hardenstine

i have a Nissan 300zx NA (z32) with a idle problem what is happening is when i start the car in the morning it does not want to idle. some times it idles real high for 3 sec and then drops and some time it just idles and then drops. the rpm needle jumps up and down below idle and then the car dies. i can hear a popping noise coming from the engine only during cold start ups only when i press the gas like a bake fire or after fire. it also does not want to move at first but after going for awhile it it moves fine. when i take my foot off the petal when im coming to a stop light. the rpm drops to idle like its not down shifting but it is a auto transmission when i get to the stop lights the rpm needle jumps up and down below idle then dies. if i turn off the AC and put the car in neutral the car idles fine and it dose not die. i have change the fuel filter and the fuel injector where change 3 years ago and i have cleaned the MAF the spark plugs look fine and air filter are clean. i have taken it up to the auto parts store and had the battery and alternator check and it is fine. i have no clue what it is

(if theres miss spelled words i am sorry im dyslexic so if you want to make fun go ahead i have listing to it all my life i have come to peace that there is just mean people in this world)

Icon27

sounds like the PVC valve is plugged, I had a old car that did this( dead give away is stopping at a red light and it stalling or runs real ruff.) we have 2, I just ordered a couple as well think there 5 bucks each.

hard to reach look up some tec tips and you may even have to replace some hoses.
this is a cheap starting point anyhow, could be vacuum leak ect ect. start with general maintenance like spark plugs/TSP/ clean all ele connectors and throttle bodys.

hardenstine

i replaces the PVC values already a couple of weeks ago it still ran the same i will start doing the other stuff and see where it go's the vacuum tubes do look a little creak and old

Lanoi

Try unplug maf sensor then start your car

hardenstine

ok heres the update i have replaced all the vacuum hoses and cleaned the throttle values changed the oil and i tried unplugging the MAF sensor like you said Lanoi it did not stall but made it idle high like a car with a bad MAF sensor. i notices a ticking noise coming from the fuel injectors is that normal?

hardenstine

change the spark plugs today this has the same effects no change please help if you know whats going on

hardenstine

heres a video of the problem

http://www.youtube.com/watch?v=AukqGUivZYo

hardenstine

yesterday i was going over to my friends house to do a break job and i noticed that there was a lot of heat coming from the center of my car i look under and the cytaliteic covers where bright orange so after we changed the cytaliteic covers and the care ran very well but it still stalls at terrific lights some time it doe it and some time it doesn't it like it happy and its sad my car has become human

threepointo

Here...

check it

http://www.youtube.com/watch?v=GhaW8...eature=related

hardenstine

ok so i order the right spark plugs and its showing signs of a bad fuel Pressures reg so i orded that to will see what happens

hardenstine

still given me problems i replaced the spark plugs it statred wrok ing good but when i came out again and started it up it started doing the same thing again then i replaced the aicv still nothing i cant set the idle ether it will idle to high or to low done ever thing but the FPR i should get that tomorrow i hop that works well im going to go hang myself right now ill let you know if it works sorry about the post earlier i jump the gun

hardenstine

well the FPR came today and installed it and my car works alot bator but my car still dies at idle wicht brings me to my next question does gas in the plenum kill the ICV

CanyonCarver

Try checking your manifold vacuum pressure. It should be between 18 - 21 in-hg. If it is low or fluctuates alot, we can diagnose from there.

Also check your fuel pressure with a pressure gage.

Have you checked for any ECU codes?

domsgarage

maybe do a compression check?

hardenstine

i did a computer check it coming 55 im thinking it my fuel pressure i have a form on fuel pressure to check it out

hardenstine

replaceed the fuel pump got ride of most of the problems

WOOZZH

I have had the same condition on my t/t. I had new 740cc injectors and ECU upgrade. The Nissan mechanic said this is the smoothest running Z he has ever seen after the upgrade. For what it is worth. I also heard the ticking and ran very rich on start up before. Good luck!

hardenstine

well the o2 was not reading so i had them replace still runs the same. im going to get the injector kit and replace the fuel injectors with the newer ones. hop that works.

domsgarage

why dont you bring it somewhere instead of just throwing money at it?

hardenstine

well i found the problem it had 2 bad injectors and one had a busted cap but i cant get any power to injectors now. i think your right im going to take it to some body its tax time so will have the money soon, but im still going to try.

hardenstine

ok im getting power to the fuel injectors now but the car still wont start

hardenstine

I fixed it!!!!! I fixed it!!!!!! Mass air flow sensor thats what was wrong with it the whole time!!!!!!!!! This is the happiest day of my life i love nissan 300zx.

domsgarage

good.

did they rape you at the shop?

hardenstine

no i did it all my self . it wont start because i had the fuel lines backward. but it ran the same so i replaced the iacv again ran a little better but still stalling. so i found this guy on craigslist that had a MAF for $50 so i was like i already spend over a $1000 already whats another $50 and it fix it i didnt think it was that because i got a new one a few years back so.