HELP! installed LTHeaders ,stalls on idle now
04-01-2009, 11:16 PM
#1
Thread Starter
Join Date: Mar 2009
Location: texas
Posts: 6
HELP! installed LTHeaders ,stalls on idle now
ok, I just installed bbk long tube headers with off road bbks shorty x pipe and o2 extensions all hooked up. Now my car idels hard on an off. at idle my rpms go up and down from 600 normal up to 1000 or more then it drops below 500 then dies. It starts back up fine every time. What is going on? Am I running lean and needs to be tuned. My idel sensor was replaced and still this goes on??? ANY HELP WOULD BE GREAT....DO Y'ALL KNOW OF A PLACE THAN CAN DO A GOOD JOB ON TUNING MY CAR WITH A BUDGET IN MIND, GOT LAID OFF 2 MONTHS AGO AND REAL TIGHT ON FUNDS...I LIVE AROUND HW6/290 AREA.
thanks for all your replys
2004 mustang gt automatic
bbk long tubes
trickflow plenuim
75mm throttle body
373 gears
bbk cold air intake
steeda under drive pullies
bbk shorty o/r x pipe
magnaflow cat back
thanks for all your replys
2004 mustang gt automatic
bbk long tubes
trickflow plenuim
75mm throttle body
373 gears
bbk cold air intake
steeda under drive pullies
bbk shorty o/r x pipe
magnaflow cat back
Last edited by blackshadow2004; 04-02-2009 at 11:28 AM.
04-01-2009, 11:40 PM
#3
5th Gear Member
Join Date: Dec 2007
Location: Houston, Tx
Posts: 2,112
Make sure your O2 are hooked up properly. Did you expierence the problem imediatly after your install. Or did it take a while. If it took a while also try cleaning your IAC and MAF, maybe check your fuel filter. If you had the problem instantly i would bet its a problem with your O2 sensors. Does it smell like Gas from your exhaust. Like ALOT of gas smell.
Last edited by GTRACER88; 04-01-2009 at 11:42 PM.
04-02-2009, 07:44 AM
#5
Thread Starter
Join Date: Mar 2009
Location: texas
Posts: 6
my car has not been tuned......this began once I installed headers,,, I drove it open headers to a shop to finish the exhaust and no stalls then.... just after the completion of the 02's and x pipe hook up
04-02-2009, 07:51 AM
#6
Thread Starter
Join Date: Mar 2009
Location: texas
Posts: 6
Make sure your O2 are hooked up properly. Did you expierence the problem imediatly after your install. Or did it take a while. If it took a while also try cleaning your IAC and MAF, maybe check your fuel filter. If you had the problem instantly i would bet its a problem with your O2 sensors. Does it smell like Gas from your exhaust. Like ALOT of gas smell.
I just smell exhaust no gas,,, would un pluging the battery 2 let the comp reset help u think? I am laid off cant aford any more on my right now,, man bad timeing for me......thanks for your quik reply
04-02-2009, 09:36 AM
#8
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Whenever idle problems pop-up you should disconnect the battery for 5-7 minutes to reset the KAM.
There is also generally a need to alter the O2 Transport Delay table to increase the values by 15% to 25%. This table defines the the amount of time in which the PCM expects to see a change in AFR, from the time that it commanded the change--for the current load and rpm.
Most long tube headers move the "front" O2 sensors considerably downstream from OEM location, requiring changes to this table to do things right.
However, the EEC-V PCM adaptive learning process also can learn (within some limits) new values for the transport delay. Resetting the KAM will restart that learning process and there may be enough wiggle room so that altering the table is not necessary.
----------------------------
Also, it appears this needs to be said once again--the rear O2 sensors have nothing to do with engine control--zip, zilch, nada.
All they do is monitor the efficiency of the cats, and trigger a DTC if the cats are found to be lacking...
There is also generally a need to alter the O2 Transport Delay table to increase the values by 15% to 25%. This table defines the the amount of time in which the PCM expects to see a change in AFR, from the time that it commanded the change--for the current load and rpm.
Most long tube headers move the "front" O2 sensors considerably downstream from OEM location, requiring changes to this table to do things right.
However, the EEC-V PCM adaptive learning process also can learn (within some limits) new values for the transport delay. Resetting the KAM will restart that learning process and there may be enough wiggle room so that altering the table is not necessary.
----------------------------
Also, it appears this needs to be said once again--the rear O2 sensors have nothing to do with engine control--zip, zilch, nada.
All they do is monitor the efficiency of the cats, and trigger a DTC if the cats are found to be lacking...
04-02-2009, 05:36 PM
#9
3rd Gear Member
Join Date: Jan 2006
Location: North Carolina
Posts: 903
Whenever idle problems pop-up you should disconnect the battery for 5-7 minutes to reset the KAM.
There is also generally a need to alter the O2 Transport Delay table to increase the values by 15% to 25%. This table defines the the amount of time in which the PCM expects to see a change in AFR, from the time that it commanded the change--for the current load and rpm.
Most long tube headers move the "front" O2 sensors considerably downstream from OEM location, requiring changes to this table to do things right.
However, the EEC-V PCM adaptive learning process also can learn (within some limits) new values for the transport delay. Resetting the KAM will restart that learning process and there may be enough wiggle room so that altering the table is not necessary.
----------------------------
Also, it appears this needs to be said once again--the rear O2 sensors have nothing to do with engine control--zip, zilch, nada.
All they do is monitor the efficiency of the cats, and trigger a DTC if the cats are found to be lacking...
There is also generally a need to alter the O2 Transport Delay table to increase the values by 15% to 25%. This table defines the the amount of time in which the PCM expects to see a change in AFR, from the time that it commanded the change--for the current load and rpm.
Most long tube headers move the "front" O2 sensors considerably downstream from OEM location, requiring changes to this table to do things right.
However, the EEC-V PCM adaptive learning process also can learn (within some limits) new values for the transport delay. Resetting the KAM will restart that learning process and there may be enough wiggle room so that altering the table is not necessary.
----------------------------
Also, it appears this needs to be said once again--the rear O2 sensors have nothing to do with engine control--zip, zilch, nada.
All they do is monitor the efficiency of the cats, and trigger a DTC if the cats are found to be lacking...
