campbellerman

Hey guys i just bought an aldl cable and i am wanting to start tuning my own car. I did some datalogging a few minutes ago and i saw that my BLM is 160 Which indicates a ?lean? mixture. is this a normal value with all this stuff removed?

car was idleing in closed loop at operating temperature
all data values are in spec
minimum air and tps set

and just on a side note i dont have smog at all its been completely removed but not programmed out yet
and egr valve is on the car but the solenoid and all the vacuum lines have been removed and the ports plugged

xch3no2

Ya 160 is way lean. Check for any vacuum leaks, low fuel pressure.
128 is the BLM goal. You can boost fuel pressure to drive BLM's down until you get your tuning hardware.

campbellerman

i know my egr valve is bad but could just not having it hooked up cause it to run this lean? i am going to pick up a new valve this weekend

xch3no2

An EGR stuck open will lean the mixture.
Just plugging it tends to fattens the mix slightly, during times when EGR operation is commanded.

campbellerman

ok thanks. i am going to get a valve this weekend and hook everything back up theres no reason why this wouldnt help the lean condition right?

xch3no2

If your EGR IS defective your engine will love you for replacing it, it's suffering.

Make sure your exhaust is fully sealed, any leaks can throw O2 readings off.

The EGR would have to be stuck open for the lean symptom, this a less common failure but happens.
Without knowing this is the case, I cannot confirm your last statement.

campbellerman

there is no exhaust leaks and the egr ports are clean. i replaced the valve today and it seems to run better. it is still running 160 block learn though: i have 42 psi at the rail and 38 while running air pump and smog has been removed

xch3no2

It's time to get after the fuel pressure. Use BLM's as a guide.

4oohp wont be very happy w/stock bins.

What are your intake manifolds like? Fuel pump?

The members here have done endless work & posted mind boggling wealth of info.
Your in the right place to learn.

In working with tuning your computer it's best if I hand off to these guys.

As I still have sooo much to learn.
The Rabbit hole is quite deep.
Follow the Rabbit..

campbellerman

this is my 1990 305tpi trans am that i am having the problem with

xch3no2

Ahh I see now.

Maybe * or / between equipment descriptions will also help, I don't always read so good. lol

Add fuel pressure

campbellerman

lol ok i will remember that thanks for all your help now to bump the fuel pressure i will need an adjustable regulator how much do these usually run and what is a good brand that i can look into?

xch3no2

I have used the Jet, it works good, its blue.
Vacuum reference models are useful for some builds, your stocker won't need that.
Other's might have another favorite worth looking at.
You will need to use your diaphragm, or get a new one if yours is hammered.

campbellerman

and the new one just goes in place of the stock regulator cover?

campbellerman

hey i installed an adjustibl regulator today and fuel pressure isnt affecting BLM at all only the INT. im stumped WHY is this thing running lean?? please help

xch3no2

You did not mention what pressure you set, very important.

Be patient while it tries to do it's thing, I got 'fused again w/your vehicle description, can you rearrange/split that up somehow?
I wasted much thought & typing on a 400hp tpi. My bad.

It does take some driving, & cold start, run to temp cycles for the computer to fully adjust within it's capability. To reset the computer getting rid of stored settings disconnect battery for 2 min.

Some tuning gear is next in order, to tune your computer see moates.net
there you will find all the gear you need.

To upgrade your computer to what I'm using see dynamicefi.com

Naturally I recommend the latter.

WARNING!
Our moderator may move this thread to a more appropriate section.

campbellerman

I reset the ecm im going to drive it for a few days and see what happens. car seems to run fine

xch3no2

Way cool
& the reason I gave warning is,
This section is for rather advanced discussion/topics, I mostly just read to learn more in here.

Ronny

iTrader: (1)

Does engine break up or pop pop out exhaust when you accellerate hard?