hey guys and gals. though i would chuck it up here for a little more help. ok so i'll explain it the best i can. sorry if its really long, hard to explain. so for the past couple weeks or so me and dad have been monitoring the oil levels in the zed. I had a scare where i thought it was using 3 litres per month, but false measurements were taking. anyways, we refilled the zed with oil being 10W40 or 10W50 i cant remember off the top of my mind. anyways after filing and letting settle, i went for a drive to a local shopping centre. give her a quick squirt and anything over 4k rev's was free revving. the engine would rev but the car would stutter and shake but wouldnt actually give any power. thinking something was up, i backed off, drove grandpa like and let the car sit for 2-3 yours while i met up with mates. jumped back in and drove home, although this time, no free revving. could do any rev and not a hint of trouble. so a week later still nothing, untill i do a mountain run, come home, shut the car off then the next day start it. the zed was blowing smoke like crazy out the exhaust. i first gathered head gasket, but the smoke smelt of fuel. shut it off. let it sit, started it again and still smoking. in true fashion i gace her a rev and it smoked and smoked then stopped. so i knew something was up, did this ^^ again on a recent drive, so granny'd it till it stopped and up untill yesterday it didnt do it. so took off, then all off a sudden, it felt like i lost a cylinder, its spluttered and surged and smoke was pouring out the exhaust. it wont hold idle, just stalls and the engine struggles at low RPM. and absolutely reaks of fuel. so me and dad are stumped. we know for a fact my TPS is set to .22 which i know is way wrong, but we dont think that is the problem. first thing we will fix tonight. but what are your thoughts? it sounded to us liek the zed was flooding, or a injector/coilpack/spark plug not firing causing us to lose a cylinder which it regains after a while then all goes back to normal. could this be my PTU or fuel regulators failing? also noted that when i rub my hand in the exhaust when smoking, its basically smoky black soot, obviously, but wet like fuel. is she just flooding? thanks heaps in advance guys. kindest regards. rod.
you need 2 find your fuel leak. sounds like maybe your injector orings are shot and your pouring fuel directly into the cylinder.... i seriously wouldnt drive it untill you find your leak... think .. hydrolock.. with fuel.... or even you could detonate so hard you could physically blow a hole in the block/piston
tps wouldn't cause that much to go wrong. to me it sounds like injected o rings aswell, cause you can get a huge vac leak tho the injector o rings. take the injectors out and get them cleaned and flow tested and replace the o rings and all the rubber components and see how see goes Andrew
you obviously know nothing about 300zx. the TPS on a manual will not cause THIS much trouble. :bash: i suggest you go back to NZR and stop posting the effing obvious. its been like this for 3 months, not a single difference to the car. again i just fixed this, took it for a spin, and what do you know, cylinder + smoke. so cross that off the list. thanks waztted. plenum off time! yeah the car is now stationary. wont be driven again untill the problem is fixed. thanks mate. 18 year old injector o rings sounds like the cause to me after the phone call. everything else has been replaced pro-plenum pull. most likely see you and james tonight, andrew! thanks mate.
not really but it's a problem and it needs to be fixed. And a piss easy problem, at that. It's like saying oh my car backfires...and my tyres are flat. Ok...we'll look into the backfiring in a minute but FIRST pump up your tyres [TIS]
Great observation champ, you ask for help i suggest you to re-adjust TPS, according to you it makes fuk all difference what the TPS is set to so in that case it must be a good idea to keep driving it set on .22v. TPS may not cause THIS much trouble but it can certainly contribute to it as i've seen incorrect TPS settings cause these problems. But seeing that you are the master mechanic im sure you will work it out, therefore there is no need for you to come on here and ask for help. Last time ill try help you out.... thanksbye :F:
Yes NOW you can cross that off the list, congrats how incredibly intelligent of you. Without first fixing small known issues how the hell can anyone really suggest anything? Not a single bit of difference? your TPS is now set correctly so there IS a difference. Are you actually suggesting that I for a moment was implying adjusting the TPS would some how cure your smoking issue?
a question though guys. how do i check if my injectors o-rings are gone, with the plenum in? i dont want to pull the plenum for a little guess work? obviously should be running conZult, check conncetions etc. then?
Check your plugs, if they are soaking wet in fuel then the o-rings are probably stuffed or you have a stuck open injector.
honestly, what would it do? cause it to run lean/rich. slightly one would presume? please share, what have you seen that the TPS causes? anything related to my post? fair enough. thanks for your 1 sentence attempt at trying to help me out. maybe next time, i can repay the favour i think... well never mind. you can help the way TTzed and andrew did. they didnt nit pick over the TPS, obviously its an easy fix, but one which would definitely not cause these symptoms. thanks anyways guys.
Just pointing out the obvious, i hope that you do fix it but there is no need to carry on saying that i obviously don't know a thing regarding 300zx's. You did a plenum pull.... with the help of 10 other people, congratulations you must know everything. My car isn't the one running like a dog
TPS will effect ignition timing and auto gearbox operation. May have an effect on TP (load, and hence AFR's) but I'm not sure exactly how that is calculated within the ECU. Unlikely to cause your problem.
this does work but since Rod has already pulled off his plenum and got rid of heaps of useless parts around it, the plenum should come out pretty easily and he should make sure the injectors are ok. If the plenum is off, ask your dad to prime the fuel pump and watch the lower plenum for leaks.
In that case just pull the plenum. On a NA it should be off in 10 min. Pull the rail, reconnect the fuel lines and prime it as Chris suggested, should be easy to spot
and put it in myself. thanks anyways mate.. my car isnt running like a dog, it's intermittent. weird.
