Short term fuel trim & Long term fuel trim
 

I was using a scantool and reading the live data of the the engine. What are Long & Short fuel trims ? What should the readings be for a normal operating engine ? http://images.honda-tech.com/set1//smile/emcrook.gif

Re: Short term fuel trim & Long term fuel trim (mundo)
 

short term trim is immediate changes made during closed loop
long term is average amount of change that is made over time

Re: Short term fuel trim & Long term fuel trim (mundo)
 

what about the readings

Re: Short term fuel trim & Long term fuel trim (mundo)
 

Running rich, lean, etc..?

Re: Short term fuel trim & Long term fuel trim (mundo)
 

Here's a some good tech info about short and long term adjustments :

http://www.hondata.com/techclosed.html

Re: Short term fuel trim & Long term fuel trim (mundo)
 

Thanks https://honda-tech.com/forums/images/smilies/emthup.gif