Sr20det Swap Idles But Will Not Rev - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jcanady · 07-19-2012, 12:39 PM

Ok, I just swapped a redtop Sr20det into my s13. Its a stock motor with a Gt28r turbo, HKS 555cc injectors, 255 fuel pump, and an RS Enthalpy ECU. I just got the Ecu back from Enthalpy. The car starts immediately and idles beautifully. When I rev it it will not go past 3000 rpm without misfiring and dropping back down in rpms. Since I havent gotten to the exhaust shop yet its basically dumping out underneath me so I can smell its very rich like unburnt fuel. I believe this is causing my problems. Does anyone have any ideas of why it wont rev like this? And yes, I have been researching. Thanks for any input!

c-los13 · 07-19-2012, 12:59 PM

Get a wideband, itll really hard to figure out your problem without one, plus you need make sure your tune is safe
check wiring to the maf, thats usually the most common problem

jcanady · 07-19-2012, 01:03 PM

Yeah I checked the wiring to the maf and that doesnt seem to be the issue.

jcanady · 07-19-2012, 01:19 PM

Well it could be the maf. Out of three wires in the loom, one gets 12v and the other two get nothing. Shouldnt one get 5v?

ultimateirving · 07-19-2012, 03:59 PM

with the maf plugged in, koeo, if you probe the back of the maf, at least 2 of the wires should have voltage coming from them

godsmack · 07-19-2012, 06:17 PM

yea 2 will have power. and your car is going into limp mode.

*brndck* · 07-20-2012, 12:25 AM

+1 on Maf problem.

drift213 · 07-20-2012, 01:07 AM

^^^^^^^^^^^ +1

JDMRIDDAZ · 07-20-2012, 10:13 AM

if wires check out
blk/wht...12v
wht...5 v
blk ground
then its the maf...
wat maf is ecu tuned for?

*wangan_cruiser* · 07-21-2012, 03:10 AM

i am having the same problem. shit wont rev past 3k-4k. about to re check my wiring again. pulled codes threw a 12 afm.

try to check the codes too

jcanady · 07-22-2012, 08:40 AM

I checked the codes and all it does is the led light stays lit and wont blink which i'm assuming means Ecu malfunction. And its tuned for z32 maf which is what i'm using.

07-19-2012, 12:39 PM	#1
jcanady Leaky Injector Join Date: Jun 2012 Location: Atlanta Age: 34 Posts: 133 Trader Rating: (5) Feedback Score: 5 reviews	Sr20det Swap Idles But Will Not Rev Ok, I just swapped a redtop Sr20det into my s13. Its a stock motor with a Gt28r turbo, HKS 555cc injectors, 255 fuel pump, and an RS Enthalpy ECU. I just got the Ecu back from Enthalpy. The car starts immediately and idles beautifully. When I rev it it will not go past 3000 rpm without misfiring and dropping back down in rpms. Since I havent gotten to the exhaust shop yet its basically dumping out underneath me so I can smell its very rich like unburnt fuel. I believe this is causing my problems. Does anyone have any ideas of why it wont rev like this? And yes, I have been researching. Thanks for any input!

07-19-2012, 03:59 PM	#5
ultimateirving Zilvia FREAK! Join Date: Nov 2010 Location: arizona Age: 37 Posts: 1,521 Trader Rating: (1) Feedback Score: 1 reviews	with the maf plugged in, koeo, if you probe the back of the maf, at least 2 of the wires should have voltage coming from them __________________ Z32 with lq4 swap Desert Street Scene \|\| Dssevents.com

07-20-2012, 01:07 AM	#8
drift213 Zilvia FREAK! Join Date: Aug 2009 Location: los angeles Posts: 1,089 Trader Rating: (16) Feedback Score: 16 reviews	^^^^^^^^^^^ +1 __________________ LOTS OF SR20,ka24de,s13 goodies for sale check my threds

07-20-2012, 10:13 AM	#9
JDMRIDDAZ Zilvia Junkie Join Date: Sep 2007 Location: ｆォリダ Age: 48 Posts: 440 Trader Rating: (3) Feedback Score: 3 reviews	if wires check out blk/wht...12v wht...5 v blk ground then its the maf... wat maf is ecu tuned for? __________________ シチサｎ w/ka20det:in progress シチサｎw/sr20det:stolen

07-19-2012, 12:59 PM	#2
c-los13 Zilvia Junkie Join Date: Feb 2010 Location: Edinburg, Texas Age: 36 Posts: 446 Trader Rating: (0) Feedback Score: 0 reviews	Get a wideband, itll really hard to figure out your problem without one, plus you need make sure your tune is safe check wiring to the maf, thats usually the most common problem

07-19-2012, 01:03 PM	#3
jcanady Leaky Injector Join Date: Jun 2012 Location: Atlanta Age: 34 Posts: 133 Trader Rating: (5) Feedback Score: 5 reviews	Yeah I checked the wiring to the maf and that doesnt seem to be the issue.

07-19-2012, 01:19 PM	#4
jcanady Leaky Injector Join Date: Jun 2012 Location: Atlanta Age: 34 Posts: 133 Trader Rating: (5) Feedback Score: 5 reviews	Well it could be the maf. Out of three wires in the loom, one gets 12v and the other two get nothing. Shouldnt one get 5v?

07-19-2012, 06:17 PM	#6
godsmack Zilvia Addict Join Date: Feb 2009 Location: Allentown, PA Age: 39 Posts: 652 Trader Rating: (0) Feedback Score: 0 reviews	yea 2 will have power. and your car is going into limp mode.

07-21-2012, 03:10 AM	#10
wangan_cruiser kouki man Join Date: Apr 2006 Location: downtown oakland,ca Age: 40 Posts: 3,539 Trader Rating: (36) Feedback Score: 36 reviews	i am having the same problem. shit wont rev past 3k-4k. about to re check my wiring again. pulled codes threw a 12 afm. try to check the codes too

07-22-2012, 08:40 AM	#11
jcanady Leaky Injector Join Date: Jun 2012 Location: Atlanta Age: 34 Posts: 133 Trader Rating: (5) Feedback Score: 5 reviews	I checked the codes and all it does is the led light stays lit and wont blink which i'm assuming means Ecu malfunction. And its tuned for z32 maf which is what i'm using.