noise coming from either behind or under the plenum, hard to tell with a v6 rumbling away at the same time Quote Link to comment Share on other sites More sharing options...
Paddy78 Posted June 10, 2014 Share Posted June 10, 2014 Have you done anything silly like trap anything in the plenum? My idle was erratic when I trapped the rubber oil filler collar in mine! Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 10, 2014 Author Share Posted June 10, 2014 No Paddy, not done a thing at all apart from take out the MAF sensors for a clean and the Throttle bodies for the same treatment.. Only had the car for 4 days the problem did not show on the test drive just on the way home from the dealers, cold start up revs are fine once engine is hot then the problem shows, some American guy had the same problem (bit worse than mine though) he made a YouTube vid to show the issue, he says he sorted it with a new ECU, Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 10, 2014 Author Share Posted June 10, 2014 The American guys video, bit long winded as you don't see the issue till near the end. http://m.youtube.com/watch?v=0Y-Pmf5wRJo Quote Link to comment Share on other sites More sharing options...
Martinjj Posted June 10, 2014 Author Share Posted June 10, 2014 (edited) Sorry, double posted.. Edited June 10, 2014 by Martinjj Quote Link to comment Share on other sites More sharing options...
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