Peugeot Forums banner

1 - 4 of 4 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter #1
Good afternoon. I have a peugeot 207 thp 150hp,2009 model. The car is from rebuild. I have 25% negative fuel trims. My timing is ok by the way. Does anyone know fm what this is happening?
 

·
Registered
Joined
·
92 Posts
Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, leaking injectors, defective O2 sensors, exhaust leaks/pinholes before the O2 sensor, coolant temp sensor problems, and base engine issues such as low compression and incorrect camshaft timing.

with probe connected, it should be ~0.5v (ft corrected)
after you disconnect probe, it should be much higher than 0.5V (ft uncorrected)
 

·
Moderator
Joined
·
6,303 Posts
Wrong values for Lambda THP uses a wide band sensor which changes current based of fuel ratio not voltage you to monitor with diagnostics to get an accurate reading
 

·
Registered
Joined
·
2 Posts
Discussion Starter #4
Could this problem happens fm a bad high pressure fuel pump or the fuel pump that is inside the fuel tank?
 
1 - 4 of 4 Posts
Top