stock, camming? (video) - SRT Forums

SRT-4_ACR · 06-16-2008, 07:08 PM

okay lets see... ive noticed this for awhile but never checked it out...

1.usually when i cold start it doesnt start right away
2. when it does start the wideband has no reading
3.usually it lobes like if i had new cams but motor is stock

i really dont know how to read the wideband that well but i think its running rich? correct me if im wrong please

and does anyone know why it lobes like this? it usually chopps harder than it does in the vid... and also usually does it when i cold start then when it warms it goes away kinda but then does it when im idling

its like 3 mins long

Test.......

CIVICEATER · 06-16-2008, 07:25 PM

Your running very lean at idle.

Ghowie · 06-16-2008, 07:57 PM

Without a doubt lean you should be between 14.5 and 15.1 the higher the # the leaner you are running. the wideband goes blank cause at like 18 or so it's as far as the wideband reads. You need to add fuel at idel and most likely throughout the whole map,but if you have a rising rate fuel pressure regulator add fuel with that by uping the fuel psi untill you get to the high 15's on the wideband then fine tune with the safc untill you get it in the target area of 14.5/15.1 using the safc to make BIG adjustments will only cause the pcm to freak wich is why the regulator should be used to make biger adjustments and the safc to fine tune it
The pcm is seeing it and adds fuel thats why it bounces back and forth and you get that hicup. Buy a scan gauge so you can get the fuel trims straight and the car running right and get it to a dyno to tune the rest of it in before you lose a motor. IN boost you want your afr's in the low 11's to high 11's

Pm me your safc map settings,base fuel psi if you have a rrfpr,and you mod list and maybe I can help you a little

SRT-4_ACR · 06-16-2008, 09:07 PM

Quote: Originally Posted by Ghowie

Without a doubt lean you should be between 14.5 and 15.1 the higher the # the leaner you are running. the wideband goes blank cause at like 18 or so it's as far as the wideband reads. You need to add fuel at idel and most likely throughout the whole map,but if you have a rising rate fuel pressure regulator add fuel with that by uping the fuel psi untill you get to the high 15's on the wideband then fine tune with the safc untill you get it in the target area of 14.5/15.1 using the safc to make BIG adjustments will only cause the pcm to freak wich is why the regulator should be used to make biger adjustments and the safc to fine tune it
The pcm is seeing it and adds fuel thats why it bounces back and forth and you get that hicup. Buy a scan gauge so you can get the fuel trims straight and the car running right and get it to a dyno to tune the rest of it in before you lose a motor. IN boost you want your afr's in the low 11's to high 11's

Pm me your safc map settings,base fuel psi if you have a rrfpr,and you mod list and maybe I can help you a little

well i dont have a Fuel controller

Stage 1 comp is controlling it... i have the AVC-R next to my boost gauge... when i WOT in 3rd my wideband reads 11.8 and at redline its at 12.7

so all i would need it an AFC to set it proberly and a dyno tune? would it be safe to get some S2 or 650's injectors?

ooh and one more thing... also alot of times at idle i can smell exhaust fumes, popped the hood once and saw a little smoke coming from the manifold i think... could this be because im too lean?

and i lost the pop and gurgle from the exhaust

SRT-4_ACR · 06-18-2008, 04:26 PM

bizzump...

KlugSRT-4 · 06-18-2008, 05:08 PM

Quote: Originally Posted by SRT-4_ACR

well i dont have a Fuel controller

Stage 1 comp is controlling it... i have the AVC-R next to my boost gauge... when i WOT in 3rd my wideband reads 11.8 and at redline its at 12.7

so all i would need it an AFC to set it proberly and a dyno tune? would it be safe to get some S2 or 650's injectors?

ooh and one more thing... also alot of times at idle i can smell exhaust fumes, popped the hood once and saw a little smoke coming from the manifold i think... could this be because im too lean?

and i lost the pop and gurgle from the exhaust

It should not matter how big your injectors are at idle. Stock is plenty for idle. It wouldnt even matter if you were running HIGH hp engine, stock injectors should idle just fine. Higher rpms is where bigger injectors come into play.

I am going to guess you have a exhaust leak before the upper O2 that is throwing the computer off at idle. It is WAY to lean at idle.

SRT-4_ACR · 06-19-2008, 12:00 PM

Quote: Originally Posted by KlugSRT-4

It should not matter how big your injectors are at idle. Stock is plenty for idle. It wouldnt even matter if you were running HIGH hp engine, stock injectors should idle just fine. Higher rpms is where bigger injectors come into play.

I am going to guess you have a exhaust leak before the upper O2 that is throwing the computer off at idle. It is WAY to lean at idle.

hm... thought about that but never looked into it...

is there any other way of checking instead of taking it off?

DPETRIE · 06-19-2008, 12:21 PM

Get back there and check all your exhaust manifold bolts. Do you have a 3" o2 housing? If you do check those bolts as well and report back.

SRT-4_ACR · 06-19-2008, 04:33 PM

Quote: Originally Posted by DPETRIE

Get back there and check all your exhaust manifold bolts. Do you have a 3" o2 housing? If you do check those bolts as well and report back.

yea i have a MPx 3'' o2... i was thinking it was cracked...

i'll have to check tomorrow morning... its pouring outside

mistabones · 06-22-2008, 01:14 PM

bump! i been having the same problem

madwax · 06-22-2008, 01:28 PM

Replace the oxygen sensor lately? Mine was doing that at idle, had to just touch the gas and raise the RPM's a little and it would go away. That was on the downstream one. Didn't get a code either.

uncommon© · 06-22-2008, 01:46 PM

o2 sensor, fuel pressure & exhaust leak all come to mind ...

I would also pick up a scan gauge & monitor the STFT (short term fuel trims) at idle

SRT-4_ACR · 06-22-2008, 09:43 PM

Thanks for all the replys...

i have brand new o2 sensors...

i think its an Exhaust Leak for me, because i can smell exhaust funes through the A/C vents when im at a stop.....

Commoncontext · 07-10-2008, 04:25 PM

You defiantly have an exhaust leak. mine was doing the same thing. When the person before me had the car they put the 3"o2 cat replacing peace on with just three bolts. The gasket was shot. But as soon as i fixed it its was fine. Until someone cut thru my pipe looking for a cat on my car hehe. I was just pissed cause it cost me 50 bucks to get it welded back together. Gotta love criminals.

SRT-4_ACR · 09-01-2008, 04:22 PM

Quote: Originally Posted by Commoncontext

You defiantly have an exhaust leak. mine was doing the same thing. When the person before me had the car they put the 3"o2 cat replacing peace on with just three bolts. The gasket was shot. But as soon as i fixed it its was fine. Until someone cut thru my pipe looking for a cat on my car hehe. I was just pissed cause it cost me 50 bucks to get it welded back together. Gotta love criminals.

bizzump

yea its an exhaust leak thats causing it

thanks

06-16-2008, 07:08 PM	#1 (permalink)
SRT-4_ACR SRTforums Member Join Date: Jan 2006 Member Number: 37603 Location: Corpus&Baytown Posts: 2,113	stock, camming? (video) okay lets see... ive noticed this for awhile but never checked it out... 1.usually when i cold start it doesnt start right away 2. when it does start the wideband has no reading 3.usually it lobes like if i had new cams but motor is stock i really dont know how to read the wideband that well but i think its running rich? correct me if im wrong please and does anyone know why it lobes like this? it usually chopps harder than it does in the vid... and also usually does it when i cold start then when it warms it goes away kinda but then does it when im idling its like 3 mins long Test....... __________________ http://www.srtforums.com/forums/f426...-gauge-569242/ http://www.srtforums.com/forums/f416...-gauge-569243/ ^^^^^ My partout threads http://www.srtforums.com/forums/f420...-turbo-570158/ WTB^^^

06-16-2008, 07:25 PM	#2 (permalink)
CIVICEATER SRTforums Member Join Date: Aug 2004 Member Number: 16703 Location: Bensalem, PA Posts: 1,032	Your running very lean at idle. __________________ 2003 Solar Yellow SRT-4 FFP 47LB Stage 3 Coolingmist Trunkmount Kit with Varicool Controller MPx 3" Exhaust AGP Intercooler AGP CAI Diablosport Tuner 11.87 - 118.94mph ^^22PSI on HOM (getting kicked out) and no tune

06-16-2008, 07:57 PM	#3 (permalink)
Ghowie SRTforums Member Join Date: Aug 2005 Member Number: 33090 Location: somewhere Posts: 3,740	Without a doubt lean you should be between 14.5 and 15.1 the higher the # the leaner you are running. the wideband goes blank cause at like 18 or so it's as far as the wideband reads. You need to add fuel at idel and most likely throughout the whole map,but if you have a rising rate fuel pressure regulator add fuel with that by uping the fuel psi untill you get to the high 15's on the wideband then fine tune with the safc untill you get it in the target area of 14.5/15.1 using the safc to make BIG adjustments will only cause the pcm to freak wich is why the regulator should be used to make biger adjustments and the safc to fine tune it The pcm is seeing it and adds fuel thats why it bounces back and forth and you get that hicup. Buy a scan gauge so you can get the fuel trims straight and the car running right and get it to a dyno to tune the rest of it in before you lose a motor. IN boost you want your afr's in the low 11's to high 11's Pm me your safc map settings,base fuel psi if you have a rrfpr,and you mod list and maybe I can help you a little __________________ Quote: Originally Posted by dansrt4 For a shop thats so behind maybe you should catch up on orders before you catch up to me.

06-16-2008, 09:07 PM	#4 (permalink)
SRT-4_ACR SRTforums Member Join Date: Jan 2006 Member Number: 37603 Location: Corpus&Baytown Posts: 2,113	Quote: Originally Posted by Ghowie Without a doubt lean you should be between 14.5 and 15.1 the higher the # the leaner you are running. the wideband goes blank cause at like 18 or so it's as far as the wideband reads. You need to add fuel at idel and most likely throughout the whole map,but if you have a rising rate fuel pressure regulator add fuel with that by uping the fuel psi untill you get to the high 15's on the wideband then fine tune with the safc untill you get it in the target area of 14.5/15.1 using the safc to make BIG adjustments will only cause the pcm to freak wich is why the regulator should be used to make biger adjustments and the safc to fine tune it The pcm is seeing it and adds fuel thats why it bounces back and forth and you get that hicup. Buy a scan gauge so you can get the fuel trims straight and the car running right and get it to a dyno to tune the rest of it in before you lose a motor. IN boost you want your afr's in the low 11's to high 11's Pm me your safc map settings,base fuel psi if you have a rrfpr,and you mod list and maybe I can help you a little well i dont have a Fuel controller Stage 1 comp is controlling it... i have the AVC-R next to my boost gauge... when i WOT in 3rd my wideband reads 11.8 and at redline its at 12.7 so all i would need it an AFC to set it proberly and a dyno tune? would it be safe to get some S2 or 650's injectors? ooh and one more thing... also alot of times at idle i can smell exhaust fumes, popped the hood once and saw a little smoke coming from the manifold i think... could this be because im too lean? and i lost the pop and gurgle from the exhaust __________________ http://www.srtforums.com/forums/f426...-gauge-569242/ http://www.srtforums.com/forums/f416...-gauge-569243/ ^^^^^ My partout threads http://www.srtforums.com/forums/f420...-turbo-570158/ WTB^^^ Last edited by SRT-4_ACR; 06-17-2008 at 12:57 AM.

06-18-2008, 04:26 PM	#5 (permalink)
SRT-4_ACR SRTforums Member Join Date: Jan 2006 Member Number: 37603 Location: Corpus&Baytown Posts: 2,113	bizzump... __________________ http://www.srtforums.com/forums/f426...-gauge-569242/ http://www.srtforums.com/forums/f416...-gauge-569243/ ^^^^^ My partout threads http://www.srtforums.com/forums/f420...-turbo-570158/ WTB^^^

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06-18-2008, 05:08 PM	#6 (permalink)
KlugSRT-4 SRTforums Member Join Date: Jan 2007 Member Number: 50458 Location: Midwest Posts: 1,559	Quote: Originally Posted by SRT-4_ACR well i dont have a Fuel controller Stage 1 comp is controlling it... i have the AVC-R next to my boost gauge... when i WOT in 3rd my wideband reads 11.8 and at redline its at 12.7 so all i would need it an AFC to set it proberly and a dyno tune? would it be safe to get some S2 or 650's injectors? ooh and one more thing... also alot of times at idle i can smell exhaust fumes, popped the hood once and saw a little smoke coming from the manifold i think... could this be because im too lean? and i lost the pop and gurgle from the exhaust It should not matter how big your injectors are at idle. Stock is plenty for idle. It wouldnt even matter if you were running HIGH hp engine, stock injectors should idle just fine. Higher rpms is where bigger injectors come into play. I am going to guess you have a exhaust leak before the upper O2 that is throwing the computer off at idle. It is WAY to lean at idle. __________________ LLk

06-19-2008, 12:00 PM	#7 (permalink)
SRT-4_ACR SRTforums Member Join Date: Jan 2006 Member Number: 37603 Location: Corpus&Baytown Posts: 2,113	Quote: Originally Posted by KlugSRT-4 It should not matter how big your injectors are at idle. Stock is plenty for idle. It wouldnt even matter if you were running HIGH hp engine, stock injectors should idle just fine. Higher rpms is where bigger injectors come into play. I am going to guess you have a exhaust leak before the upper O2 that is throwing the computer off at idle. It is WAY to lean at idle. hm... thought about that but never looked into it... is there any other way of checking instead of taking it off? __________________ http://www.srtforums.com/forums/f426...-gauge-569242/ http://www.srtforums.com/forums/f416...-gauge-569243/ ^^^^^ My partout threads http://www.srtforums.com/forums/f420...-turbo-570158/ WTB^^^

06-19-2008, 12:21 PM	#8 (permalink)
DPETRIE SRTforums Member Join Date: Oct 2005 Member Number: 34835 Location: ARLINGTON Posts: 774	Get back there and check all your exhaust manifold bolts. Do you have a 3" o2 housing? If you do check those bolts as well and report back. __________________ "One machine can do the work of fifty ordinary men, but no machine can do the work of one extraordinary man" -Elbert Hubbard

06-19-2008, 04:33 PM	#9 (permalink)
SRT-4_ACR SRTforums Member Join Date: Jan 2006 Member Number: 37603 Location: Corpus&Baytown Posts: 2,113	Quote: Originally Posted by DPETRIE Get back there and check all your exhaust manifold bolts. Do you have a 3" o2 housing? If you do check those bolts as well and report back. yea i have a MPx 3'' o2... i was thinking it was cracked... i'll have to check tomorrow morning... its pouring outside __________________ http://www.srtforums.com/forums/f426...-gauge-569242/ http://www.srtforums.com/forums/f416...-gauge-569243/ ^^^^^ My partout threads http://www.srtforums.com/forums/f420...-turbo-570158/ WTB^^^

06-22-2008, 01:14 PM	#10 (permalink)
mistabones SRTforums Member Join Date: Jun 2005 Member Number: 30097 Location: moody tx Posts: 435	bump! i been having the same problem __________________ [COLOR="Navy"][B]05 Stone White SRT-4 W/ Electric Blue Stripes

06-22-2008, 01:28 PM	#11 (permalink)
madwax SRTforums Member Join Date: Mar 2005 Member Number: 25892 Location: New England Posts: 3,697	Replace the oxygen sensor lately? Mine was doing that at idle, had to just touch the gas and raise the RPM's a little and it would go away. That was on the downstream one. Didn't get a code either. __________________ Mods: AGP GT3076R DBB Turbo, vehicle sold and missed!! "The Cobalt firmly grabs you and whisks you along your way instantly. It does so with authority and poise, but while slipping relatively unnoticed through traffic, never being violent, or dare I say it, frightening. When you ask the SRT-4 to take you somewhere fast, it punches you in the face, throws you over its shoulder, and runs, screaming, so quickly that its tires can barely keep up."

06-22-2008, 01:46 PM	#12 (permalink)
uncommon© Super Moderator SRT of the Month Join Date: Mar 2006 Member Number: 39843 Location: Massachusetts Posts: 34,215	o2 sensor, fuel pressure & exhaust leak all come to mind ... I would also pick up a scan gauge & monitor the STFT (short term fuel trims) at idle __________________ MY FOR SALE THREADS: FS: Ton of stuff for uber cheap FS: Blackberry curves, Jordans & Nike shox

06-22-2008, 09:43 PM	#13 (permalink)
SRT-4_ACR SRTforums Member Join Date: Jan 2006 Member Number: 37603 Location: Corpus&Baytown Posts: 2,113	Thanks for all the replys... i have brand new o2 sensors... i think its an Exhaust Leak for me, because i can smell exhaust funes through the A/C vents when im at a stop..... __________________ http://www.srtforums.com/forums/f426...-gauge-569242/ http://www.srtforums.com/forums/f416...-gauge-569243/ ^^^^^ My partout threads http://www.srtforums.com/forums/f420...-turbo-570158/ WTB^^^

07-10-2008, 04:25 PM	#14 (permalink)
Commoncontext SRTforums Member Join Date: Dec 2007 Member Number: 60072 Location: Riverview,MI Posts: 36	You defiantly have an exhaust leak. mine was doing the same thing. When the person before me had the car they put the 3"o2 cat replacing peace on with just three bolts. The gasket was shot. But as soon as i fixed it its was fine. Until someone cut thru my pipe looking for a cat on my car hehe. I was just pissed cause it cost me 50 bucks to get it welded back together. Gotta love criminals.

09-01-2008, 04:22 PM	#15 (permalink)
SRT-4_ACR SRTforums Member Join Date: Jan 2006 Member Number: 37603 Location: Corpus&Baytown Posts: 2,113	Quote: Originally Posted by Commoncontext You defiantly have an exhaust leak. mine was doing the same thing. When the person before me had the car they put the 3"o2 cat replacing peace on with just three bolts. The gasket was shot. But as soon as i fixed it its was fine. Until someone cut thru my pipe looking for a cat on my car hehe. I was just pissed cause it cost me 50 bucks to get it welded back together. Gotta love criminals. bizzump yea its an exhaust leak thats causing it thanks __________________ http://www.srtforums.com/forums/f426...-gauge-569242/ http://www.srtforums.com/forums/f416...-gauge-569243/ ^^^^^ My partout threads http://www.srtforums.com/forums/f420...-turbo-570158/ WTB^^^

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