yeah! This is which way I am leaning with the problem now. I was thinking I might try to get all the injectors flow tested and cleaned like a couple guys suggested. The shop I took it to said something about the injector bandwith being different on the bank two making it lean out...."DUH!!"....but didn't offer any reason for this or how I should try to fix it .Other than saying "somthing is wrong with the computer" Which I think is a cop-out statement that every mechanic sais when he can't figure something out.

So,do you think that I should try the injector cleaner or just do the flow test? I have had so many mixed opinions on injector cleaner it is hard to decide what is right?? Also what kin of pressure should I be getting at W.O.T. compared to idle (which was about 60 psi when the shop checked it)?

 

I've never had any problems with injector cleaner so I wouldn't hesitate, but thats just me. The cleaner's cheaper then the flow test, and if they aren't flowing what they should, they'll probably try cleaning them and see what happens after that so. As far as fuel pressure, it should stay up around 60 psi.

 

Mark, after ready thru this I have an idea. I will call you tomorrow or call me tonight if you are still up.

 

Now that you say someone said one bank is different from the other, sounds like its in the tune now to me.

 

Given that both banks are tuned from a single VE table, I'm interested in your thinking. How can tuning adjust one bank individually?

 

Try spraying some carb cleaner or similar around the edge of the intake and see if it runs rough. I had to replace the intake gasket(s) on my TA because it was throwing lean code and would almost fall on it's face at WOT. Took a while to figure out though, because it was leaking on the INSIDE of the gasket so spraying around the intake didn't change anything as it was still sealing good there.

 

I tried the carb cleaner trick already and got so much cleaner on my detailed throttle body and intake that it started to wrinkle the paint. It didn't idle any different though. I wander if the size of my fuel line would make a difference in the W.O.T. fuel pressure?? I read several threads where everyone is using 1/4in. fuel line. I think mine is 3/8in. Anyone think this could be a factor? I will be buying a fuel pressure gauge for myself and extending it so I can read what is going on when I gas on it.

 

3/8 is bigger than 1/4 so that wouldnt effect FP, if you have 1/4" instead of 3/8" than yes, that would be a problem.

 

Not sure, but the fuel pump may not be able to keep the fuel pressure high enough as the volume being pumped to maintain pressure would be higher in the larger line. Just throwing that out there as food for thought

 

I was thinking along the lines of the "water hose" analogy. If you had two water hoses...one larger than the other.....both have the same spray nozzle and the same water pressure.....the larger one will flow slower with less deliverable pressure than the smaller one when they are both held wide open. However they would work the same if the nozzle was held 1/4 open. you follow what Im thinking??

 

I went back and checked the specs of my fuel pump (#sum-G3138) and it said the pump has a 45GPH free flow and a 85-PSI max fuel pressure. So, I would think that it would have enough pressure to keep up the 60-PSI I read on idle. even on W.O.T.??

 

Hey! Been tryin' to call you. give me a ring tomorrow. I'll bee running around p'cola in the morning.

 

Well it looks like we are leaning back to the possibility of vacume leak. So, my friend suggested we take the intake back off and re-do all the intake o-rings. If for nothing else then to eliminate the possibility. We are also going to buy four new injectors just to see if anything changes. I'll let you know what happens.

 

I follow the thinking, but it happens to be wrong. If you have two lines (the 3/8 and the smaller 1/4) using the same fuel pump and the same ending nozzle - the larger line will deliver more fuel, always. This is because the pump will pressure both lines to the same pressure and the larger line will contain more "stored" volume than the smaller line. Additionally, the volumetric advantage of the larger line becomes more dramatic the longer the distance involved.

 

Thanks for the input.This makes since. I knew there were people on here smarter than me.lol

 

Any update on this,
I'm having a similar problem,

Thanks,
Frank