Fuel Injectors
09-29-2010, 11:51 AM
#1
Thread Starter
Join Date: Mar 2010
Location: Michigan
Posts: 36
Fuel Injectors
I just installed 24# injectors on my car and the car runs much smoother then before when I had a intermittent shudder.. now I have a check engine light... would that be because of the upgraded injectors without a tune? I haven't gone to get codes yet but I'm thinking thats the issue..
09-29-2010, 01:49 PM
#4
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
But it's OK to waste our time with a stupid question?
Of course you need to alter the tune, the injectors you chose to install are almost 15% higher capacity than the OEM units.
The car will now be running 15% rich in open loop and in closed loop the short term fuel trims will be centered around -15 to -20% leaving no room for further adjustment to allow for IAT, ECT, fuel quality, etc.
That is likely what is throwing the code(s)--however we don't actually know that and could provide much better feedback if the code(s) were known.
Get them read and post back...
Of course you need to alter the tune, the injectors you chose to install are almost 15% higher capacity than the OEM units.
The car will now be running 15% rich in open loop and in closed loop the short term fuel trims will be centered around -15 to -20% leaving no room for further adjustment to allow for IAT, ECT, fuel quality, etc.
That is likely what is throwing the code(s)--however we don't actually know that and could provide much better feedback if the code(s) were known.
Get them read and post back...
09-30-2010, 03:36 AM
#5
5th Gear Member
Join Date: Aug 2007
Location:
Posts: 3,189
sorry thats such a huge burden for you to stop on your daily activities but without knowing what the code is ACTUALLY for, there is no ACCURATE help that can be given. CEL can be any of hundreds of things, which may or may not even be related to your injector changes. like cliff said, you require a tune when you change injectors, but we can't tell you what the yellow light on your dash means until you tell us what your car says is wrong.
09-30-2010, 11:16 AM
#6
Thread Starter
Join Date: Mar 2010
Location: Michigan
Posts: 36
cliff answered my question and that was the answer i was looking for.. it was a simple *** question that needed a simple answer and the nearest auto zone to me is 20 min away and i didn't have time to stop there because from work i go to school so i'm gone basically from 5am to 10pm so please explain to me when i would have had time? i knew it had to do with the injectors i was just trying to confirm my thoughts... thanks for the help ...
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