97 4runner 3.4 Missfire / Trans jump @ highway speed
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97 4runner 3.4 Missfire / Trans jump @ highway speed
Well I picked up a used 4runner with 130k miles on it. Its an extremely clean vehicle. Here is my issue and I believe I know the answer but I wanted to run it by everyone. It had a code for missfire on cylinder 5 when i got it. Well I went home and found single ground plugs so I got dual electrode plugs and moved cyl 5 coil to cyl 3. Now I am getting a missfire on cyl 3 which tells me its a problem with that coil pack right? Now while I am driving everything feels great other than around 55-58mph and 1700-1900 rpms. If you try to hold that speed it starts feeling like the tranny is hunting gears but I think its the missfire happening. Can anyone confirm this? I dont feel this sensation at any other speed or rpm. Thanks in advance.
Jason
Jason
#3
Glad you got it figured out. Normally that misfire at cruising speed in overdrive happens with old plugs and wires. Since you have changed the plugs I would have thought that problem would be gone. How old are the wires?
#5
Check the wires for a date on them. If they are originals they will have the date. If you don't see anything I would just replace them so you know they are new and good.
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