I posted this in the computer section too, but there aren't near as many posters there as in here, so here it goes.

Got some logs of my car today to see if I was still getting knock retard. Well, that has pretty much gone away but I found out the BLMs were pretty split up the whole time, from any where from 7-15 between the two. The right side was at like 138 most of the time while the left was mostly normal at 128...

Here it is:
http://anasazi.sytes.net/mikescan/

Anyone have any ideas of the cause?

 

exhaust leak.

 

Nope. I have no exhaust leaks anymore. Possibly a bad/leaky injector? I forgot to mention I only get 15 MPG on an internally stock motor too.

 

ahh yes i forgot about exhaust leaks


i suggested stuck fuel injector because of a sometimes hard start condition

 

Hey Scott,

Yeah me and Brett tightened everything up a couple weeks ago, everything on the exhaust side of things is ok.

 

ttt

 

A couple of things I see in your log file:

On start up, in open loop, your O2 readings start out high and stay there until they start jumping around in closed loop. I have never seen this before.....I'm used to seeing the O2s *ramp* up during open loop.

Your ignition voltage looks low to me. 12.2-12.6 or so. Is the alternator up to snuff?

What are all of your mods?

RobY
95Z28

 

The mods are in the sig. The alternator is maybe 4 months old. I'm not sure about the voltage. What is normal to you?

 

With the cooler weather we've had in FL lately, I'm seeing 13.2-13.4 while cruising.

Have you swapped the O2 sensors from side to side and see if the BLMs follow the sensors?

RobY
95Z28

 

No I haven't. Considering the pain in the *** it is to change them, I don't want to either! But it's worth a shot i suppose. I don't see how the 02's could be bad, they are only like 4 months old too.

 

I don't know if your O2s are bad, they are just showing some things that I haven't seen before, at least not on my car. What's causing that, I don't know. I figured swapping O2s would be easy but I forgot what it's like on the stock manifolds (I've got longtubes).

What is the background on this car and the problem you're seeing? Have you done some work lately that caused this to show up?

What does the Z06 MAF do for you and is the calibration correct? I'm not up on MAF-mods as I've got the stock one.

Vacuum leaks?

 

you probably have an exhaust leak.... i know you said you dont but that is more likely the cause than a leaky injector. your problem is extra air leaking into the system somewhere causing the computer to dump fuel into that bank. remember numbers above 128 is the PCM commanding more fuel.. below 128 is PCM pulling fuel.. 128 is no correction.

I dont have datamaster so i couldnt view that file but what is this problem with the O2 sensors? a bad sensor could raise BLMs on one side too. look to see if A. they start out at 450 mV when cold and B. they fluctuate across the entire 0-1 volt range.

 

Well, I'm getting some shorties and new manifold gaskets, etc. in a week or two, we'll see if it goes away then.