I am getting a periodic EGR (0400 code) / ACV. Looking at the data stream on my obdii I noticed the 'short term fuel trim B1S1 was 099% and B2S1 was 000% - that seems wacky. Any ideas if that could be related to a dirty ACV/ injector or something else? I'm feeling like the engine might be a bit laggy and the fuel economy isn't great - but that might be msu.

 

is your engine bogging on idle??...cuz can be your EGR valve stuck open...or flows more gas its supposed.....check out for a vacuum leak on this side of the engine too, or as you said maybe an injector leak..take your fuel pressure...

 

Here's an article about fuel trim. does your scanner give you details like in this article? Maybe this can help you ...?
http://findarticles.com/p/articles/m...g=content;col1

There are lots others there too.

 

My idle is high and the only code I'm pulling is the 400. I'll check that article out, thanks - but my obdii checker is very basic.

 

you might wanna check this out.. this was my egrp0400 code.. i didnt have to buy a $150 egr valve..

http://forums.maxima.org/4th-generat...ing-p0400.html