Question about 1997 Toyota 4Runner
I have a 97 4runner with the 4.3 litre. At first the engine started missing generally between 45 to 55 mph. After a couple of weeks it started missing throughout the whole rpm range, even at an idle. I changed the plugs and used contact grease of all connections. This solved the problem for about 800 miles. Now the engine is starting to miss between 45 and 55 mph again and I'm just waiting for it to turn back in to a full blown problem. Just not sure what it is. If it were a coil, timing, or wire problem wouldn't the issue be more of a constant?
I'm going to assume you have the 3.4 V6 engine which uses direct ignition with a coil on each plug.
Could be ignition or fuel related.
A weak spark/coil will allow the engine to run on all 6 cylinders at idle but miss under load, especially when going into overdrive at 45 mph. Not enough spark to jump the gap.
Same thing with low fuel pressure or dirty injectors. Not enough fuel when the engine is working hard.
Usually when you get a hard miss you will get a trouble code for the cylinder that is not giving power.
Have you changed the fuel filter in the past 12 months ?
Posted on Jan 22, 2013
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Posted on Jan 02, 2017
i would first check the timing and if that does not fit i would take the cover back off and look at the belt for a bad or missing tooth
Posted on Feb 14, 2009
have the throttle body cleaned it is restricting air flow from having to much carbon in the intake yes and also it is time for plugs and wires.
Posted on Mar 22, 2009
spark plugs? spark plug wires? coil? if it shuts off when hot, and starts when cold, coil could be problem....could be radiator stopped up causing it too heat, and will go off wait a few and it'll start back up...
Posted on Jun 20, 2009
Hi, my first recommendation would be to take the plugs out and visually inspect each one and check to make sure they are properly gapped, if they look fouled at all i would replace them without hesitation. try throwing a set of NGK plugs in the car to fix the misfires. other than that you may want to look at the wires. good luck joe
Posted on May 22, 2010
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