accent x3 turbo problem - Hyundai Forum: Hyundai Performance Forum

» Auto Insurance
» Featured Product
Wheel & Tire Center

Go Back   Hyundai Forum: Hyundai Performance Forum > Technical Forums > Forced Induction and Nitrous Discussion
Register Home Forum Active Topics Gallery Garage Search Today's Posts Mark Forums Read Auto Escrow

HyundaiPerformance.com is the premier Hyundai Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 12-16-2012, 04:44 PM   #1 (permalink)
Member
 
Join Date: May 2012
Posts: 41
Gallery: 0
Default accent x3 turbo problem

hi all

im having a problem with my turboed accent.

i know what those engine can handle don't worry about it lol

my car & setup
accent 1999
1.5L sohc stock
302 500 km ( yes , original but anyway... )
CXRacing t28 10 psi
CXRacing bov
CXRacing intercooler
GlowShift wideband
GlowShift boost gauge
GlowShift oil pressure
custom made vaccum manifold
OBX fmu 8:1
tiburon 2.0L injector
NGK sparkplug ( dont remember model but 1 step colder , gapped to .30 )
all the rest is stock

i checked about 20 time , no boost/vac leak at all.

the problem is when the boost come around 4-5 psi ( it always depend ) the AFR go really lean ( show 20:1 ). the engine rpm stop going up.
if i hold it , SOMETIME the afr show 20 then 16 then back to 20 ( a 5 second WOT run )

for info , my fuel pressure hit 70+ so the fmu is doing its job ( without fmu = 45 )
also my stock fuel pump is in really good shap and hold up the pressure.

i tried unplugging the following but nothing change
#1 sensor
#2 sensor
fpr
fmu
maf

even 4 tuning shop have no idea what is wrong.

i dont think its fuel cut because fuel cut is agressive and its not the case.

im lost... anyone have an idea ??? thanks

EDIT :
seem to be MAF related ( bein maxed out so the ecu cut fuel ).
what you think ?
if you think tis the problem , how i fix it ?
i know i could get a bigger maf but i stay with hyundai parts and used hyundai part are hard to find here.
maf clamp sound to be a better solution if its the problem... is it hard to make ?

Last edited by NvidiaForTheWin; 12-16-2012 at 06:31 PM.
NvidiaForTheWin is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-18-2012, 08:15 PM   #2 (permalink)
Administrator
 
krazymikeyGT's Avatar
 
Join Date: Jan 2007
Location: Lake in da Hills, IL
Posts: 1,447
Gallery: 0
Send a message via AIM to krazymikeyGT Send a message via Yahoo to krazymikeyGT
Default

try emailing some of the turbo users.

there are a few who can help you
__________________
I like to go fast
krazymikeyGT is offline   Reply With Quote
Old 12-19-2012, 09:06 AM   #3 (permalink)
Member
 
Join Date: May 2012
Posts: 41
Gallery: 0
Default

Quote:
Originally Posted by krazymikeyGT View Post
try emailing some of the turbo users.

there are a few who can help you
thanks for your reply.
unfortunately finding member with FMU setup would take long time IF there is at least one.

i could go with AEM F/IC but in 2-3 months so i need to find a fix so i dont blow it this winter....

PS even running 5 psi i have the same problem so lowering from 10 to 5 psi will not fix the problem.
NvidiaForTheWin is offline   Reply With Quote
Old 12-22-2012, 03:23 PM   #4 (permalink)
Member
 
Join Date: Aug 2010
Posts: 87
Gallery: 0
Default

You could be getting spark blowout which would make your wideband read lean, I ended up gapping the plugs down to around .020 running 9 psi with a t25. Also disconnect the first o2 sensor and then reset the computer and run it like that or the AFR will be inconsistent under boost and do weird things. Your going to want the tiburon/elantra maf sensor so you don't run rich off boost. I'm surprised the stock fuel pump is holding up, my 12:1 fmu made almost no difference without a walbro inline. Check out my thread 99 accent turbo
steelcoffinx3 is offline   Reply With Quote
Old 12-23-2012, 11:22 AM   #5 (permalink)
Member
 
Join Date: May 2012
Posts: 41
Gallery: 0
Default

thanks i will try that.

for the 2.0l maf... mine run rich only when cold and the engine run bad.
when it warmed up a bit then the afr is around 14.5-15 wich is the same as my brother 03 accent GS when it was stock.
NvidiaForTheWin is offline   Reply With Quote
Old 01-05-2013, 01:06 AM   #6 (permalink)
Junior Member
 
Join Date: Apr 2007
Posts: 17
Gallery: 0
Default

I agree with your thinking the maf is maxing out and cannot read any higher, but spark blow out might also be a problem.

I don't think the 2.0 will be enough but may be wrong. I would try something larger, maybe a GM out of 93-97 V8 Car, like the impala,firebird or camaro.
synntax_error is offline   Reply With Quote
Old 01-05-2013, 02:10 AM   #7 (permalink)
Member
 
Join Date: May 2012
Posts: 41
Gallery: 0
Default

thank you.
i dont think its spark blowout because i gapped my plugs to .25 and no change.
before i start trying the boost my spark was super clean ( 100-200 km ).
since i started to try the boost ( under 5 km done ) my spark are all black.

anyway... i can find the maf you suggest but for 120$ the cheapest i found.
but i go with aem FIC next month ( i decided to even if i get rid of the car end of spring anyway ill put it in the elantra and i can tune it meself )
.
120$ for a month......... lol ?... NO.
this is why i need a temp CHEAP fix . i know the engine can blow running poor.
NvidiaForTheWin is offline   Reply With Quote
Old 01-17-2013, 06:21 PM   #8 (permalink)
Member
 
regit's Avatar
 
Join Date: Feb 2004
Location: Halifax N.S
Posts: 73
Gallery: 0
Default

Sounds like a fuel issue,leaning out under wot, .with over 300000kms, I'd do a compression test first.
regit is offline   Reply With Quote
Old 01-17-2013, 07:27 PM   #9 (permalink)
Member
 
Join Date: May 2012
Posts: 41
Gallery: 0
Default

i tought i answered.... but i forgot.

the problem is fixed.
i did a maf clamp ( 4.3v zener diode ) for 2$.
i can now hit 10 psi , afr is 11:1 - 11.5:1 ( hit 13:1 half a second only when engine is not at operating temp ) , and no problem at all.

still , thanks you all for the help
NvidiaForTheWin is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Hyundai Forum: Hyundai Performance Forum > Technical Forums > Forced Induction and Nitrous Discussion


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 03:00 PM.



Powered by vBulletin®. Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.3.2
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.