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1999 Acura Integra: Intake and Fuel System Upgrade A turbochcharged Integra gets a further horsepower injection with a modified intake manifold and fuel-system tweaks. From "Tricked Out" episode DTRK-409

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Remove Old Intake Manifold

First up, Andrew begins the high-flow air and fuel system upgrade by removing the old intake manifold. All that's needed for this part of the job is a set of standard shop tools.

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Steps:

• To begin, drain out the radiator coolant, disconnect the negative battery terminal, and remove the intake pipe.

• Next, pop off the canister purge plug (figure A).

• Before removing the air temperature sensor plug and a throttle position sensor plug (figure B), be sure to mark them. They are interchangeable, so make sure to identify them so you can return them to their correct location when you put everything back together.

  Figure A

  Figure B

  
  

• Remove the three air lines on top of the engine. The first runs to the fuel pressure regulator, then the crankcase ventilation line, and the fast idle or cold start valve vacuum line (figure C).

• The last vacuum line to come off is the one on the back of the intake manifold (figure D). It's for the brake booster.

  Figure D

  Figure D

  
  

• Next, remove the two coolant lines on the throttle body: the one that attaches to the idle air control monitor and the two coolant lines on the passenger side of the intake manifold (figure E). A few drops of coolant might leak out during this.

  Figure E

  Figure F

  
  

  Andrew removes the intake manifold.

• Disconnect and remove the fuel return line on the bottom of the fuel pressure regulator (figure F).

• Use a ratcheting wrench to get into the tight areas to remove the nuts and bolts from the intake manifold.

• Once they're out, carefully pry the old intake manifold off of the engine.

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