Auto Service

1. Open your hood and locate the air filter box and intake tube. Turbo models will feature a heftier intake that attaches to the turbocharger, while naturally aspirated engines have intake that attaches to only the throttle body.
2. Disconnect the electrical wiring, hoses and mass air flow meter that attach to the factory intake tube and set aside for use with the new intake system. Unfasten the hardware that holds the intake tube in place and remove slowly, careful not to spill any debris. If necessary, use a flat-head screwdriver to assist you in removing the intake tube.
3. Unscrew the bolts that hold the stock air filter box into place. Remove this factory intake box completely and dispose of it properly, as you will not need the filter or its housing box for the new install.
4. Check the new intake tube and count the number of holes that are drilled into the side. If there are more holes than hoses that attached to the old setup, plug the unnecessary holes with the grommets that came with your intake kit.
5. Attach the new intake tube to your A4 directly as the old one was removed. This part will mimic the old intake tube in design and functionality, while the filter itself will be positioned differently and provide better performance. Secure the intake tube with the silicone coupling that came with your cold air intake kit. There should also be a clamp ring that came with your kit to hold the silicone coupling and intake tube into place.
6. Attach the downward piece of the intake tubing system to the newly installed tube from Step 5. By this point, the intake tube should extend to the front of the engine bay and underneath the front of the car. The cold air will come in through the bottom of the front side of the vehicle, increasing horespower and fuel efficiency in your Audi A4.
7. Spray down the new air filter with the necessary lubricant before installing. Position the cone air filter that was provided in the cold air intake kit onto the downward intake tube. Tighten the clamp fitted around the cone filter to secure into place. Reconnect any remaining hoses and wiring that were removed at this time.

1. Look on the underside of the 328i’s hood and find the emissions label. Find the spark plug gap listed on the emissions label. Check the gap on all six new NGK BKR6EK, or equivalent spark plugs, with a spark plug gap tool. If the gap is not within the specifications listed on the emissions label, exchange the spark plugs for new ones, as they are not adjustable.
2. Unscrew the engine oil cap and pull upward on the passenger’s side of the engine cover -- the one that reads “BMW” -- to remove it, exposing the ignition coils below it.
3. Pull outward on the retaining tabs on a coil pack and pull the wiring harness from the coil pack. Remove the four coil pack-retaining nuts with a ratchet and socket. If the coil pack you are working on has a ground strap attached to its mounting stud, make note of the wire’s position and pull the ground wire off the mounting stud -- only one coil has this wire. Pull the coil upward with a slight twisting motion to remove it.
4. Remove the spark plug with a ratchet, 6-inch extension and spark plug socket. Remove the spark plug from the spark plug socket. Press a new spark plug into the spark plug socket until the rubber insert inside the spark plug socket holds it in place. Hand-thread the spark plug into the engine with a 6-inch extension and a 6-inch socket.
5. Torque the spark plug to between 15 to 22 foot-pounds with a torque wrench, 6-inch extension and spark plug socket.
6. Line up the boot on the bottom of the coil pack with the top of the spark plug. Press the coil pack downward until you feel it click onto the spark plug. Press the coil pack wiring harness into the receptacle on the coil pack until the locking tabs click into place.
7. If the coil pack you are reinstalling had the coil ground wire attached, slide the ground wire onto the coil’s mounting stud. Hand-tighten the four coil pack nuts, then tighten them with a ratchet and socket.
8. Repeat Steps 3 through 7 to replace the remaining five spark plugs.
9. Line up the pins on the underside of the engine cover with the rubber mounts on the top of the engine, and set the cover on top of the engine. Tighten the oil cap to secure the cover in place.

1. Open up the hood of your Mercedes. Look underneath the hood and locate the access panel for the emblem, which is positioned towards the front of the hood, by the grille. Locate the bar-shaped clips that hold the emblem in place, as well as the bar-shaped hole in the hood.
2. Insert the needle-nose pliers into the hole and use them to hold the bar-shaped clips together tightly, then twist the clip 90 degrees clockwise, until the bar-shaped clips fit through the access hole in the hood. Pull the remnants of the old emblem out of the hood, using your other hand.
3. Hold the replacement emblem on the hood, so that the clips are aligned with the slot in the hood. Push the clips in place until they go through the hole. Hold the hood emblem with one hand and turn the clips 90 degrees, until the access hole and clips form a "+" sign. Look at the top of the hood and verify that the emblem is straight. Close the hood of the car.