Can i drop a 2004 nissan 2.3 in a 2003 nissan senra 1.8

You own a V4 version? You have a prototype version that was stolen from the factory R & D department!

The mid-size pickup concept for SEMA also gets a wider track, a cold air intake, a cat-back exhaust, and all sorts of NISMO visual add-ons. Nissan dropped the Titan's 400-hp, 5.6-liter V-8 into a Frontier pickup to create this concept for SEMA. The Frontier is only available with a 3.8-liter V-6 from the factory.

Perhaps you mean STRAIGHT 4?

• Fig. 2.4L Engine Firing order: 1-3-4-2 Distributorless ignition system
• Fig. 3.3L Engine Firing order: 1-2-3-4-5-6
• Fig. 2.4L Engines Firing order: 1-3-4-2 Distributor rotation: Counterclockwise
• Fig. 3.3L engines Firing order: 1-2-3-4-5-6 Distributor rotation: Counterclockwise
• Fig. 2.4L Engines Firing order: 1-3-4-2 Distributor rotation: Counterclockwise
• Fig. 3.3L engines Firing order: 1-2-3-4-5-6 Distributor rotation: Counterclockwise

https://www.google.com/search?q=2004+Nissan+Frontier+firing+order

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P1273 Nissan P1273 Nissan - Air Fuel Ratio Sensor 1 Lean Shift Monitoring Bank 1 Possible causes
- Faulty Air fuel ratio (A/F) sensor 1 Bank 1
- Faulty Air fuel ratio (A/F) sensor 1 heater Bank 1
- Fuel pressure
- Faulty Fuel injector
- Intake air leaks
- Faulty Air Flow Meter
Most probable is you have a bad heater in your upper bank 1 O2 sensor. Replace all of your O2 sensors.

Read more: http://engine-codes.com/p1273_nissan.html#ixzz3lgP7CTD8
Read more: http://engine-codes.com/p1273_nissan.html#ixzz3lgOwiMU8

Nissan never made a car called the "senra". That's probably why you are having issues.

Take it to some place like autozone and have them read the codes for free, that will tell you what the issue is.

bank 1 is the bank by the firewall. bank 2 is by the radiator.

Pcv hose on upper rear of intake manifold rotted through and causing a vacume leak. spray carb cleaner at mid rear of manifold and idle will drop and stall. pretty hard to replace but thats nasty nissan.

ON THE EXAHST

the nuts will be behind the carpeting in the trunk

Yes! If ya dont have a good spring compressor, and ya take the center nut out.. It'll kill you as the spring/shock separates.. My advice is to watch one being done before attempting.. Thanks

2004 Nissan Titan when using the kick down and the accelerator pedal is about 75% depressed the RMP go into the red zone then drop to about 25K and comes close to stalling. Why?