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2002 Toyota Tacoma Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Blue/Yellow
Car Radio Accessory Switched 12v+ Wire: Gray
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: Green
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 6 1/2′
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Pink
Left Front Speaker Negative Wire (-): Purple
Right Front Speaker Positive Wire (+): Green
Right Front Speaker Negative Wire (-): Blue
Car Audio Rear Speakers Size: 6 1/2′
Car Audio Rear Speakers Location: Rear Corners
Left Rear Speaker Positive Wire (+): Black
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Red
Right Rear Speaker Negative Wire (-): White
Replacing 2002 Tacoma PlugsIf you're talking about a 6 cylinder, then it's fairly straightforward. The driver side has normal-looking plug wires, the passenger side has the ignition coils covering the plugs. In either case, remove and label the wires from the plug side, unscrew and remove the ignition coils from the other side. Using a spark plug socket (this is important, the rubber ring in the socket will hold on to the plug, which is deep inside the head) unscrew the plug, make sure the new plugs are gapped and replace them. It is wise to use some rubber hose to start the new plugs so you don't cross thread. Then replace the plugs and ignition coils. It's probably worth replacing the plug wires at the same time.
Locate the spark plug cover on the engine.On some Toyota Tacoma engines, the cover is across the top of the engine. On others, it is along the side 4 cyl. Remove the cover to reveal the ignition coils and spark plugs wires. The spark plug wires are plugged directly into the engine and the ignition coils are in the tip of the spark plug wire. Remove the coil and wire from the spark plug. Twist and pull the plug out of the engine. Remove the spark plug from the cylinder well with a socket extender and socket wrench. Turn the wrench to the left to unscrew the spark plug from the engine. Discard the old spark plug and apply a coat of anti-seize compound to the threads of the new spark plug. Insert the new spark plug into the socket. Use the socket and extension to screw the spark plug into place. Return the ignition coils and spark plug wires to the engine and turn it to lock the plug in place. Repeat the entire the process with the remaining spark plugs. Replace the spark plug cover when all of the spark plugs are replaced. Good luck and hope this helps and The spark plug tension may range between 11 and 15 foot pounds, depending on the size of the spark plug. The correct tension is indicated on the spark plug's packaging.
you posibly have a misfire due to fauly ignition coils and spark plugs - vehicles are notorious for this maybe a leaking valve cover that leaks oil to spark plugs clean holes before removing spak plugs and check ignition coils ( remove boots) intake has to come of to replaced spark plugs.