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View Full Version : Car's sputtering and cuts off at wot. Maf prob?


turbo_dreams
04-30-2009, 07:07 AM
Drove my car to friends shop so i could redo some things here and there before the season. Stripped interior out to redo it, put my one drivers seat in to just take it down the block...cranked the car and it started after cranking for a bit, idle'd fine, then as soon as i got on the gas it'd either die out or if i gave it full throttle it'd sound like it's hitting the limiter at like 2-3k and then dies. I put in new spark plugs/wires. However i'm begining to think my maf may be the culprit, thanks to not running an air filter most of the time i was ka-t. My setup is as follows,

Stock block kade.
T25
370cc injectors
walboro 255
3 inch d/p-exhust all the way through to apex'i n1
fmic
Nology hotwires (plug wires)/Ngk bkr7e plugs
bee-r b.o.v
All tuned off an safc 2 at stock boost, which is at 5lbs after my boost leaks from the back of my block.
I didn't feel the need to upgrade my maf at the time i turbo'd my ka, being it wasn't an insane amount of power, but if anyone has a 300z maf f/s, p.m me.
What i'm confused about is that i drove the car about 30-40 mins from my house to the shop w/ no problems, it stayed there for the past month or so, and now it's doing this, can a maf just give out like that? Need the car starting next week being it's once again my only car now (yes im done w/ an attempt at a "daily driver", for now). I'll be trying to get ahold of a maf to borrow this week and see if that solves my problem, but i thought i'd ask for everyones input since im behind a computer 8 hours a day at work. Thanks

aziankingz
04-30-2009, 08:27 AM
check the intercooler couplings.. might just be boost leak..

turbo_dreams
05-01-2009, 05:54 AM
check the intercooler couplings.. might just be boost leak..

Checked all couplings, im sure it isn't that, i'll be testing a new maf tonight, so i'll see.

turbo_dreams
05-02-2009, 01:13 AM
Swapped in a new maf today, still same issues, it may be a safc issue, anyone using safc know what may cause it to send the car to limp mode or not rev at all?

waynehead05
05-02-2009, 02:50 AM
Take a good look at the t25 to manifold gasket. Is it blown out? That'll cause that.

turbo_dreams
05-06-2009, 05:40 AM
Figured out it was the grounds in the interior that was causing that. My new problem is the car wont boost at all, i know the turbo's not blown, but when i floor it i only hear it spool, but no b.o.v or psi. I'll try and tune it asap to see if it helps.

southerncross
05-08-2009, 05:34 AM
thats weird, my 90 Sohc car is doing the same thing. ive been on 5 different forums trying to figure this out. checking grounds is a new one, so i'll try that. i think ive changed about a hundred things out on my car trying to get it to run right.