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2003 jaguar x type: PO171..too lean..I replaced the fuel filter…

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I have a 2003 jaguar...
I have a 2003 jaguar x type with a 3.0 motor. It came in with codes PO171 and PO174 banks 1 and 2 too lean. I replaced the fuel filter. it was almost plugged. cleared codes, car came back with same codes. In the mornings it runs very bad. stumbles like it running out of gas. any ideas?
Submitted: 11 years ago.Category: Jaguar
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Answered in 5 minutes by:
11/12/2010
Jaguar Mechanic: Richard, Jaguar Technician replied 11 years ago
Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 16,762
Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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Richard :

Hello and welcome back to justanswer.com

Richard :

The most likely cause of your problem is a vacuum leak.

Richard :

Start the engine and listen for a hissing noise while idling when the engine is cold. The PCV hose sometimes will split and the IMT valves sometimes leak. This will cause vacuum leaks which will turn on that light. The PCV hose goes from the valve to the intake and the IMT valves are the electronic valves located on the passenger side of the intake manifold. I also see issues with the booster hose from the brake booster to the intake.

Customer:

Will that make it seem like your running out of gas? it will also do this a couple times a day after it is warm

Richard :

Yes it will cause the engine to run very rough and in some cases stall. It will still effect performance even when warm.

Customer:

checking it out now thank you. Be back stortly.

Richard :

OK let me know.

Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 16,762
Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
Verified
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Richard
Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 16,762
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Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.

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