engine braking

nutterbutter · January 30th, 2008, 06:32 PM

Sometimes I like to hear my car gurgle by letting off the gas in 3rd gear at about 2800rpm . yesterday however the check engine light came on when I was doing so. I checked the code and it was lack of HO2 and said my car was lean. is that just cause what i was doing or is my car actually running lean. I don't wanna blow up or anything.

Mustang RacR94 · January 30th, 2008, 06:34 PM

ive never had that problem, and my exhaust gargles alot, and i downshift to hear it do it sometimes, never had a problem

MATT02GT · January 30th, 2008, 06:40 PM

Originally Posted by Mustang RacR94

ive never had that problem, and my exhaust gargles alot, and i downshift to hear it do it sometimes, never had a problem

+1 Ya might wanna check and make sure its getting enough fuel, is there a tune or anything on it?

nutterbutter · January 30th, 2008, 07:01 PM

Yeah i have a custom tune which ive had on the car for several months with no problems. I wasnt sure if maybe I had a partially failing H02 sensor or something... i cleared the code and it hasnt come back. maybe it will just go away.

RyanGT · January 30th, 2008, 07:16 PM

its probably bad o2's.

KingChronic · January 30th, 2008, 07:28 PM

alot of times in tunes you can cut short term fuel trim on decel, which is what makes it pop, and will run it lean, so that could be your trouble.

KingChronic · January 30th, 2008, 07:29 PM

Originally Posted by nutterbutter

Yeah i have a custom tune which ive had on the car for several months with no problems. I wasnt sure if maybe I had a partially failing H02 sensor or something... i cleared the code and it hasnt come back. maybe it will just go away.

probably your STF on decel is pulled, lots of tuners do it, gives it the popping sound.

Trick Tuners · January 30th, 2008, 07:43 PM

Low timing will also make it pop on decel. Sometimes you need to run craploads of timing on decel due to the low air density. Most cars have coasting fuel shutoff too and it will turn the injectors off during decel. If you have a wideband it will peg at 20. There will be no damage and you save gas too. I'd say the code is unrelated and you probably need new o2 sensors. O2 sensors are the key to keeping your engine healthy. Replace them every 30K mi for optimal operation. Some people say you should change your O2s when you change your spark plugs.

January 30th, 2008, 06:32 PM	#1
nutterbutter Regular 2002 GT 88mph @ 1.21 jigawatts Join Date: Apr 2007 Location: Austin, TX Posts: 75 iTrader: 0 reviews	engine braking Sometimes I like to hear my car gurgle by letting off the gas in 3rd gear at about 2800rpm . yesterday however the check engine light came on when I was doing so. I checked the code and it was lack of HO2 and said my car was lean. is that just cause what i was doing or is my car actually running lean. I don't wanna blow up or anything. __________________ 02' GT BBK Headers, Bassani x pipe, SLP LM1, Diablo sport predator w/ custom tune, 4.10's, 18x9 &18x10.5, Nitto 555's, subframe connectors, Eibach Pro-kit, Grill delete, 9k HID kit.

January 30th, 2008, 06:34 PM	#2
Mustang RacR94 MM Fanatic 99 cobra N/A Join Date: Dec 2006 Location: Fayetteville NC Posts: 3,170 iTrader: 0 reviews	ive never had that problem, and my exhaust gargles alot, and i downshift to hear it do it sometimes, never had a problem __________________ 99 Cobra 03 Cobra motor AFCO H/E Pulley JLT CAI BBK L/T off road H/steeda catback SCT MAF Tune 03 cobra pumps HVGC

January 30th, 2008, 07:01 PM	#4
nutterbutter Regular 2002 GT 88mph @ 1.21 jigawatts Join Date: Apr 2007 Location: Austin, TX Posts: 75 iTrader: 0 reviews	Yeah i have a custom tune which ive had on the car for several months with no problems. I wasnt sure if maybe I had a partially failing H02 sensor or something... i cleared the code and it hasnt come back. maybe it will just go away. __________________ 02' GT BBK Headers, Bassani x pipe, SLP LM1, Diablo sport predator w/ custom tune, 4.10's, 18x9 &18x10.5, Nitto 555's, subframe connectors, Eibach Pro-kit, Grill delete, 9k HID kit.

January 30th, 2008, 07:28 PM	#6
KingChronic Gun Whore 04 Whipple Cobra 10.61@129.96 Join Date: Dec 2007 Location: Alexandria, VA Posts: 2,438 iTrader: 0 reviews	alot of times in tunes you can cut short term fuel trim on decel, which is what makes it pop, and will run it lean, so that could be your trouble. __________________ Modded Mustangs Make-A-Wish for Bubba "BWAL09" [url]http://www.moddedmustangs.com/forums/clubhouse/112652-hey-guys-mm-needs-unite-bubba.html[/url] [QUOTE=Drgnracin72;1870015]please do this country a favor and go play tag football with an oncoming car[/QUOTE]

January 30th, 2008, 07:43 PM	#8
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	Low timing will also make it pop on decel. Sometimes you need to run craploads of timing on decel due to the low air density. Most cars have coasting fuel shutoff too and it will turn the injectors off during decel. If you have a wideband it will peg at 20. There will be no damage and you save gas too. I'd say the code is unrelated and you probably need new o2 sensors. O2 sensors are the key to keeping your engine healthy. Replace them every 30K mi for optimal operation. Some people say you should change your O2s when you change your spark plugs. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

January 30th, 2008, 07:16 PM	#5
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,258 iTrader: 4 reviews	its probably bad o2's.

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