Quote:
Originally Posted by matt0106
I had a 98 4runner 3.4l and now i have a 01 tacoma with a 3.4l that is having a misfiring issue. came back to T4R because I think this is the best site for solving problems.
Started out by pulling away from a gas station and running rough. checked codes and they were p0300, p0301, p0302, p0303. replaced spark plugs, wires, and coils and started it back up to come across codes p0300, p0304, p0305, p0306. with it practically running the same (rough and stuttering under load and at idle). then replaced fuel filter and also no change.
Does anyone have any idea of what the problem may be? Injectors? any advise for diagnosing this issue would be greatly appreciated!
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there are already ongoing threads so try googling '3rd gen 4runner misfire' etc.
Based on my readings and my experience (as I am experiencing this now), the consensus is get compression test to rule out the more serious blown head gasket.
For myself, I put in new wires and new spark plugs and I replaced one of the ignition coils recently.
Also, I did the spray to tb seafoam and it helped, but not completely fixed. My guess is that seafoam cleaned valves slightly. I am doing to do a second can and if the second seafoam doesn't work, then I will be switching out all six injectors (just so I don't have to do others again).
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