Question about 1997 Toyota 4Runner

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Engine missing mainly between 45 and 55 mph

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?

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  • Toyota Master
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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

michigan man
  • 3533 Answers

SOURCE: engine idles rough, misses at 2500-3000 rpm's

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

66 chrgr
  • 1011 Answers

SOURCE: when the engine is not cold, it idles at below 400 rpm and stops

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

  • 16 Answers

SOURCE: Engine misses badly at freeway speed.

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

plaztiksr4me
  • 154 Answers

SOURCE: Missing of engine in idle or parking when cold

not normal. bad spark plug wires they may be gapping or jumping spark. also maybe coil pack is doing same thing.

Posted on Apr 23, 2010

  • 85 Answers

SOURCE: Misfires. I have a 1998 Camry 2.2 with 200K miles. The

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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