worksevo89

iTrader: (8)

So as well as owning a evo I also own a 300zx, and lately it wont rev over 2500rpm. Some one told me it was the MAF, but they had no idea how to test it. If anyone has any info, it would be really appreicated.

Thanks

4g63smokinall4s

iTrader: (64)

try a 300zx forum

E VOL IX

iTrader: (8)

the maf will throw a code most of the time (Air/ fuel metering malfunction) or system lean air/fuel metering... you can put a scan tool on it and see what the barometric pressure is the se if the maf isnt reading right...but if it wotn rev over 2500 there should be a code stored

worksevo89

iTrader: (8)

Sorry I tried them, but the 300zx community isnt as helpful as you guys
It'll usually take a day or 2 and I never really get much help.

RussellM

iTrader: (256)

Have you tried cleaning the MAF w/ some MAF Cleaner? I would try that first before doing anything else if you think that might be it.

4g63smokinall4s

iTrader: (64)

that explains it!
Gl with it!

worksevo89

iTrader: (8)

I did try cleaning it, but had no luck.

The weird thing is, everytime I clear my ECU, the car works fine for about 10mins.

2k4EvoVIII

iTrader: (15)

That person is right it most likely is the MAF sensor.

NISSAN 300ZX Mass air flow sensor requires no regular maintenance. On mass air flow sensors with a sense wire, this wire can become contaminated with dust particles. These particles can be removed with automotive solvents that are safe for the use on mass air flow sensors. NISSAN 300ZX mass air flow sensors are commonly misdiagnosed. Before replacing the mass air flow sensor check for air leaks in the connecting air ducts and intake manifold. These leaks can cause similar symptoms as a malfunctioning mass air flow sensor.

Here is a link to where you can get a service manual to check the MAF with a ohm meter.
http://www.pdfoo.com/result-1992-nis...e-manual-.html

Good Luck!
Chris

RussellM

iTrader: (256)

What year is your car? Turbo or Non-Turbo? I will look one up for you and see what kind of sells history I have on them. I cant say I remember ever selling one for a 300ZX. That way we can tell if they are a 'problem' or not. Im thinking not, but you never know.

rlui0514

iTrader: (2)

+1

spdracerut

iTrader: (2)

It's either the MAF or something affecting the MAF. It sends a voltage reading to the ECU to determine the mass air flow. Using a multimeter, you can measure the voltage at the MAF and it should read roughly 1.4-1.7V at idle, or really close to that range. If any of the piping is loose after the MAF where air can leak in, it'll trip the MAF code and cause the car to run in limp mode; hence the 2500rpm limit. I'd guess either a loose connector or a loose pipe after the MAF.

worksevo89

iTrader: (8)

Just wanted to thank you guys for all the help. It was the MAF. And to my luck, I'm getting a free one tomorrow. Local guy just flipped his twin turbo Z and is giving me some of his parts before he scraps it.

spicythai2000

Test te MAF connector B (it is lable on the MAF-the small white wire) for voltage. It should 0.8vdc. Start the car and let it run to operating temp. With it idle check the voltage again. It should read 0.8-1.5vdc. Any reading lower or higher then replace the MAF.

4G63Rules

iTrader: (10)

Nice bump of a 4+ year old thread.