shawn69

Setup
LS/vtec
stock gsr head
stock b18a block
ps9 with 1 wire vtec
turboedit v 3.1.9
dsm 450s
gm 3 bar

I'm just starting to tune my car. I got it to idle fine, when warm.

However if i rev it up the a/f will be around 13, from 1000rpm to 1500rpm, just in neutral no load. At 1500 rpm and about 28inHG it will all of a sudden turn really lean, past what my wideband can read. (over 17:1). So i added more fuel in turboedit at that spot on the map, but the same thing happened. I added almost %30 more fuel in turboedit but nothing changed. So i thought it might be fuel pressure dropping or something like that, i hooked up a gauge and it stays around 44 psi.

The map sensor is putting out the correct voltage, .384 at ~28-30inHg . But i do get code 13, baro. I disabled the code in turboedit, but it will turn back on after like 10 seconds for some reason.


Any ideas of why this is happening?

fumatch

plugged exhaust?

shawn69

It's open downpipe... 3"

If the fuel filter was plugged or old, would i still get good pressure but little volume?

shawn69

Anyone?

After that spot the fuel is back to normal.

I don't think any ignition map would cause it to go so lean.

Does 27-28 inHg seem like alot to anyone?

could the ecu actually think the car is decelerating and cut the injectors?


Modified by shawn69 at 7:12 PM 11/11/2008

fastcrxsi90

can you post a copy of your map?