Need Advice! No Power! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

scottie · 06-06-2005, 10:20 AM

Ok here is the setup im running:

Z32 MAF
FPBig28
Greddy FMIC
AEM fpr w/guage
Nismo 740cc
NGK BKR7E plugs
Greddy Spec 2 Controller
Apexi PFC
Walbro 255 pump
Deatchwerks Hardwire kit

Ok. The problem started just a week ago. The car has been professionally tuned by Steve Kan of Gotham Racing. The car was running perfectly for 2 weeks at 16-17 psi. Nothing seems weird, everything was running tip top. So about 5 days ago, i get into the car and everything seems normal, idling fine, revs good with no load. However, once i get going, if the car goes into boost at all, no matter what gear, the car boggs and doesnt do anything, as in no power. If i let off the throttle, and goes back into vacuum, the car will run fine. So basically once the car gets into boost, it does nothing, just boggs and jerks. If i take it easy on the throttle, keeping it out of boost, i seems to drive normal. I pulled the plugs and according to them it seems to be getting too much fuel. Its not the ecu because its been tuned. Each plug looks the exact same, so whatever is happening, its doing it on all cylinders. Can someone point me in the write direction? Here is what i've done so far:

1) Put new plugs in
2) Checked intercooler couplers and all vacuum hoses
3) Checked all my wires to see if a sensor has come unplugged

I know its not wiring like some people suggested, otherwise the car would have never ran perfect before. One thing i did notice before the car started acting like this, is when we were tuning, the car would randomly show lean on the wideband, and only occurred occasionally. Could it possibly be my fpr? Any help from you guys would be greatly appreciated.

-scott

Dousan_PG · 06-06-2005, 11:39 AM

dead coilpack
i had similar problem
get a extra coil pack
swap it in one by one.
mine was anything over 30% throttle no power drop in and out of poewr (never spkd boost though) and ran like shit, get off and accell slow or below 30% and ran fine!

scottie · 06-06-2005, 01:15 PM

Well, the car is not running on 3 cylinders. The car idles and runs smooth and every plug looks the same when i pull it out of the car. Wouldnt a bad coil pack show rich while the other good ones show a good burn on the spark plugs?

-scott

NZO · 06-06-2005, 04:07 PM

You said you checked your piping but this sounds a lot like a boost leak. I'd keep that in the back of my mind if you didnt do an all-out pressure test.

Also PM'ed you.

Dousan_PG · 06-07-2005, 10:54 AM

dood do it
my car wasnt running on three cylinders too and all the plugs wree the same
try it or dont
it only takes 10 mins to swap in another set or one by one.

g2ic02 · 06-07-2005, 11:26 AM

i also had the same problem....ended up being a boost leak....

g2ic02 · 06-07-2005, 12:12 PM

are you using t-bolt clamps??? if you aren't then i recommend using them....i was using shitty aviation clamps at stock boost, they held fine.. Once i turned the boost up to 14 psi, it started leaking after a couple of days(. I changed out clamps and the problem went away.

S13_slidr · 06-07-2005, 07:02 PM

I had the exact same problem and it was also a boost leak like a couple of other people have said.

06-06-2005, 10:20 AM	#1
scottie Zilvia FREAK! Join Date: Nov 2003 Location: asluT Posts: 1,287 Trader Rating: (11) Feedback Score: 11 reviews	Need Advice! No Power! Ok here is the setup im running: Z32 MAF FPBig28 Greddy FMIC AEM fpr w/guage Nismo 740cc NGK BKR7E plugs Greddy Spec 2 Controller Apexi PFC Walbro 255 pump Deatchwerks Hardwire kit Ok. The problem started just a week ago. The car has been professionally tuned by Steve Kan of Gotham Racing. The car was running perfectly for 2 weeks at 16-17 psi. Nothing seems weird, everything was running tip top. So about 5 days ago, i get into the car and everything seems normal, idling fine, revs good with no load. However, once i get going, if the car goes into boost at all, no matter what gear, the car boggs and doesnt do anything, as in no power. If i let off the throttle, and goes back into vacuum, the car will run fine. So basically once the car gets into boost, it does nothing, just boggs and jerks. If i take it easy on the throttle, keeping it out of boost, i seems to drive normal. I pulled the plugs and according to them it seems to be getting too much fuel. Its not the ecu because its been tuned. Each plug looks the exact same, so whatever is happening, its doing it on all cylinders. Can someone point me in the write direction? Here is what i've done so far: 1) Put new plugs in 2) Checked intercooler couplers and all vacuum hoses 3) Checked all my wires to see if a sensor has come unplugged I know its not wiring like some people suggested, otherwise the car would have never ran perfect before. One thing i did notice before the car started acting like this, is when we were tuning, the car would randomly show lean on the wideband, and only occurred occasionally. Could it possibly be my fpr? Any help from you guys would be greatly appreciated. -scott __________________ IG: @scotheocelot

06-06-2005, 11:39 AM	#2
Dousan_PG Post Whore! Join Date: May 2002 Location: Orange County, California Age: 46 Posts: 16,640 Trader Rating: (23) Rides Gallery: Dousan_PG Feedback Score: 23 reviews	dead coilpack i had similar problem get a extra coil pack swap it in one by one. mine was anything over 30% throttle no power drop in and out of poewr (never spkd boost though) and ran like shit, get off and accell slow or below 30% and ran fine! __________________ Aaron Pink GodziRa www.geocities.com/pink_godzira

06-06-2005, 01:15 PM	#3
scottie Zilvia FREAK! Join Date: Nov 2003 Location: asluT Posts: 1,287 Trader Rating: (11) Feedback Score: 11 reviews	Well, the car is not running on 3 cylinders. The car idles and runs smooth and every plug looks the same when i pull it out of the car. Wouldnt a bad coil pack show rich while the other good ones show a good burn on the spark plugs? -scott __________________ IG: @scotheocelot

06-06-2005, 04:07 PM	#4
NZO Zilvia FREAK! Join Date: Mar 2002 Location: Reno, NV Age: 42 Posts: 1,424 Trader Rating: (0) Rides Gallery: NZO Feedback Score: 0 reviews	You said you checked your piping but this sounds a lot like a boost leak. I'd keep that in the back of my mind if you didnt do an all-out pressure test. Also PM'ed you. __________________ sentinelguild.com/nzo/PFCDB/

06-07-2005, 10:54 AM	#5
Dousan_PG Post Whore! Join Date: May 2002 Location: Orange County, California Age: 46 Posts: 16,640 Trader Rating: (23) Rides Gallery: Dousan_PG Feedback Score: 23 reviews	dood do it my car wasnt running on three cylinders too and all the plugs wree the same try it or dont it only takes 10 mins to swap in another set or one by one. __________________ Aaron Pink GodziRa www.geocities.com/pink_godzira

06-07-2005, 11:26 AM	#6
g2ic02 Zilvia Junkie Join Date: Jul 2003 Location: minnesota Posts: 480 Trader Rating: (3) Feedback Score: 3 reviews	i also had the same problem....ended up being a boost leak....

06-07-2005, 12:12 PM	#7
g2ic02 Zilvia Junkie Join Date: Jul 2003 Location: minnesota Posts: 480 Trader Rating: (3) Feedback Score: 3 reviews	are you using t-bolt clamps??? if you aren't then i recommend using them....i was using shitty aviation clamps at stock boost, they held fine.. Once i turned the boost up to 14 psi, it started leaking after a couple of days(. I changed out clamps and the problem went away.

06-07-2005, 07:02 PM	#8
S13_slidr Join Date: Apr 2004 Location: Littleton, CO Age: 41 Posts: 45 Trader Rating: (0) Feedback Score: 0 reviews	I had the exact same problem and it was also a boost leak like a couple of other people have said.