SR is running rich then dies HELP!!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Maximum effort · 08-12-2016, 02:38 AM

So I need some help guys, I swapped to a top mount turbo on my SR and a external tial 38mm wastegate and when I fired it up for the first time it ran really lean then came back to ~14.7 until I bleeped the throttle and then it died while coming down. Now when I fire it up it goes full rich until it finally dies and won't idle or anything, so far this is what I've checked.

Fuel pressure is good
Wastegate and aem truboost are hooked up as per aem
Timing is correct
Oil feed and return is correct and not leaking.
Maf is plugged in and grounded.

I'm going to double check vacuum lines but I'm pretty sure they are good to go, can just changing the position of the turbo on these motors really need a retune to idle? I can't figure this out guys and any help is appreciated.

Btw so far the car has
Fmic, don't know the brand
Tomei FPR
CX racing turbo (6063) and manifold, I figured I would give them a shot
Custom down pipe
550cc injectors as per the retard I bought the car from
Walbro 255 pump
Aem truboost ebcs
Tial 38mm ewg

KAT-PWR · 08-12-2016, 06:47 AM

Changing injector size means you need a tune. It's an ecu from the 90s not a super computer.

jedi03 · 08-12-2016, 08:02 AM

tune...even supercomputers need to be reprogrammed if something changes...

cotbu · 08-12-2016, 10:59 AM

did you guys even read that fuckery? plus this

Quote:

550cc injectors as per the retard I bought the car from

my guess is he has a z32 or non stock mafs as well... the fuckery continues.
i bet there's codes too!

Maximum effort · 08-12-2016, 11:59 AM

The car was tuned for everything I listed except the manifold and downpipe. It we as tuned by rs enthalpy, and yes it has a z32 maf

koukimonst3r · 08-12-2016, 12:14 PM

I had a similar problem and won't get a proper idle, turns out my IACV was dirty.

Maximum effort · 08-12-2016, 04:23 PM

**UPDATE**

if I unplug the maf it runs almost perfect but I cleaned it and pluged it back in and it still does the same shit

justinbyrant · 08-12-2016, 04:30 PM

so before the fuckery continues, a little more info is needed, the car ran, you parked it and swapped the turbo and now it runs like shit? or the car hasn't ran except for how it was tuned before you owned it or x amount of time ago and you swapped this stuff and still cant get it to run?

pull your fuel rail with everything hooked up and see if any injectors are leaking, a lot of people who swap injectors reuse the old shitty o rings or don't grease them putting the injectors in, the o ring rolls and you leak extra fuel into the cylinder

Maximum effort · 08-12-2016, 04:49 PM

The car ran properly and was tuned for all of the parts that were on it before I swapped the turbo and manifold. The tune that is on the car is from rs enthalpy. The only thing I did was the turbo,which is the same size, the manifold and the external wastegate

Frank_Jaeger · 08-13-2016, 07:40 PM

Quote:

Originally Posted by jedi03

tune...even supercomputers need to be reprogrammed if something changes...

Irrelevant to the thread but I was going to say this.

koukimonst3r · 08-14-2016, 06:54 AM

Could be your MAF or MAF wiring

justinbyrant · 08-15-2016, 10:24 AM

I would check everything you had to remove to swap the turbo, was anything welded when you installed the parts, for instance welded the dump pipe after swapping the manifold to make sure the fitment was good? you could have broken maf wiring when removing or reinstalling it, maybe damaged the cas housing or plug? I would start checking everything in that area

kruked · 08-15-2016, 11:28 AM

Can I please have a picture of the driver side of your engine bay? I want to see how shit looks around your exhaust manifold. Just take an overhead picture.

Maximum effort · 08-15-2016, 12:08 PM

I think it's just the tune, maf is good but it went from a stock size turbo inlet to a 2.75 and I think that's fucking with the tune

justinbyrant · 08-15-2016, 12:27 PM

Quote:

Originally Posted by Maximum effort

I think it's just the tune, maf is good but it went from a stock size turbo inlet to a 2.75 and I think that's fucking with the tune

it wouldn't do nearly enough to make a difference

I will lay down money something got broke and wasn't noticed when you were swapping parts

jedi03 · 08-15-2016, 03:09 PM

Quote:

Originally Posted by Maximum effort

**UPDATE**

if I unplug the maf it runs almost perfect but I cleaned it and pluged it back in and it still does the same shit

...maf more likely than not or tune for maf, could also be orientation of maf too

kruked · 08-15-2016, 04:24 PM

I'm thinking that the MAFS is too close to the turbo but I don't know because the OP hasn't uploaded a picture yet.

shaggyjake · 08-16-2016, 08:57 AM

Do you need help uploading the picture?

08-12-2016, 02:38 AM	#1
Maximum effort Join Date: Aug 2016 Location: Ventura Age: 35 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	SR is running rich then dies HELP!!! So I need some help guys, I swapped to a top mount turbo on my SR and a external tial 38mm wastegate and when I fired it up for the first time it ran really lean then came back to ~14.7 until I bleeped the throttle and then it died while coming down. Now when I fire it up it goes full rich until it finally dies and won't idle or anything, so far this is what I've checked. Fuel pressure is good Wastegate and aem truboost are hooked up as per aem Timing is correct Oil feed and return is correct and not leaking. Maf is plugged in and grounded. I'm going to double check vacuum lines but I'm pretty sure they are good to go, can just changing the position of the turbo on these motors really need a retune to idle? I can't figure this out guys and any help is appreciated. Btw so far the car has Fmic, don't know the brand Tomei FPR CX racing turbo (6063) and manifold, I figured I would give them a shot Custom down pipe 550cc injectors as per the retard I bought the car from Walbro 255 pump Aem truboost ebcs Tial 38mm ewg

08-12-2016, 06:47 AM	#2
KAT-PWR Nissanaholic! Join Date: Dec 2011 Location: US Posts: 2,040 Trader Rating: (11) Rides Gallery: KAT-PWR Feedback Score: 11 reviews	Changing injector size means you need a tune. It's an ecu from the 90s not a super computer. __________________ MRP Manufacturing

08-12-2016, 12:14 PM	#6
koukimonst3r Zilvia Junkie Join Date: Jul 2009 Location: Vancouver, B.C. Posts: 333 Trader Rating: (6) Feedback Score: 6 reviews	I had a similar problem and won't get a proper idle, turns out my IACV was dirty. __________________ ig : koukimonst3r

08-14-2016, 06:54 AM	#11
koukimonst3r Zilvia Junkie Join Date: Jul 2009 Location: Vancouver, B.C. Posts: 333 Trader Rating: (6) Feedback Score: 6 reviews	Could be your MAF or MAF wiring __________________ ig : koukimonst3r

08-15-2016, 11:28 AM	#13
kruked Nissanaholic! Join Date: Feb 2012 Location: Clearwater, Fl. Posts: 2,293 Trader Rating: (37) Feedback Score: 37 reviews	Can I please have a picture of the driver side of your engine bay? I want to see how shit looks around your exhaust manifold. Just take an overhead picture. __________________ S13 coupe, KA-t

08-12-2016, 08:02 AM	#3
jedi03 Nissanaholic! Join Date: Jul 2008 Location: albuquerque Posts: 1,842 Trader Rating: (8) Feedback Score: 8 reviews	tune...even supercomputers need to be reprogrammed if something changes...

08-12-2016, 11:59 AM	#5
Maximum effort Join Date: Aug 2016 Location: Ventura Age: 35 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	The car was tuned for everything I listed except the manifold and downpipe. It we as tuned by rs enthalpy, and yes it has a z32 maf

08-12-2016, 04:23 PM	#7
Maximum effort Join Date: Aug 2016 Location: Ventura Age: 35 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	UPDATE if I unplug the maf it runs almost perfect but I cleaned it and pluged it back in and it still does the same shit

08-12-2016, 04:30 PM	#8
justinbyrant Zilvia Member Join Date: May 2011 Location: eugene Age: 33 Posts: 229 Trader Rating: (0) Feedback Score: 0 reviews	so before the fuckery continues, a little more info is needed, the car ran, you parked it and swapped the turbo and now it runs like shit? or the car hasn't ran except for how it was tuned before you owned it or x amount of time ago and you swapped this stuff and still cant get it to run? pull your fuel rail with everything hooked up and see if any injectors are leaking, a lot of people who swap injectors reuse the old shitty o rings or don't grease them putting the injectors in, the o ring rolls and you leak extra fuel into the cylinder

08-12-2016, 04:49 PM	#9
Maximum effort Join Date: Aug 2016 Location: Ventura Age: 35 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	The car ran properly and was tuned for all of the parts that were on it before I swapped the turbo and manifold. The tune that is on the car is from rs enthalpy. The only thing I did was the turbo,which is the same size, the manifold and the external wastegate

08-15-2016, 10:24 AM	#12
justinbyrant Zilvia Member Join Date: May 2011 Location: eugene Age: 33 Posts: 229 Trader Rating: (0) Feedback Score: 0 reviews	I would check everything you had to remove to swap the turbo, was anything welded when you installed the parts, for instance welded the dump pipe after swapping the manifold to make sure the fitment was good? you could have broken maf wiring when removing or reinstalling it, maybe damaged the cas housing or plug? I would start checking everything in that area

08-15-2016, 12:08 PM	#14
Maximum effort Join Date: Aug 2016 Location: Ventura Age: 35 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	I think it's just the tune, maf is good but it went from a stock size turbo inlet to a 2.75 and I think that's fucking with the tune

08-15-2016, 04:24 PM	#17
kruked Nissanaholic! Join Date: Feb 2012 Location: Clearwater, Fl. Posts: 2,293 Trader Rating: (37) Feedback Score: 37 reviews	I'm thinking that the MAFS is too close to the turbo but I don't know because the OP hasn't uploaded a picture yet. __________________ S13 coupe, KA-t

08-16-2016, 08:57 AM	#18
shaggyjake Zilvia Member Join Date: Dec 2014 Location: Texan in California Age: 35 Posts: 185 Trader Rating: (1) Feedback Score: 1 reviews	Do you need help uploading the picture?