Running Rich! Help needed

1989 8secmkiii owner · 05-13-2008, 10:32 PM

ddmcse hey where did u get the engine from and is it stock.

supramacist · 05-14-2008, 06:56 AM

It may sound redundant..., but check your timing.

I think these cars naturally run a little rich..., atleast for there age.

Mine does as well. My answer you ask?

A Fuel Pressure Regulator. MSD makes one.

Horsepowerfreaks.com sells them as well.

Don't cheap out and get one from the local parts barn unless you just want to test it before you invest real $$$$ into 1.

You can spend anywhere from 60$ /150$

I personally think something in the 100$ range would suit my needs and maybe yours.

These are just opinions and there's a reason they're free.

ddmcse · 05-14-2008, 10:20 AM

if you are going to modify a turbo'd supra

put an air/fuel meter on it .

air/fuel mix is extremely important for a turbo's supra

there is a reason why these cars run a little rich ,

it's to keep idiots from wrecking the engine once they start to modify things like they know what they are doing

the oxygen sensor could cause it to be a little rich but when i swapped mine out it didn't help.
it was my vsv valves . i tried all kinds of things checked everything , you wonder how a turbo forcing air into the engine could make it rich in the first place .
i replaced the start injector too .

a simple continuity check on the vsv showed it was out of spec . replacing both of them gave me instant gratification with a nice and balanced air/fuel meter ..

you have to have an air/fuel meter if you are going to start messing with a turbo supra .
you need a baseline

supramacist · 05-14-2008, 03:56 PM

Would an air / fuel meter work on an na?

I mean..., I'm sure it would but, how effective would it be?

I ask because I hadn't thought about that.

We n/a's don't have some of the same headaches.

mc_p0pe · 05-14-2008, 08:24 PM

Well, right before i bought the car last summer they had the head gaskets replaced and a new fuel pressure regulator put in... not to mention they hooked up the wrong vaccuum hoses to it and i had to sort it out, but do you think this could be the cause? a cheap fuel regulator...
and i already have a air/fuel gauge

supramacist · 05-14-2008, 08:30 PM

1. I don't condone using cheap parts.

I think we as a collective should strive to use quallity parts to uphold the heritage that is supra.

Just to clear the air. I would only use a cheap one to see if it helps.
That way..., it's only a 20$ if. That you can assuredly return.

Will it aid in running rich? It will certainly monitor the fuel pressure so you can cut it back to make it run "not" so rich.

This is the theory I am operating on.

If I am wrong..., Please correct me. Feel Free.

I'm here to learn as well.

supraflymk3 · 05-23-2008, 12:31 AM

my supra has the same issue except mine is stock.

05-13-2008, 10:32 PM	#1
1989 8secmkiii owner Stock Join Date: May 2008 Location: california Posts: 16	engine ddmcse hey where did u get the engine from and is it stock.

05-14-2008, 10:20 AM	#3
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	if you are going to modify a turbo'd supra put an air/fuel meter on it . air/fuel mix is extremely important for a turbo's supra there is a reason why these cars run a little rich , it's to keep idiots from wrecking the engine once they start to modify things like they know what they are doing the oxygen sensor could cause it to be a little rich but when i swapped mine out it didn't help. it was my vsv valves . i tried all kinds of things checked everything , you wonder how a turbo forcing air into the engine could make it rich in the first place . i replaced the start injector too . a simple continuity check on the vsv showed it was out of spec . replacing both of them gave me instant gratification with a nice and balanced air/fuel meter .. you have to have an air/fuel meter if you are going to start messing with a turbo supra . you need a baseline __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS Last edited by ddmcse; 05-14-2008 at 11:05 AM.

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05-14-2008, 06:56 AM	#2
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	It may sound redundant..., but check your timing. I think these cars naturally run a little rich..., atleast for there age. Mine does as well. My answer you ask? A Fuel Pressure Regulator. MSD makes one. Horsepowerfreaks.com sells them as well. Don't cheap out and get one from the local parts barn unless you just want to test it before you invest real $$$$ into 1. You can spend anywhere from 60$ /150$ I personally think something in the 100$ range would suit my needs and maybe yours. These are just opinions and there's a reason they're free.

05-14-2008, 03:56 PM	#4
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	Would an air / fuel meter work on an na? I mean..., I'm sure it would but, how effective would it be? I ask because I hadn't thought about that. We n/a's don't have some of the same headaches.

05-14-2008, 08:24 PM	#5
mc_p0pe Stock Join Date: May 2008 Location: Coos Bay, OR Posts: 11	Well, right before i bought the car last summer they had the head gaskets replaced and a new fuel pressure regulator put in... not to mention they hooked up the wrong vaccuum hoses to it and i had to sort it out, but do you think this could be the cause? a cheap fuel regulator... and i already have a air/fuel gauge

05-14-2008, 08:30 PM	#6
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	1. I don't condone using cheap parts. I think we as a collective should strive to use quallity parts to uphold the heritage that is supra. Just to clear the air. I would only use a cheap one to see if it helps. That way..., it's only a 20$ if. That you can assuredly return. Will it aid in running rich? It will certainly monitor the fuel pressure so you can cut it back to make it run "not" so rich. This is the theory I am operating on. If I am wrong..., Please correct me. Feel Free. I'm here to learn as well.

05-23-2008, 12:31 AM	#7
supraflymk3 Stock Join Date: Mar 2008 Location: Utah Posts: 14	my supra has the same issue except mine is stock.