Nissan has determined that on some 2004 model year Sentra and 2004-2005 model year Altima vehicles equipped with the 2.5 liter engine there is a possibility that power valve screws located in the intake manifold may become loose. If this occurs the Malfunction Indicator Lamp (MIL) may illuminate and unstable engine idling or power loss may occur.
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This inlet pipe kit may require the removal and reinstallation of emissions related components. If you are not familiar with the installation and/or the operation of these components then please refer this installation to a qualified professional.
Getting started
Make sure vehicle is parked on a level surface. Set parking brake. Disconnect negative battery terminal. If engine has run within the past two hours let it cool down.
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Additional Parts needed when you have a Dragon Filter, 1 x 3″-3″ Coupler / 2 x 3″ Clamp Remove bolts securing OEM air cleaner box, loosen clamps on OEM rubber intake pipe. Remove the coolant transfer / PCV hardline from from OEM intake and engine. Mark the coolant tranfer hose origins, install the 10mm hose supplied in kit to those 2 locations. Remove the OEM rubber intake tube, remove the OEM air cleaner box by pulling upwards. Wipe the throttlebody clean of any grease, install the 2.5″-3″ coupler onto throttlebody, secure with OEM clamp. Insert Weapon*R intake pipe into the 3″ end of the 2.5″-3″ coupler, secure with clamp. Measure the OEM PVC hose, replace with supplied 10mm (more…)

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Tools and Ease: Fairly easy ­ 30 minutes
Tools/Supplies: Screwdriver, high flash point solvent (kerosene), possibly new air filter
Step 1 Remove the left rear side cover.
Step 2 ­ Remove the five screws and retainer clip that secures the air cleaner housing cover. Remove the screw attached to the bracket that secures the air cleaner.
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The AEM intake system is a performance product that can be used safely during mild weather conditions. During harsh and inclement weather conditions, you must return your vehicle to stock OEM air box and intake tract configuration. Failure to follow these instructions will void your warranty.
1. Preparing Vehicle
a. Make sure vehicle is parked on level surface.
b. Set parking brake.
c. If engine has run in the past two hours, let it cool down.
d. Disconnect negative battery terminal.
e. Do not discard stock components after removal of the factory system.
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Components depicted here correspond to cylinder bank 1. They are different only as a mirror image of components for cylinder bank 2.
1 – Connecting hose On vehicles with engine code BWF To crankcase ventilation valve Ensure seated tightly
2 – Sealing sleeve On vehicles with engine code BWF Replace if damaged Ensure seated tightly
3 – Bracket On vehicles with engine code BWF For intake hose between air filter and intake manifold flap
4 – Acoustic cover For vehicles with engine code BWF
5 – Cylinder head cover On vehicles with engine code BWF Always clean sealing surfaces of cylinder head cover with a clean cloth before setting in place Replace seal together with cylinder head cover if damaged or leaking Observe tightening sequence of bolts
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The ‘I4′ DOHC engine first introduced in the Ford Sierra and Granada models of late 1989 was only available in the Sierra in 2.0-litre 8-valve form. While power output improvements can be made to the stock 2.0 8v engine, as documented in a separate article entitled ‘DOHC tuning’ and available from http://www.crustworld.co.uk/sierra/dohctuning.pdf, the engine output is ultimately limited by the availability and cost-effectiveness of off-the-shelf tuning parts.
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Engine, removing and installing Note: All cable ties opened or cut during engine removal must be reinstalled at the same locations. Remove engine without transmission toward the front. Drained coolant must be stored in a clean container for disposal or reuse. Always replace seals and gaskets. Do not open coolant circulation system.
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The evaporative emission system is designed to prevent the escape of fuel vapors from the fuel
system. Leaks in the system, even small ones, can allow fuel vapors to escape into the
atmosphere. Government regulations require onboard Testing to make sure that the evaporative
(EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks
and blockage. It also performs self-diagnostics. During self-diagnostics, the Powertrain Control
Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults.
If the first checks pass, the PCM then uses the LDP to seal the vent valve and pump air into the
system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace
the air that leaks out. The PCM determines the size of the leak based on how fast/long it must
pump the LDP as it tries to maintain pressure in the system.
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1. Disconnect the negative battery cable. Loosen the hose clamp on air cleaner box lid. Twist and remove breather hose from air cleaner box lid. 2. Unhook the two air cleaner lid latches on front of box. 3. Remove the air cleaner box lid by sliding it forward, and then up, and out of the factory intake tube. 4. Remove factory air filter from air cleaner box. 5. Remove, and set aside the oil filler cap. Use caution not to drop anything into engine while cap is off. 6. Carefully lift up on the engine cover (it is held in place by grommets, no bolts) to access the hose clamp (more…)

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