Question about 1998 Toyota 4Runner
#2 cylender misfire 3.4 v6 replaced plugs, wires, feul filter: no diference. has good spark. switched #2 injector with the one directly next to it. no diference. switched coil pack with the one next to it. no diference. checked timing belt, looks good, timing marks all line up nice. has 150 psi in all cylenders. am stumped at this point ........
You might want to look for a vacuum leak on the intake manifold. You also might need to hook up a scope and measure injector duty cycle and compare it with a good cylinder. Also check wiring for chaffing going to the injectors and coil pack. I can provide you with pin out on ECM if you need.
Posted on Oct 22, 2012
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Posted on Jan 02, 2017
SOURCE: 99 4runner 5vz-fe 3.4 misfire
I know this post is old, but right on the engine theres a sticker that says use multi-ground plugs only. I read a similar problem like yours and it seemed to turn out that the spark was arcing to ground over the ceramic on the plug. So maybe it could have something to do with the single ground plugs.
Posted on Jan 23, 2009
Most likely I a would suspect the fuel rail had moisture in it. If you checked emissions it would most likely show no HC and alot of 02 and no CO. If it does show alot of HC then I would suspect sticking valves intermittantly . The pinging really points to no fuel issue tho. If you pull the injector connector off and no change then I would remove the fuel rail and inspect. Also make sure the wires are in the correct locations. It easy to get them wrong.
Posted on Sep 03, 2009
the firing order is in fact 1 2 3 4 5 6 the number one cylynder is on the left at the back, as you look at the engine from the front >>
positions of cylinders
1 3 5
2 4 6
Posted on Mar 15, 2010
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