Re: Barometer reading off?
What size injectors are you using?
Are you using a wideband? If so, make and model? Are you using a stock narrow band for the ECU?
Were you using a OTC scanner to read the MAP sensor? If so ignore the inch of HG reading, it's gonna be off because the OTC scanner is calibrated to read the voltage and display the inch of hg for a 2 bar map, not a 3 bar map. List the MAP voltage instead.
Are you willing to learn to do the calibration yourself?
Who did the calibration, and are you able to post it?
When the CTS below certain temperature, the engine is not even using the o2 sensor for feedback.
Re: Barometer reading off?
I am using a Snap on scanner. It has +40 injectors and the map reading itself I don’t think is the issue as it’s computing the value correctly (absolute+/-boost or vacuum). It’s just that the absolute pressure reading is wrong from the beginning. I have a wide band but it’s not hooked up yet, running off the O2 right now. I don’t remember the voltage of the map at idle off the top of my head but KOEO was 1.6v.
Re: Barometer reading off?
1st thing to do is to put the wideband in.
Narrow band o2 is useless in tuning car as 11 : 1 afr is the same as 13 : 1 aft to the narrow band sensor.
Re: Barometer reading off?
Quote:
Originally Posted by
moparmike70
When I put the wideband in I have to set the tune up for that correct?
Not necessary and it also depends on the make and model of your wideband.
Wideband with gauge can work independently or you could wire it to the ECU, but not needed and sometimes not recommended as wideband sensor sometimes do not produce the fast rich/lean signal the ECU is looking for.
Your Snap on scanner will only ever show you the in hg of the 2 bar map sensor as that is what is programmed in the scanner. It doesn't know your car have a 3 bar map sensor.
http://hhscott.com/93tmv/images/3BARv2BAR_Map.gif
Re: Barometer reading off?
Quote:
Originally Posted by
moparmike70
just figured the scan tool would read what the ecu puts out and not change it based on the vehicle ID.
All map sensor works in 0-5 voltage. My OTC allows the option for me to read the MAP voltage instead of in hg , then you just use the above map.
Re: Barometer reading off?
I was able to read the first tune and save it on my computer but I can't do anything with it because it saved it as a bin file. From what I've read you can't read the bin file unless you have the matching asm file? I would assume that BB has the asm files. I haven't finished hooking up the A/F sensor yet but it should be done by Wednesday night. I found out the A/F is a Bosch LSU 4.2 sensor. Can't do anything with the tune in the car at the moment because MPTune is not recognizing the com port again.