Any problem from installing O/R H w/o a Tune?

texas_mustang · December 25th, 2008, 12:27 PM

If i install my pypes o/r H and I dont tune will i have a problem? I.E. running to rich? or will i just trip a CEL.

zinc02GT · December 25th, 2008, 12:29 PM

It'll trip the light just because the rear o2's are sensing there are no cats... You will run slightly rich, but not enough to hurt anything

Not sure if 05 and up use the same MIL's as 99-04's

texas_mustang · December 25th, 2008, 12:31 PM

I know ill trip a CEL, im just seeing if it'll hurt anything.

1FUN4RD · December 25th, 2008, 12:37 PM

Originally Posted by zinc02GT

It'll trip the light just because the rear o2's are sensing there are no cats... You will run slightly rich, but not enough to hurt anything

Not sure if 05 and up use the same MIL's as 99-04's

Actually I thought it made it run lean because the cats are gone, there is nothing to burn up the unused fuel. Thus tripping the CEL & causing it to try to lean itself out to compensate??

Anyone know for sure?? Rich? Emay??

93hatch · December 25th, 2008, 02:14 PM

ive heard lean too, obd1 FTW

MustangMatt96GT · December 25th, 2008, 06:06 PM

Originally Posted by 93hatch

ive heard lean too, obd1 FTW

Carb FTW....

beefmobile · December 25th, 2008, 07:30 PM

i ran a o/r x without a tune and got the light, i thought the car was running like absolute shit. took the pipe off until i got a tuner. ran much much better.

why isn't this on the 05+ tech forum...?

December 25th, 2008, 12:27 PM	#1
texas_mustang Banned Join Date: Dec 2006 Posts: 2,075 iTrader: 0 reviews	Any problem from installing O/R H w/o a Tune? If i install my pypes o/r H and I dont tune will i have a problem? I.E. running to rich? or will i just trip a CEL.

December 25th, 2008, 12:29 PM	#2
zinc02GT HUGE RED HEADED DUDE W/FIVE-OH 2011 Mustang GT 12.1 @ 116 Join Date: Dec 2007 Location: Alabama Posts: 5,847 iTrader: 1 reviews	It'll trip the light just because the rear o2's are sensing there are no cats... You will run slightly rich, but not enough to hurt anything Not sure if 05 and up use the same MIL's as 99-04's __________________ Mods in garage. Built suspension and gears since posted times.

December 25th, 2008, 02:14 PM	#5
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	ive heard lean too, obd1 FTW __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

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December 25th, 2008, 12:31 PM	#3
texas_mustang Banned Join Date: Dec 2006 Posts: 2,075 iTrader: 0 reviews	I know ill trip a CEL, im just seeing if it'll hurt anything.

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