MAF voltage reading high at idle

[Nathan]

I've heard of marginal differences in MAF voltage at idle, but my Z32 is reading over 3 volts, probably about 3.6 or so. I'm certain that this is causing me to run rich as there is a decent amount of black smoke at idle now. Has anyone ever seen one read this high? I'm thinking my junkyarded MAF is sadly, dead. Its also kicking the car into limp mode I think as I can NOT rev over 3k. Strangely enough though, I can rev over 3k in neutral, just not in any gear. I'm a bit confused about it right now

[huguetpj]

Haven't measure anything as of yet... but 3.6V does seem high to me. Are you sure your connections are ok?

[Nathan]

Well, I know the connections themselves are good, but I dont know if they are right (if that makes any sense). Its possible I got confused when wiring it because its a z32 maf, a maxima maf plug, to 240 wiring, so it was a bit odd. I thought it was right but it might well be wrong, I'll have to check it out and see

[Nathan]

Wow, now I'm extremely confused, I checked the wiring and verified that the grounds were indeed good, but on a whim I switched the power and signal wires. Now, it starts up just fine, runs better than ever, but slowly coughs to a horrible, sad, death in about 10 seconds Also, the TPS is just fine, I randomly checked it, the injectors are all getting 12v etc. so I'm still thinking its a maf problem. Finally, I reset the ecu in between the maf changes too, so it shouldn't be anything weird with that.

Edit: now I read .3v on the maf signal wire with the key in the on position. I cant check it at idle because I'm not that quick, it dies before I can get there

[Nathan]

Ok, it turns out that hugue was right, the MAF was wired wrong, thats right now but my idle still sucks. Could be those 72# injectors not liking me. Also, my smoking problem seems to have gone away and if I could just get it to idle right, we'd be in business. I'm letting it cool down right now before I take it for one last drive and then replace this leaky as hell water pump, its REALLY leaking badly so I'm going to need to get on that I'll report back on how it drives now but I know that it revs MUCH more freely than it used to.

[fiznat]

Now, it starts up just fine, runs better than ever, but slowly coughs to a horrible, sad, death in about 10 seconds

LOL I cant wait till Nathan comes back with his tail tucked between his legs, and lets us ALL know what the problem was here.....

oh boy oh boy :icesangel

[Nathan]

Oh yeah, I forgot to mention...the car kept dying because one of the intercooler pipes was unatached...it turns out I forgot to tighten the clamp on it in my haste last weekend

[fiznat]

lol, we thought he was out of gas before.. that woulda been funnier.

anyways, back to the discussion at hand!

[Structure240sx]

cant wait to see what your car can do

[huguetpj]

:ylsuper

[WDRacing]

lol, we thought he was out of gas before.. that woulda been funnier.

anyways, back to the discussion at hand!

LMFAO

[Nathan]

LMFAO

Seriously, I was convinced I was out of gas (it WAS really low, but seems that it wasn't actually out). I've had it running a good bit in neutral and I just assumed that somehow I'd run it out of the 5 gal. I'd put in a couple weeks ago. However, I DID have something strange making me think that...up until just the other day when I'd put the key in the on position, the walbro would kick in and I could watch my fuel pressure gauge climb on the aeromotive fpr. If I didn't start the car, it would VERY slowly drop back down to 0 over the course of at least an hour. However, now, it instantly drops back down and everytime I start the car, I get to listen to the sound of the fuel rail getting filled back up (gurgle gurgle gurgle). Does anyone else with an aftermarket fpr notice this? It was very strange to me that it didn't do it, then all of a sudden started too. The only thing I can figure out is that it is "broken in" now, it still holds pressure just fine when the car is running so I'm not too worried.

[Projex240]

This may be stupid--but could it in anyway be the fuel pump crapping out on you. Ive never heard of it happening where it will start up with the acc on, and then die out while running, but hey---theres always a first time for everything. Maybe the connectiosn are bad--or the fpr is bad---dont know man. I know that usually, when you put a fuel pump in, you know how it doe swhen you pull the fuel pump fue to crank the car and let it die out? That it takes about 10 seconds to die sounds pretty familiar to me. I dont know whatelse it could be unless your FPR is going out or was bad when you bought it. It may have been well on its way to crapping out when you got it, and just finally bought it, and now its not working properly. Have you tried to go back to your factory FPR to see if it works? Or are you 4 bar?

Just some helpfulness..hope it gets working again.

-Josh

[Nathan]

Hehehehe, its been working again for a good week now I'll be reporting back sometime next week after I break it in a bit more and then start having some fun!