GaiJin

Sunday afternoon 19th feb. Nice wheels mate!!!

I had the same problem,gave it a good run and the tapping went.I tend to run the car only on sundays over the winter and then it may only be to turn the engine over for 10 mins if the weather is bad. Mine was getting ready for an oil change too, did that and as said she runs sweet. Give yours an oil change and Im sure you will solve your problem! :D GaiJin

Update* I cleaned up the terminals and connector on the engine temp switch today and since that the problem has gone! I will have a good run round in her tomorrow and confirm.It may be just coincidental and the problem may be back tomorrow but I will endevour to post any new findings in an effort to assist some other unfortunate soul digging this thread from the archives! Thx for all the help Ive received :bow: GaiJin

Thanks a lot Legrath I had a look on the online manual after wading through the pdf for half an hour without any luck I came here!! :headvswal Thanks mate GaiJin

Can anyone tell me what is the switch that sits alongside the engine temp switch. 91 TT Auto Many Thx GaiJin

Hello Stu, thanks mate...The IAC connector,is that the light blue plug or the yellow one below it? Thx for the assistance mate. As for subscribing, yer its been remiss of me and its the least I can do for the help Ive had from the forum. GaiJin

I empathise with your situation my friend...its driving me nuts too!!When I do get it sorted (fingers crossed) Ill be sure to post the remedy to help others such as yourself. Good luck in your quest GaiJin

Stuart, by IAC you mean Idle Air Connector on the IAAC valve right? The answer is no I didnt :headvswal and am unsure of the correct procedure if you can help mate.I can say however that before I had exactly the same problem before I changed the valve and had the vehicle through a complete diagnostic check the result of which was that the engine was running and set up perfectly. I do find your theory of the motion sensor interesting,Ill look into that! By 'when pulling away everything ok' statement I clumsily meant that once moving the revs rose and fell with acceleration/deceleration/gearchange seemingly perfectly. As mentioned before, when I have the car in neutral or park and rev it (warm) the engine halts for a split second before it revs-sometimes momentarily down to 300 rpm is the root of my problem or maybe Ive two problems with the car at the same time aarRRGGGgghh!! Many thanks for your assistance my friend. GaiJin

Thanks for the help guys,I havent had the aircon on or indeed tried it with aircon on but will do so. When I blew the old box the garage that replaced the box for me I suspect used the old torque converter :rolleyes: . On the dipstick, theres a mark for hot on one side and cold on the other and dipped it 4 or 5 times to be certain of the reading-as you say with clean fluid its hard to tell! Can you tell me the location of the sensors Willie? Thanks for your help I really appreciate it. GaiJin

Checked the oil level and found that it need .50 ltr to bring it up to the mark. Did an ECU diagnostic...code 55 everything ok, went on to do the left exhaust gas sensor and got the 5 flash ok signal. I then carried on into the right side diagnostic,revving at 2000rpm as before, and got the 2 flash indication that the ECU was now monitoring the right side ...but got no other code.Could an exhaust gas sensor be giving me these problems as previosly described? Oh btw....even though I topped up the auto box its not made any difference :( GaiJin

Thx WillieO, Ill go have a good look around the hoses although I havent initially spotted or heard anything.What you said about the oil overfill is certainly worth a look,I hope that this is indeed the problem...fingers crossed ;) GaiJin

Dunno if this is associated with the problem but when revving the engine,the rev counter needle dips for a fraction of a second before the engine revs.Could this be a vacuum problem u think?Could this also be part of the idling problem too? Many thanks GaiJin

Thx Lymon, actually I had the car in for a diagnostis check and a specialist centre locally a few weeks back to see if they could find the fault.The engine seemed to check out sweet but he did say that the autobox pressure readings were all over the place...problem solved I hear you say! I then visited my local Autobox guru and he said that nobody could accurately read autobox pressure readings and that my problem DID lie with the engine (probably the IAA valve) and threw the whole thing into doubt. Thank you for your response and advice mate! GaiJin

Worth a try, but what makes me doubtful-and Im no expert at all- is that Im just allowing the car to slowly move off by removing my foot off the brake and the problem goes,Im not even accelerating at all.The same is true when I run her and allow her to slowly draw to a halt in drive position.As soon as shes stood still I have the problem :headvswal Doh Thx for your speedy reply btw GaiJin

Hello fellow Z enthusiasts. I have a TT auto 91 import....heres my problem with her :confused: I recently blew the auto box and had this replaced with a second hand unit, since this (I mention the above although it could be coincidental) I get erratic tick over in drive and reverse only when stationary!!If I let the car roll then the revs settle down straight away, apply the brake and draw to a halt and the revs fluctuate sometimes to 300rpm and even to stall! I have changed the IAA valve and cleaned up all the contacts too.I have also cleaned up the TPS connectors too.Once under way the car acts perfectly and seems to be working fine,come to a T junction and Im having to put her into neutral to alleviate the wild idling. Is there any sensor on/in the auto box that may be broke you think? torque converter? Please help, any suggestions gladly recieved! GaiJin

44yr old,also pretty crappy postcode,parked on the street,clean licence... £209 fully comp on a classic policy from Houghtons whom Im glad to say quoted me VERY happy :xxx: GaiJin

Before buying a new iaa valve I retried cleaning the existing one,jetting it through with carb cleaner released quite a bit of gunk that I'd previously missed :rolleyes: .I had a look at the sensor behind the fan too,the bi-metal strip had quite a bit of verdigris on so I cleaned this too.Refitted and gave the car a good run round...PERFECT!!! Thought Id share this with you in case anyone has a similar problem and dig this thread from the archives. Many thanks to the people who helped Keep up the good work guys! GaiJin

I can recommend Houghtons for good cheap insurance,a guy called Ken does some good deals on 300ZX cars.I found this out by browsing through these very forums and am DAMN glad I did. I run a Starlet from day to day and the 300ZX on a classic insurance,both fully comp but with a 3000 mile pa limitation on the Z and get change out of 450 quid for insuring the pair with them!!! :) Very understanding people,give em a try GaiJin

Thanks for the advice guys,Ill give it a try before replacing the valve,I hope it works!;) GaiJin

Gave it a thorough clean out but still the same problem :( I notice that Im only getting the problem in Drive,in neutral-from cold its revving at about 1600rpm,drop it into drive,with brake applied and the rev counter drops to around 600-700 but then blips up and down as previously mentioned to around 1200 rpm.A good run round for a mile or two and the problem seems to go. One of those annoying problems that is gonna be a real pain to solve is my guess :rolleyes: Can anyone suggest anything!! many thanks GaiJin

Many thanks,Ill give it a go. Thank you for the help GaiJin

Thanks Hellraiser,firstly, please excuse my ignorance but what is iaav and from your description of its location I assume its near the nearside bulkhead behind the engine? Thank you for your response by the way :) GaiJin

Hello fellow Z enthusiasts. Ive got a very annoying problem with my 300ZX TT automatic,since I had a replacement auto box fitted (could be coincidental), from cold and until the engine has really warmed up-a couple of miles maybe, the engine revs fluctuate between probably 900rpm to 1500rpm when idling at a junction or traffic lights for instance.Once warmed up the problem dissapears.The car has an Apexi induction and the filter has been cleaned thoroughly.Could this be a problem with a sensor?any help from other members will be greatly appreciated. Many thanks for your time GaiJin

Thanks Dave for for replies,I'll give the hold button a stab and see how the fuel economy goes! thx too to all who helped in this thread ;) GaiJin

Thx David,I realise I sound a bit of a noob but this is my first Z and I got no manuals or data on it you see.It is indeed a Jap import and I notice the power/hold switch is 3 position,the central position of the rocker switch being off of course,how then does the opposite switch positions work? cheers m8 Gio....yeah mate the silver one did come in first! did you see the bit where he nukes the ladas on that dvd...priceless!!!:) GaiJin