QUiKSR20

Hey guys,

Well since I went turbo Ive had a ton of little Gotchas, I wouldn't say major problems at all just little issues 1 by 1 im overcoming..

Basic Info before I go off on tangent.

• Avenir DET ( 9lbs stock boost )
• N62 MAF in Billet MAF box ( blow thru ) 12" from TB
• Greddy Type S ( venting to atmosphere ) 6" from MAF
• CALUM Basic
• 370s @ 3 bar
• Stock Fuel Pump ( walbro 255 is enroute )

OK so I get the car up and running and theres a high idle, 1500-1800 RPM and once it warms up it was fluctuating ( 1000 / 1800 or so )
back and fourth but never once wanted to die.. Led me to think IACV vacuum was always 20hg or so.

When going full throttle the wideband would read 12-12.5 perfect.. Besides the wierd idle car would start right up, Blows no smoke ran great.
Just had the wacky idle.

Fast fwd 100 miles or so and I noticed the wideband on full throttle would be 12.5 / 13.0ish and then i stopped getting on it hard but once in a while i would monitor
and lay into the throttle and see 13-14 almost no 12s. Mind you these were super short pulls. After that I figured this pump seems to be getting a little weak Ill just baby it around.

Went to drive home from work and at light throttle it would drive then just started to buck like it had no power you could put your foot to the floor and just nada wouldn't rev..
Put in neutral REV it and it would feel fine without load. When the bucking would occur the gauge would go really rich sometimes but idle would be lean.

Then I came to a red light and it would stall out repeatedly.. Wideband would read rich when this was happening sometimes and at idle it would be pegged lean.

Went back to work for 4 hours and when I left still had my idle issue but car drove fine. * sweet made it home *

So now that the troubleshooting has begun I have no clue what it is. I have no codes occasionally ill get a maf code but I believe that maybe from the VENTED BOV.

If I go and cold start it , it idles high but steady at 1800 but doesnt try to stall, Once it gets warm wants to stall right out and you cannot drive it, it will hover at 700rpm/1000rpm
If you rev it in neutral parked it pretty much revs fine and smooth, but you could try a second time and it wont even wanna rev and just falls on its face.

Check out these videos - not the best but if you double click they will go full-screen CLEAR they are 720P HD Should help.. Dying to drive this car!!!


Data log video ( Nissan Data Scan & Wideband while trying to idle )

http://www.youtube.com/embed/YzwJbnROLqY?hd=1

Fuel Pressure Gauge Vid ( not sure what is normal ) Stock Pump. CANT FIGURE OUT how to embed on here

http://www.youtube.com/embed/2GEFLLV0gpg?hd=1



Any help would be appreciated I think maybe part could be a fuel pump but then again im not 100% on that ( ordered walbro 255 regardless ) Just wanna enjoy this car in the perfect weather.

__________________
Daryl G. - SR20's since 97

06 G35 6MT Sedan
92 Sentra SE-R DET - DET Build Thread

98 Sentra SE ( RIP ) 14.2 NA
89 325is ( sold )
94 Sentra SE-R ( sold )
90 CRX SI w/GSR + bolt ons ( sold ) 12sec all motor
00 Jetta GLX VR6 ( sold )

newB13

I believe you have a vacuum leak. The A/F going lean and the 'breathing' affect the engine has would lead me to start there. If the wideband is correct its barely running..that is LEAAAN. I would guess 2 different leaks. 1 that has always been there and another that developed during that first 100 miles. This would explain it running kinda sh*tty...then really sh*tty.

For idling purposes...Fuel pressure seems fine-base is steady, it rises with boost and falls under decel. Under heavy load where a big volume of fuel is being used is a different story though. If its the stock pump it will fall short under high rpm/boost, so the Walbro is required IMO.

Have you done the basics such as TPS, timing, and idle adjustment?

disboijoe

I agree on the vacuum leak. Make yourself a homemade pressure tester and test it! Your gonna need it especially since your car is turbo.

QUiKSR20

SMALL UPDATE -

Issue still present after the following :

WALBRO 255LPH installed
All vacuum lines checked by spraying carb cleaner around. ( appears no leaks )

VAC is steady at 20 for the most part.

Stock pump was dying, Now car runs like when the swap was first complete.. A/Fs are perfect.. 14-15 on partially throttle, Around 11.5-12 on full throttle etc.

BUT IDLE Still sucks, On cold start its 1500 rock solid, once it warms up its 900-2000 over and over and over up down up down.. But drives perfect..

Next will be IACV cleaning I think not sure what else it could be.

jarodnesss

Yeah get IACV cleaned first. Always the best way to go with idle issues.

QUiKSR20

Yep gonna check that and look over my TPS etc

BORI-SER

I had the same problem, I change the tps , iacv not working right and plug was bad, hope the work for you.

QUiKSR20

So you changed the TPS? Or you changed the IACV? I have the ability to monitor with a laptop through console port but for the most part looks normal.