Car Is Lean at idle no matter how much fuel I add.

[edcmat-l1]

fuel pressure is reading 58 psi. map sensor is 3 bar map that I bought from summit racing Part# 55567257 linear 312.50 and offset -11.25 and my altitude is 72 feet.

Something ain't adding up then. If you're at sea level your Baro should be 100 or so. And I seriously doubt the engine is idling with that much vacuum. Might want to put a mechanical gauge on it to see.

[Rich boy]

On my Turbo G body with Holley Terminator X it reads 100kpa. Do you think I need to play with the offset on the MAP calibration?

[gtstorey]

Does this one have a separate Baro sensor? The values you have for 55567257 match what I can find.

https://dsxtuning.com/products/gm-3-bar-map-55567257

[Rich boy]

Im sorry it doesnt have a barometric sensor on it.

[Rich boy]

Yes thats the part number

[Alvin]

I have an LS 6.0L with a Brain Tooley stage 2 cam and HPI 80lbs injectors with a 78/76 turbo. I have gone into the tune and set it up for speed density. I halved injector flow rate and everything that deals with airmass in g/s and torque based. No matter what I do the scanner is showing that I'm 30+ percent lean at idle. I copy and paste special and multiple by percent and write to the tune file and scan again and it still shows that I'm 30+ percent lean. I have tried the to read in Lamda and it still show the same. I have smoked the intake and the exhaust and there are no leaks. Is there a table that helps it to not be lean at idle? I need help as I have been dealing with this for 2 months now. e

There is no sense in scaling this and you are just making problems for yourself. I wouldn't do this scaled.

[Rich boy]

It doesn't have a baro sensor. I should have deleted that channel.

[Rich boy]

Picture of o2 placement and fuel pressure

[Rich boy]

I set it back to stock and changed the spark tables and set pe and be but left it in speed density

[gtstorey]

It might still have a Baro channel, it just uses the data it sees at key on, engine off to fill it in. Does the Baro and Map match at key on, engine off?

[edcmat-l1]

The Baro reading is taken from the MAP key on engine off. That being off, as well as the idle MAP reading means something ain't right. If the Linear and offset are correct then there's a problem with the wiring or sensor.

[Rich boy]

I'll take a look at the wiring

[Rich boy]

I checked the 5-volt reference with sensor unplugged and it is 5 volts. I then plugged the sensor up and back probed it KOEO and I'm getting 1.80 volts on the 5-volt reference wire which is number 1 in the plug and with KOEO on the signal wire I'm getting -.80 volts when back probing. At idle I'm getting close to those same numbers.

[Rich boy]

Yes they match

[gtstorey]

Yes they match

Match at what value? (pressure not voltage)

[Rich boy]

I figured it out. The adapter that i bought to go from a ls1 to the ls9 wire was broke on the 5-volt reference wire. I fixed it and now its reading 104 kPa.

[Rich boy]

@edcmat-l1 you were right. It was the wiring. The adapter that i bought to go from an LS1 to LS3 map sensor wire was broken on the 5-volt reference wire. I'm reading 104 kPa now. Thank you so much for your help. It is much appreciated.

[edcmat-l1]

Good deal. That should get you closer just having that reading correctly now.

[Rich boy]

Can you look at this and tell me why its trying to idle at 165 kPa?

[edcmat-l1]

You have the wrong MAP pid selected.