exhaust

supra_91 · 03-01-2006, 02:18 PM

everything is fine on my car, plugs, wires, alternator, everything. this just started to happen after i put my header on and got worse after i put in the test pipe

supra_91 · 03-01-2006, 02:19 PM

and yes it is an automatic

supra_91 · 03-01-2006, 11:05 PM

what about the bad gas mileage. before i put the header of i was getting 21mpg but right after i put on the header it dropped down to 11 and eventually got down to where it is now-5mpg. do i need to get a fuel controller or is there something else wrong

mrnickleye · 03-02-2006, 06:52 AM

That's weird !! gas mileage problem. It sure appears to be something other than just doing the header. Is the 02 sensor connected properly??
It is the main sensor for mpg.

supra_91 · 03-02-2006, 02:26 PM

the pacesetter header didn't have an O2 sensor mounting spot on the exhaust manifold, it was on the extension pipe. so i had to extend the wire. theirs nothing wrong with that is there?

i also noticed when i bolted the sensor into place it wasn't sticking into the pipe. do you get what i'm saying?

i also replaced the sensor last summer

mrnickleye · 03-02-2006, 11:27 PM

The 02 should be dounted down into the exhaust gas flow. The wire extension is ok. You might check the intake vacuum system, and you may save time and $$ by having it diagnosed by a pro.

supra_91 · 03-03-2006, 01:37 AM

could the O2 sensor not actually sitting inside the piping cause it to not function properly?

supra_91 · 03-11-2006, 04:15 PM

does anyone know where i can get an O2 simulator for my 1991 supra? do they even make them for that old of a car? since i put in the test pipe my check engine light has come on and this kid that i was talking to said that i needed to get an O2 simulator.

j3pz · 03-03-2006, 11:04 PM

more than likely the gas mileage prob and the shaking are related. it doesnt make any sense that the exhaust would have done anything to the intake or fuel would it? i mean the motor would still burn the same amount and air and fuel right?

03-01-2006, 02:18 PM	#1
supra_91 Lexus & 550's Join Date: Sep 2005 Location: Illinois Posts: 521	everything is fine on my car, plugs, wires, alternator, everything. this just started to happen after i put my header on and got worse after i put in the test pipe __________________ 91 N/A automatic supra;K&N FIPK;2.5" custom exhaust;no cat;pacesetter header;eibach springs;tokico "blues";MKIV TT rims

03-01-2006, 02:19 PM	#2
supra_91 Lexus & 550's Join Date: Sep 2005 Location: Illinois Posts: 521	and yes it is an automatic __________________ 91 N/A automatic supra;K&N FIPK;2.5" custom exhaust;no cat;pacesetter header;eibach springs;tokico "blues";MKIV TT rims

03-01-2006, 11:05 PM	#3
supra_91 Lexus & 550's Join Date: Sep 2005 Location: Illinois Posts: 521	what about the bad gas mileage. before i put the header of i was getting 21mpg but right after i put on the header it dropped down to 11 and eventually got down to where it is now-5mpg. do i need to get a fuel controller or is there something else wrong __________________ 91 N/A automatic supra;K&N FIPK;2.5" custom exhaust;no cat;pacesetter header;eibach springs;tokico "blues";MKIV TT rims

03-02-2006, 06:52 AM	#4
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	That's weird !! gas mileage problem. It sure appears to be something other than just doing the header. Is the 02 sensor connected properly?? It is the main sensor for mpg. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

03-02-2006, 02:26 PM	#5
supra_91 Lexus & 550's Join Date: Sep 2005 Location: Illinois Posts: 521	the pacesetter header didn't have an O2 sensor mounting spot on the exhaust manifold, it was on the extension pipe. so i had to extend the wire. theirs nothing wrong with that is there? i also noticed when i bolted the sensor into place it wasn't sticking into the pipe. do you get what i'm saying? i also replaced the sensor last summer __________________ 91 N/A automatic supra;K&N FIPK;2.5" custom exhaust;no cat;pacesetter header;eibach springs;tokico "blues";MKIV TT rims Last edited by supra_91; 03-02-2006 at 02:39 PM.

03-02-2006, 11:27 PM	#6
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	The 02 should be dounted down into the exhaust gas flow. The wire extension is ok. You might check the intake vacuum system, and you may save time and $$ by having it diagnosed by a pro. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

03-03-2006, 01:37 AM	#7
supra_91 Lexus & 550's Join Date: Sep 2005 Location: Illinois Posts: 521	could the O2 sensor not actually sitting inside the piping cause it to not function properly? __________________ 91 N/A automatic supra;K&N FIPK;2.5" custom exhaust;no cat;pacesetter header;eibach springs;tokico "blues";MKIV TT rims

03-11-2006, 04:15 PM	#8
supra_91 Lexus & 550's Join Date: Sep 2005 Location: Illinois Posts: 521	does anyone know where i can get an O2 simulator for my 1991 supra? do they even make them for that old of a car? since i put in the test pipe my check engine light has come on and this kid that i was talking to said that i needed to get an O2 simulator. __________________ 91 N/A automatic supra;K&N FIPK;2.5" custom exhaust;no cat;pacesetter header;eibach springs;tokico "blues";MKIV TT rims

03-03-2006, 11:04 PM	#9
j3pz 500whp yet? Join Date: Nov 2005 Location: Mechanicsville, MD, US of A, 20659 Posts: 1,060	more than likely the gas mileage prob and the shaking are related. it doesnt make any sense that the exhaust would have done anything to the intake or fuel would it? i mean the motor would still burn the same amount and air and fuel right? __________________ 88 N/A w/ 5spd - stock - not running, bhg 87 turbo/targa w/ 5spd- fidanza light weight flywheel, new oem slave cylinder, apexi air filter, no ac and no heat

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