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99 4runner 3.4 misfire

Today i changed back to original plug wires and switched coil pack 1 to 3....i cleared all codes drove to the store with scan tool hooked up...ran fine to store no codes... when i came out and started it, i noticed it was stumbling again, it tru only one code this time po302.original code...i believe the wires i put in were bad or, i mixed up cylinders..i think this because i have the original code i started with before changing wires.po302...could it still be the coil pack as to it is showing a code for only one cylinder and the coil connects 2-5 cylinder? im at a lose at the moment and back at ground zero....any advice would be great...thanks

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SOURCE: 99 4runner po302 code

Yes. No clicking indicates a bad injector; you mentioned you had a Noid light; does it pulse?

If you remove the plenum to replace the injector, buy new plenum gaskets. You should not reuse them.

The graciousness of a FixYa rating for my assistance would be appreciated.

Posted on Jan 02, 2009

modelgirl
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SOURCE: 99 4runner 3.4

Ok this is sort of where I started with same problem, which at moment is not solved. You are on the right track as I also just changed my wires, although the readings from wires were ok, We also tried the coil & igniter which is simple to put in as connected by plug ins, I will warn you as I went to a Toyota parts yard $50. and they made the mistake of cutting one of the wires, to which my mechanic had to weld it together. It is held on by two bolts and plug ins so there is no need to cut! I was not getting power to cylinder 2. Thats when I can tell you that my back yard mechanic put in the injector, just to give you an indication in Vancouver, Canada it was $75. then 1hr to put in. It is a little tricky to install, and watch out for the vacuum hose for the fuel regulater as my mechanic didn't tighten it and it came loose! I have gone through a succession of things, latest being A new Coolant Temp Sensor which sends signals to fuel compression etc. It's tempermental in missing and running ruff. I am on here to try and get solutions before I take it to Toyota....arg

Posted on Jan 17, 2009

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Jeep grand cherokee crankshaft position sensor replaced but still given a weak spark


the coil. ? older post.
the PCM reports even one drop out of 10 , on the CKP or CMP sensors. 99.9% of these changed are good.
why not tell me what you have,? full symptoms and evidence.
got P030x misfiring? are you even using a scan tool,? or working blind.
may be its the coil.?
can can you feel the misfiring.c
can you see the engine shake? all of this is evidence.
do not miss out on that.
does the scan too shop pending misfire codes?
stored codes, or codes while driving, learn to use the scan tool.
do a 60k mile tune up yet?
your engine is not COP coils like the V8
its COIL rail that is a COIL pack with 3 coils inside
that runs 2 sparks each called WASTED park.
so did you try new sparkplugs(dah)first then new coil pack wires HV
next , then a new coil pack last.
start with the cheap spark plug and wires, (called a tuneup)
then pop for coil pack./
misfire can be clogged or leaking injectors too, and that ill skip
with out you using the scan tool fully.

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Description:
Cylinder 3 - Misfire Detected
Possible Cause:
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Ignition system. (Spark plugs gaps)
Fuel injector No. 3.
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1 Answer

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1 Answer

Car runs rough when warm an accelerator is applied normal


P0306 is a misfire on cylinder number 6. The fact that you have oil on those plugs may or may not be causing it. The oil on the plugs is because of a leaking "internal" valve cover gasket. First thing I'd do is change the valve cover gaskets. Audi will murder you if you want them to do it (I've heard of people quoted $700 or more for this job). It's VERY easy to do. You can order the gaskets from www.ecstuning.com or www.purems.com for about $25 per side. I'd change them for sure, as they're a known issue on these cars.

Now, if your new plugs and changing the gaskets (and cleaning up of course) doesn't fix the misfire, you need to swap coil packs around and see where the code goes. The coil packs are the three parallel items on the top front center of the engine under the beauty cover. Trace the #6 wire back to see which coil pack it goes to. Then swap that pack with another pack, clear the codes, and fire up the car. See if the check engine light comes back and if so, scan the car to see what codes come up. If you still get P0306, then the failure didn't move, and the coil pack is not the issue (in your case, it's likely to be the wire, since you have new plugs and swapping coils didn't work). If the misfire moved to a different cylinder (one which is now hooked up to the coil pack that was originally firing the #6 cylinder) then that coil pack is bad and must be replaced (another known issue on the A4).

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2 Answers

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Hello I need a help.
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1 Answer

99 4runner 3.4


Ok this is sort of where I started with same problem, which at moment is not solved. You are on the right track as I also just changed my wires, although the readings from wires were ok, We also tried the coil & igniter which is simple to put in as connected by plug ins, I will warn you as I went to a Toyota parts yard $50. and they made the mistake of cutting one of the wires, to which my mechanic had to weld it together. It is held on by two bolts and plug ins so there is no need to cut! I was not getting power to cylinder 2. Thats when I can tell you that my back yard mechanic put in the injector, just to give you an indication in Vancouver, Canada it was $75. then 1hr to put in. It is a little tricky to install, and watch out for the vacuum hose for the fuel regulater as my mechanic didn't tighten it and it came loose! I have gone through a succession of things, latest being A new Coolant Temp Sensor which sends signals to fuel compression etc. It's tempermental in missing and running ruff. I am on here to try and get solutions before I take it to Toyota....arg

Dec 28, 2008 | 1999 Toyota 4Runner

1 Answer

99 4runner po302 code


Yes. No clicking indicates a bad injector; you mentioned you had a Noid light; does it pulse?

If you remove the plenum to replace the injector, buy new plenum gaskets. You should not reuse them.

The graciousness of a FixYa rating for my assistance would be appreciated.

Dec 28, 2008 | 2001 Toyota Tacoma

1 Answer

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