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The Dreaded Lean Code


RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,290
Reaction score
8,290
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Yes
For exhaust you need a friend, with a glove :)
Start engine and open the hood
Have friend put their gloved hand over tail pipe and listen for a noise on bank 2 exhaust

The fan in the engine bay can be quite noisy, so...............
When engine is stone cold, loosen and remove fan belt from crank pulley
Start engine, you can only run the engine for 2 minutes this way, no water pump
So be quick about it
Do same test and listen


Vacuum leak
Get some soapy water in a spray bottle if engine is warm, or ether(quick start) if engine is cold
Remove air tube from intake
Put a glove on your hand
Start engine
Put your gloved had over intake opening to restrict air flow, so engine is barely running
Spray "the fluid" at bank 2 lower intake areas
You will hear a change in RPM if either fluid is sucked in


You have higher STFT on both banks, and you have EVAP codes, EVAP use engine vacuum to operate, and it pulls that vacuum from upper intake somewhere, you will need to find out where
EVAP may be why your fuel trims are a bit high if its pulling vacuum from bank 2 side.......................well there you go
May not be as well, lol
You mentioned it so just throwing that out there
 


Xjorgeypoox

Member
Joined
Jul 19, 2020
Messages
33
Reaction score
3
Points
8
Location
Southern california
Vehicle Year
1999
Make / Model
Ford ranger 3.0
Transmission
Manual
Yes
For exhaust you need a friend, with a glove :)
Start engine and open the hood
Have friend put their gloved hand over tail pipe and listen for a noise on bank 2 exhaust

The fan in the engine bay can be quite noisy, so...............
When engine is stone cold, loosen and remove fan belt from crank pulley
Start engine, you can only run the engine for 2 minutes this way, no water pump
So be quick about it
Do same test and listen


Vacuum leak
Get some soapy water in a spray bottle if engine is warm, or ether(quick start) if engine is cold
Remove air tube from intake
Put a glove on your hand
Start engine
Put your gloved had over intake opening to restrict air flow, so engine is barely running
Spray "the fluid" at bank 2 lower intake areas
You will hear a change in RPM if either fluid is sucked in


You have higher STFT on both banks, and you have EVAP codes, EVAP use engine vacuum to operate, and it pulls that vacuum from upper intake somewhere, you will need to find out where
EVAP may be why your fuel trims are a bit high if its pulling vacuum from bank 2 side.......................well there you go
May not be as well, lol
You mentioned it so just throwing that out there
Great, thanks!
Looks like I’ll be running some more tests!🙃
 

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