Question about 2002 Toyota Tacoma

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I changed my number 4 coil pack on 2002 toyota tacoma, also changed my spark plugs. This is what the diagnostic machine said to do. It still continues to miss on and off. What else could be the problem?

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I would check the injector the diagnostic machine can only read misfires and what cylinder its on not what causes them see if the #4 injector is getting power or if its clogged

Posted on Sep 28, 2010

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How to replace spark plugs on a 2008 Toyota Tacoma 4 cyl


Not a difficult job, but difficult to outline without photo/video aid.

Short list, using compressed air, blow out all of the junk that has collected under the intake muffler, then remove the muffler from the throttle body and airbox There are two large hoses, plus two small hoses, one on the rear (crankcase vent) and one in front. There is also a wire harness on the rear that needs to be separated.



Once removed, make sure the top of the cam cover is clean, unplug the wiring harness from the coil packs, remove the bolts (10mm socket), and pull the coil packs from the plugs. The rear plug is a bit of a pain because of the wiring harnesses, but you can carefully separate them and move them out of the way.



The Tacoma 2.7 uses Iridium plugs. Stick with the OEM Denso plugs, don\'t fall for the snake oil salesmen pushing 4 electrode or special "hot spark" designs.

Jun 07, 2014 | 2008 Toyota Tacoma

1 Answer

2002 toyota tacoma v6 4x4. I had a multipel misfire code and a misfire code on cyl 3&6. I changed the plugs and ignition coil for cyl 3&6. cleared the codes but still having problems with...


I was having the same problem changed plugs, plug wires, coil packs, cat converter and had injectors flushed....cost quite a bit and nothing fixed the problem. Over 1000.00 spent before changing the injectors and this fixed the problem perfect. My truck now runs like new and I hope to get another 185,000 miles out of it......have the injectors checked and use "seafoam"....good luck

Feb 11, 2011 | 2002 Toyota Tacoma

2 Answers

2002 ford f150 4.2l wiring diagram


The COIL PACK TOWERS are numbered : coil----3---4 pack---2---6 plug----1---5 ----------------------------------------------------------------- The engine cylinders / spark plugs are numbered : passenger side , front to rear , 1 , 2 , 3 -----drivers side , front to rear , 4 , 5 , 6 ------------------------------------------------------------------- The spark plug firing order is ( 1 -4 - 2 - 5 - 3 - 6 )

Apr 07, 2010 | 2004 Ford F150

1 Answer

#4 cylinder is misfiring in my 1997 toyota tacoma 4x4. Auto parts store put on machine and got this result. They say that it could be spark plug. Any Ideas. Looses power on mountain.


Possible causes for a misfire:
Spark plug
Spark plug wires
Weak or bad coil
Dirty or a bad fuel injector
Low compression in cylinder
This is a case of testing and process of elimination. Have them all tested to find out which one is the culprit. Change the plug and wire to a different cylinder, if the misfire happens in that cylinder, you'll know it's either the plug or the wire. Without doing any testing, it's hard to say what the cause is.

Feb 10, 2010 | 1997 Toyota Tacoma

1 Answer

How to change spark plug on 2002 toyota tocoma 4 cylinder 2.7 , cant locate them


you have to remove the four ignition coils from the top of the valve cover and the plugs are down a hole underneath..

Nov 29, 2009 | 2002 Toyota Tacoma

1 Answer

How do I get access to the spark plugs in my 2002 Toyota Tacoma? There is a air flow tube over two of the spark plugs and I can't figure out how to remove it.


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.

Oct 11, 2009 | 2002 Toyota Tacoma

2 Answers

How do I change my spark plugs on my 2002 toyota tacoma


On the V6 engine The drivers side plugs are easy although the passenger side will require you to remove the intake boot and the coil packs, easily done with a 10 mm socket and ratchet. Disconect the coil pack connectors by depressing the plastic clip and pulling them off one by one on the three coil packs . leave the plug wires attached and pull the coil pack straight up and off the spark plug.Blow out the area around the plug with compressed air to prevent debris from entering engine when the plugs are removed. Use a 5/8 spark plug socket and a 8 inch extension bar on your 3/8 ratchet at remove the plugs. use anti seize on the new plugs, gap the plugs to manufacturer specs and install your new plugs 2. If its a 4 cyl engine its actually a bit more difficult. The intake boot assembly has a bracket that bolts to the valve cover and side of the engine and you must remove it to access the 4 coil packs on top of the engine. once again the coil pack wires must be disconected and the coil packs un bolted and removed from the valve cover to access the plugs. Blow all dirt from around plug with compressed air to prevent foreign objects or dirt from entering the engine when you remove the spark plug , once again use a 3/8 ratchet and an extension with your 5/8 spark plug socket and remove plugs, use a small amount of anti seize compound on the threads of the nes plugs and gap them to manufacturer specs before installation. Also while the coil packs are off,, Inspect them for ARC Tracing a white residue and line may form on the coil pack Tip/boot if you see alot of ARC tracing Id suggest replacing that coil pack. Especially if you have a misfire condition.

Aug 20, 2009 | 2002 Toyota Tacoma

1 Answer

Cant find the spark plug location on 2002 4cyl tacoma


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.

Apr 19, 2009 | Toyota Tacoma Cars & Trucks

2 Answers

#4 cyl misfires/code 304


P-0304 indicates number 4 cylinder misfire. Are you using Toyota parts dept spark plugs? More often than not, non-toyota plugs make the v-6s run poor, right out of the box....
Try this:With the engine running, pull the connector wire off of the #4 injector. Note to see if there is any change with the idle quality. No change? You may have a bad injector.

Aug 12, 2008 | 1997 Toyota Tacoma

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