PLEASE HELP! 94 rx7 running ROUGH!

t2ae · 12-29-2012, 09:29 AM

Hello everyone i really hope you guys can help me out. I'll start out with the background and mods as far as i know of the car...

Approx. 100k chassis miles and only 18k on rebuilt engine from revinsevens

Car was originally Montego Blue then painted white. Engine bay is flat black.

Rebuilt 13Brew short block w/approx. 18k miles

All components (alt, manifolds, belts, pumps, etc...) have approx. 40k miles on them.

Tweakit racing idler pulley

AC & Emissions pump deleted.

SS braided oil & power steering lines

Dual oil coolers

Aftermarket Earls oil cooler

Dual Supra fuel pumps

SS braided -8 & -6 fuel lines

Rotary Works full 3" exhaust

Megan 3" DP

Portmatched LIM

Act 6 puck sprung clutch and HD pressure plate

JDM 5 speed transmission w/approx. 20k miles on it

Stance Coilovers

18x10.5 +25 XXR WHEELS

Interior

Cobalt Wideband A/F gauge

Prosport Oil pressure, oil temp, & boost gauges

Rewired fuel pump

Relocated optima red top battery to passenger bin

Custom pearl white paint

Shine Auto Feed Sidesteps

Shine Auto Feed Front Bumper

99spec turn lamps

99spec tail lamps

....with that being said i just purchased this car as is running poorly. It has a jdm harness with american ecu. The problem persist of the vehicle overall running very poorly. sounds like its a bridge port while running even though its not. its running on both rotors as i have verified fuel,spark for both. i have replaced the spark plugs,wires radiator and coolant. now as far as questions go i am having trouble finding out if this is fuel or ignition related. as it does have the dual supra fuel pumps on the stock fpr and injectors. all emmisions are removed with the solenoids still plugged up just not active. there is a pretty bad exhaust leak at the manifold where it meets the block. any imputs you guys could give me would be great. i will be testing the fuel pressure tonight as well.

t2ae · 12-29-2012, 09:31 AM

compression as well is right at 95psi on each face

Topgear · 12-29-2012, 07:20 PM

It could be loads of things mate first I would check you map sensor and all vacuum pipes

t2ae · 12-30-2012, 09:47 AM

found fuel pressure at idle at 75psi

t2ae · 01-02-2013, 02:57 PM

bump

Fendamonky · 01-07-2013, 03:10 PM

Quote:

Originally Posted by t2ae

found fuel pressure at idle at 75psi

That fuel pressure is WAAAYYYYY too high imo! Stock pressure is meant to be 43.5psi.

I'm no tuner or a professional by any means, but I'd seriously look into turning that down.

Maybe i missed it, but what ecu are you running?

Negri · 01-29-2013, 04:41 AM

Yea true about the fuel pressure it has to be between 40 @ 45 psi if you have a wide band you can tweek it till when its idleing at arround 13 pn air fuel ratio give or take depending on mods and setup

t2ae · 04-24-2013, 11:15 AM

so found electrical tape jammed in the primary fuel rail lol. thus causing pressure to be sky high

ElTeeFauci · 04-24-2013, 11:40 AM

wow... first time I've ever heard of that happening.

t2ae · 04-24-2013, 12:17 PM

yea me too, still battling this first start issue though

12-29-2012, 09:29 AM	#1
t2ae The Newbie Join Date: Sep 2012 Posts: 12 Rep Power: 0	PLEASE HELP! 94 rx7 running ROUGH! Hello everyone i really hope you guys can help me out. I'll start out with the background and mods as far as i know of the car... Approx. 100k chassis miles and only 18k on rebuilt engine from revinsevens Car was originally Montego Blue then painted white. Engine bay is flat black. Rebuilt 13Brew short block w/approx. 18k miles All components (alt, manifolds, belts, pumps, etc...) have approx. 40k miles on them. Tweakit racing idler pulley AC & Emissions pump deleted. SS braided oil & power steering lines Dual oil coolers Aftermarket Earls oil cooler Dual Supra fuel pumps SS braided -8 & -6 fuel lines Rotary Works full 3" exhaust Megan 3" DP Portmatched LIM Act 6 puck sprung clutch and HD pressure plate JDM 5 speed transmission w/approx. 20k miles on it Stance Coilovers 18x10.5 +25 XXR WHEELS Interior Cobalt Wideband A/F gauge Prosport Oil pressure, oil temp, & boost gauges Rewired fuel pump Relocated optima red top battery to passenger bin Custom pearl white paint Shine Auto Feed Sidesteps Shine Auto Feed Front Bumper 99spec turn lamps 99spec tail lamps ....with that being said i just purchased this car as is running poorly. It has a jdm harness with american ecu. The problem persist of the vehicle overall running very poorly. sounds like its a bridge port while running even though its not. its running on both rotors as i have verified fuel,spark for both. i have replaced the spark plugs,wires radiator and coolant. now as far as questions go i am having trouble finding out if this is fuel or ignition related. as it does have the dual supra fuel pumps on the stock fpr and injectors. all emmisions are removed with the solenoids still plugged up just not active. there is a pretty bad exhaust leak at the manifold where it meets the block. any imputs you guys could give me would be great. i will be testing the fuel pressure tonight as well.

04-24-2013, 11:40 AM	#9
ElTeeFauci Tuned by... ME! Join Date: Mar 2013 Location: Jacksonville, FL Posts: 75 Rep Power: 13	wow... first time I've ever heard of that happening. __________________ Its a big sh!t sandwich... and we're all gonna have to take a bite...

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12-29-2012, 09:31 AM	#2
t2ae The Newbie Join Date: Sep 2012 Posts: 12 Rep Power: 0	compression as well is right at 95psi on each face

12-30-2012, 09:47 AM	#4
t2ae The Newbie Join Date: Sep 2012 Posts: 12 Rep Power: 0	found fuel pressure at idle at 75psi

01-02-2013, 02:57 PM	#5
t2ae The Newbie Join Date: Sep 2012 Posts: 12 Rep Power: 0	bump

01-29-2013, 04:41 AM	#7
Negri negri Join Date: Oct 2012 Location: fayetteville nc Posts: 8 Rep Power: 0	Yea true about the fuel pressure it has to be between 40 @ 45 psi if you have a wide band you can tweek it till when its idleing at arround 13 pn air fuel ratio give or take depending on mods and setup

04-24-2013, 11:15 AM	#8
t2ae The Newbie Join Date: Sep 2012 Posts: 12 Rep Power: 0	so found electrical tape jammed in the primary fuel rail lol. thus causing pressure to be sky high

04-24-2013, 12:17 PM	#10
t2ae The Newbie Join Date: Sep 2012 Posts: 12 Rep Power: 0	yea me too, still battling this first start issue though