I'm still having problems with my car, missfires maybe but from what?

[Ttop34]

I haven't been able to mess with the car in a while so I'm just now getting back to this post.

I'm guessing the reason that I'm only getting lean in 3rd is because that's where the FTRA takes effect right? What do I need to fix this? Adjustable fuel pressure regulator or is that already taken care of by the walbro 255? Do I just need MAFT? Do I just need to test out my injectors or possibly upgrade injectors? Is my injector pulse enough? What is too lean exactly, what is perfect and what hurts my car?

I really don't see the KR being related to this though since I also get it in 1st and 2nd gear along with between 2,000 and 2,500 rpm's. For that I'm thinking I just need to desensitize my knock sensor.

[Ttop34]

Oh yeah, why do I always have one side leaner than the other? Could that just be a bad injector? Which side is bank 1 sensor 1 on? Passenger's side right?

[jersey]

hey you best bet is to get your car wideband dynotuned...that should fix your problems

[Seppo Kaitainen]

<blockquote>quote:</font><hr>Originally posted by Ttop34:
I'm guessing the reason that I'm only getting lean in 3rd is because that's where the FTRA takes effect right? What do I need to fix this? Adjustable fuel pressure regulator or is that already taken care of by the walbro 255? Do I just need MAFT? Do I just need to test out my injectors or possibly upgrade injectors? Is my injector pulse enough? What is too lean exactly, what is perfect and what hurts my car?
<hr></blockquote>

You want your O2's to be around .88-.90 at WOT. A maft would give you the ability to richen the car up at WOT. I can not answer your questions about the injectors. But less than .8 O2 readings are very lean.

[OneQuickV6]

Bank 1 Senor 1 is driver's side manifold sensor as I recall. Maybe we need to take a trip to Odessa to get our cars dyno's and wideband AF'd Kendall!

[Ttop34]

I just noticed something really weird, my car gets leaner in each gear. First gear it's fine, 2nd gear it gets to like .850 and then 3rd gear it hits .7's. The only think I can think of is the FTRA pushing in more air but isn't that good? Even if I got MAFT+ or the Mini AFR, would it still be like this?

[OneQuickV6]

I can't see the FTRA causing this...all it does is get more air in for the MAF sensor to add some more fuel. Now if your MAF or TPS sensor was going bad, that could do it.

[WickEdSix9838]

anytime you make a motor mod this big your gonna have to have it tuned, otherwise your not getting the full potential of the swap, and most likely all problems will be solved if you get it tuned...

[Ttop34]

The whole reason I got this cam was because I was told that it would work fine with the stock computer.