ok i have been trying to figure out my lean indiaction for the past few weeks every since the 306 install, well i that been doing everything from playing with fuel pressure to changing o2's. and still nothing, weel today i thought i would unplug the mass air and see what happen to the readings and they went straight to 700-800mv on both sides, so that tells me that the o2's arnt the issues. pluged the mass air back in and the o2's went back to what they were doing, low 100mv for the lft side and 30ish mv on the rt side. so i took off the airfilter assembly and the readings seemed to stready out. havent put the airfilter assembly back on yet. i had cleaned the k/n filter during the install and i might have gotten to much oil on the filter, could this could issues with the mass air reading? when the filter was on it was sucking very loudly. and i also have the mass air descrened, im trying to fine the issue i am having with the lean indication so any help would be nice.
thanks Sean
here is the pics of the air filter system

 

Yeah, thats a problem with K&N style oiled filters. That's been a recurring problem on the LS GTO website, oiled mass air sensors when people clean them and use too much. What I don't remember is whether or not its permanent.

What strut tower brace are you using. I like it.

 

Try cleaning the MAF with q-tips and rubbing alcohol. Shouldn't have to tell you this but BE CAREFUL WHEN CLEANING THE MAF. The purpose of this is to remove the excess air filter oil and any dirt.

Having the MAF de-screened is a big no-no for an email tune.

Those 2 alone could cause some problems with your tune.

 

im hoping to get a mass air off a buddies wrecked one and see if that helps, it is scened so will see, and also plan on getting a paper filter to see it that changes anything. and the strut tower brace is a edelbrock 3 point.

 

well i have a idea, i have not changed the mass yet, but what do u think about the injectors causeing the issue???? or the fuel pump?????? the pump is only 4 months old and it is a 92 tpi pump, so i wouldnt think it is the fuel pump, but the only reason i was thinking the fuel pump was due to it seems to be on the lft side no matter what i do, the fuel goes in the right side and exits to the left right, well i was thinking that the fuel pump isnt supplying enough volume to substain both sides, but the only thing about that is the pressure is staying good through out the rpm range, that is telling me that the pump is good. so then that leads me back to the fuel injectors. I dont have any idea what else could be causing this issue. and both o2's are new and are cking good. well i guess i need to try the mass then go from there. any other idea would help. thanks Sean

 

Suppose you could try switching sides with the injectors and see if your problem moves. Plugged fuel rail? Mass air seems the most obvious based on the over oiled issue, but doesn't bulls eye with the one side versus the other.

Is the brace originally for a carb or TPI car?

 

yeah thats an idea also, but i have been getting people saying that i need to upgrade fuel injectors

 

are the 02's located in similar spots? Meaning both are on the headers or is one further down on the ypipe?

What are you using to diagnose the LT1?

 

they are both in the headers, i am using my actron scaner that gives all the reading off the sensors, and data master data logger.

I also need to sell my headers so i can get some cash up to get the injectors.

 

You don't need to upgrade the injectors, I know of a person with a '95 with the 306 a set of ported and polished heads and he's still running the stock injectors. His wasn't right until he got Bryan at PCMforless to send him a tune.

 

what are your trouble codes? you can test the MAF by tapping it with a screw driver handle, with the car running if the engine stumbles its bad.

 

i have heard nothing but good things about the guy i had tune mine. but i think it is something else. And i will try tapping on the thing.

 

if you want to clean it, get some electrical parts cleaner and spray it down....it kinda acts like brake parts cleaner because it evaporates quickly...but it smells like white-out. i use the stuff all the time and a lot of things.

 

yeah i did taht and well it isnt the mass air. i ended up changing the other o2 and am waiting to start it up today to see what happens, and also changed the fuel filter since it hadnt been changed in awhile. will have to see after i stat it up today

 

well after it was all said and done changed another o2, and a fuel filter and the issue seems to be gone. i still need to change the oile due to smellin like fuel, but other then that the o2's are tracking right and engine is running smooth. now all i have to do is see if it lasts, then get it on a dyno to see what i can tweek out of it. shooting for 350 rwhp.

 

Gas in the oil indicates cylinders not firing (ignition problem). Sounds like too much gas to me. Hopefully it was a bad O2 sensor telling the computer it was lean when it wasn't.

 

and one of the plug wires came out of the dist, so that is were that came from