Question about 1998 Toyota 4Runner

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I have a 98 4runner with 300000 miles. It's been running excellent but day before yesterday it started sputtering like a tractor when driving and idoling. Service engine light blinks when in overdrive, and goes off when it shifts back down. It's reading misfire on #6 but coil pac didn't fix it and neither did injectors. Any suggestions?

Posted by Stacy Morris on

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2 Answers

James McAllister

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  • 5 Answers

First check the plugs. Pull the #6 plug and look at the electrode. If it's wet and/or dark (black) it's probably not firing correctly. What is the spark plug gap? Is the center electrode eroded (not flat on the end)? Swap in another plug and see if it makes any difference. How old are the plugs?

Second, check the wires. Did you replace the wire(s) when you changed the coil pack? They should be replaced periodically (I replace the wires on my '96 4Runner at about 100k miles). Check the wires with an ohmeter. Resistance should be around 16-17.5k ohms (depends on length).

FYI, each coil pack on your vehicle fires two spark plugs. The #6 spark plug is fired by the #3 cylinder coil pack, so if the coil pack were bad, most likely both the #3 and the #6 plugs would not fire.

Posted on Feb 15, 2015

  • 10 more comments 
  • Stacy Morris
    Stacy Morris Feb 15, 2015

    We replaced all plugs, put new coil pac for #3, and put a #6 injector. Still no luck. It smells strong of gas when u first crank it and puffs like a tractor runs.

  • James McAllister Feb 15, 2015

    Was any service performed on the vehicle immediatley before the problem started? Did you check or replace the plug wires?

  • James McAllister Feb 15, 2015

    Has the timing belt been replaced? How many miles ago?

  • James McAllister Feb 15, 2015

    It sounds like you had the trouble code read? What is the code number?

  • Stacy Morris
    Stacy Morris Feb 15, 2015

    No service performed recently, just added a quart of oil to it the night before. Haven't checked plug wires... hoped to not have to buy those... and not that I know of about timing belt.

  • Stacy Morris
    Stacy Morris Feb 15, 2015

    No service performed recently, just added a quart of oil to it the night before. Haven't checked plug wires... hoped to not have to buy those... and not that I know of about timing belt.

  • Stacy Morris
    Stacy Morris Feb 15, 2015

    Code read misfire on #6

  • James McAllister Feb 15, 2015

    Code 0306 could mean bad spark plug, bad coil pack, bad plug wire, bad injector, or bad oxygen sensor. You have already replaced the injector, plugs, and coil pack. I would test the spark plug wire(s) next. Timing belt and water pump should be replaced every 100k miles (but timing belt is probably not resonsible for a code 0306). Does it use oil? I am in Jacksonville, FL Where do you live?

  • James McAllister Feb 15, 2015

    A Denso spark plug wire set is about $40 on Amazon. Fairly easy to replace.

  • Stacy Morris
    Stacy Morris Feb 15, 2015

    On the way back with plug wires now... man I hope this fixes it!

  • James McAllister Feb 15, 2015

    Let us know how it goes.

  • Stacy Morris
    Stacy Morris Feb 15, 2015

    Plug wires it was!!!

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Randy Ohler

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  • Toyota Master
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Valves are bad. #6. Try this. start the engine, warm it up. Pull the plenum off the throttle body. Rev it up and pour water into the throttle. don't let it die. This cleans the valves and the tops of the pistons. If you don't have a bent or burnt valve, this will clear up the # 6 misfire. other wise replace the heads or engine.

Posted on Feb 15, 2015

  • stephen peirce Feb 15, 2015

    check the plug boots and wires for cracks + can be escaping to - engine ground causing the trouble code also a malfunctioning crankshaft sensor or camshaft sensor will throw off the timing and make the trucks engine shake like crazy if you never changed either of these components after 300,000 this could be it post back with progress and good luck! stephen

  • stephen peirce Feb 15, 2015

    out of gap plugs to will set a code

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5 Related Answers

Anonymous

  • 20 Answers

SOURCE: Flashing check engine light on 2003 audi A4

you should stop driven the vehicle and get it repaired, The engine light flashing mean the emission problem is doing damage to your convertors.

Posted on Sep 28, 2009

Molson02536

Harvey N Tawatao

  • 3854 Answers

SOURCE: Check engine light

A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.

The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors. 

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner. 

Posted on Jul 02, 2009

Anonymous

  • 4 Answers

SOURCE: overdrive contoll button is blinking on 200 f-350 7.2 powerstroke

It sound is if your ABS/Speed sensor is the culpret.  Try this fairly inexpensive repair before you bring it in for a Diagnostic, which can run anywhere from $89.95 & up.  Go to the local ford dealer in your area and ask them for the ABS Sensor in your rear axle differential. The base part number being 9E731. This part runs roughly for about $20.00+ and your own time to replace it. 

Posted on Mar 23, 2009

daves944

Dave C

  • 1050 Answers

SOURCE: I HAVE A 2005 KIA RIO THE CHECK ENGINE LIGHT CAME

Take it to another shop and have them do a compression check. If the compression is low, you have found the problem. If the compression is the same as the other cylinders, trade the fuel injector at that cylinder with another cylinder and see if the problem moves. If the problem moves (misfire code in different hole), the injector is bad. If the problem didn't move, and the compression is fine, then you have a vacuum leak on the intake runner to that cylinder, possibly the intake gasket. Print this and give it to your new mechanic.

Posted on Apr 19, 2011

Anonymous

  • 1 Answer

SOURCE: p0304 cylinder 4 misfire

2001 oldsmobile silhouette van misfire on cylinder 4

Posted on Apr 19, 2011

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