New KA-T setup, STILL doesn't run right.

ONLY for ADVANCED technical discussion about the 240sx!
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StryfeS13
Posts: 517
Joined: Sun Dec 20, 2009 1:55 pm
Car: 1993 Nissan 240SX
Location: Fresno, CA

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Am I the only one on this planet that can't have a running boosted car? Damn!

Here's the mod list:

Supertech 8.6:1 Forged pistons
Eagle forged rods
ACL bearings
ARP main studs
ARP head studs
Fel-pro high pressure headgasket
Ported/Polished/Port matched cylinder head
All new gaskets
New valve seals

Holset H1C turbo
EFI Specialist Tune
Tomei 555CC injectors
Z32 MAF
Walbro 255 LPH fuel pump

Here's the problem:

My car has a consistent miss at idle. When I first started the car it flooded out cylinder 1 and had so much fuel it was leaking out of the exhaust port. I pulled the injector out and reseated it, and the cylinder slowly started picking back up.

I also changed the spark plug and wire for cylinder 1. My car still has a miss. I'm not sure if it's that cylinder anymore, but it's still missing at idle and I'm wondering what could cause this?

Also if I try to rev it up fast at idle it will stumble and sometimes die. But if I slowly rev it up, it will be fine.

There is also a small exhaust leak at my v-band before the o2 sensor.

Here's what I've done:

I pulled out the rail and turned the key to the ON position. (could hear my walbro priming)

No leaks whatsoever from the injectors.

I also checked my oil and it has no smell of gas at all, and is not overfilled or anything. (i'd imagine if gas was in there the dipstick would read higher)




...I have tried two different turbo set ups now, and both times they do this crap. What is up with my motor?

-And before it is said, the timing is notttt off.


User avatar
moso
Posts: 801
Joined: Sat Jul 04, 2009 5:14 pm
Car: 89 240sx ka24de 5spd
90 240sx ka24de RIP

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simple start.......start the motor, let idle. begin pulling one injector clip at a time and narrow it down to which cyl is missing. when you figure that out, check that cyl for spark, noid light the injector wiring and test fire the injector. then compression test the cyl. that should tell you all you need to know.

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biggie
Moderator
Posts: 8302
Joined: Wed Jul 24, 2002 2:31 am
Car: '16 Q70L/'14 Q60S Vert/'19 Armada/'09 FX35
Location: Clemmons, NC

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As mentioned on another forum, bov to atmosphere with draw through setup is probably a large part of the issue.


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