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Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 15508
Experience:  12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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We have a 2008 Rover LR3 vin# SALAE25458A458287..53K miles,

Customer Question

We have a 2008 Rover LR3 vin# ***** miles, We keep getting codes p0171 and p0174 system to lean. Runs fine, No missfires, No other codes, We had another truck here to swap parts from and, changed out MAF sensor, Fuel Pump, Fuel PSI = 65. We smoke tested, changed all intake gaskets and still have damn codes !! Whats strange is that before we even start KOEO, the car the LTFT long term fuel trim is at 16/17.. STFT is 0...Which I would consider normal. Any known gremlins for this ? Any reasons why LTFT is so high ? Thx Joe
Submitted: 9 months ago.
Category: Jaguar
Expert:  Richard replied 9 months ago.

We may have injector problems. Make sure we do not have any other air leaks like a cracked or damaged air intake tube. Then disconnect the negative battery terminal cable for about thirty minutes. Reconnect it and see if the long term fuel trims reset back to zero. If so then see what the short term trims are reading at idle after start up. Also make sure we donot have a crank case leak as a leaking PCV or oil filler neck can cause this. Let me know.

Customer: replied 9 months ago.

All Good ?? Did a injector power balance test as well, seems fine ??

Expert:  Richard replied 9 months ago.

What do are fuel trims read after disconnecting the battery?

Customer: replied 9 months ago.

No Change ??

Expert:  Richard replied 9 months ago.

Do they reset to 0 after the battery is disconnected and the ignition is turned on?

Customer: replied 9 months ago.

No, This is Messed up.

STFT running 9-12 Cold, -1.0 to + .5 Hot, LTFT 19-20 Cold, 17-18 Hot, Injector Duration 2.0 MS Manifold absolute PSI 5...