Author Topic: Mis-fire #3 Code: P0303 (Read 3605 times)

MiniSimp · « **on:** May 06, 2008, 07:25:09 AM »

I have a mis-fire on the #3 cylinder. 3.4L V6
I've changed the wires and plugs, what els could be causing it?

Tallchevy · « **Reply #1 on:** May 06, 2008, 08:04:12 AM »

What year is your 4Runner? Possible coil pack.

MiniSimp · « **Reply #2 on:** May 06, 2008, 08:06:58 AM »

Sorry, 2001

Tallchevy · « **Reply #3 on:** May 06, 2008, 08:13:26 AM »

Do you have any codes? If so, what are the code #'s if you have them?

MiniSimp · « **Reply #4 on:** May 06, 2008, 08:29:29 AM »

Quote from: Tallchevy350 on May 06, 2008, 08:13:26 AM

Do you have any codes? If so, what are the code #'s if you have them?

I don't have the code number, but our shop mechanic ran it through the OBD code reader and it came up with a misfire on the #3 cylinder with 2 previous misfires on the #3 cylinder stored.

MiniSimp · « **Reply #5 on:** May 06, 2008, 10:06:19 AM »

I'm going to try running some injector cleaner and see what happens.

Any recommendations for a good cleaner?

79coyotefrg · « **Reply #6 on:** May 06, 2008, 10:19:04 AM »

seafoam

Tallchevy · « **Reply #7 on:** May 06, 2008, 10:31:42 AM »

Did you change the fuel filter? Check the fuel pressure. I worked on a Ford Mustake the other day that had a fuel injector sensor thingy go bad & it gave a misfire on #1 & #3.

ROKTOY829 · « **Reply #8 on:** May 06, 2008, 10:35:51 AM »

Swap your coils and see if the miss changes cylinders. Chances are you got a coil going bad we've replaced a bunch of them for mis-fires.

Willy Mammoth · « **Reply #9 on:** May 06, 2008, 05:37:04 PM »

Quote from: ROKTOY829 on May 06, 2008, 10:35:51 AM

Swap your coils and see if the miss changes cylinders. Chances are you got a coil going bad we've replaced a bunch of them for mis-fires.

Cheesemaker · « **Reply #10 on:** May 06, 2008, 09:44:43 PM »

I had a miss fire on our van and it was the spark plug boot had a crack in it. New plug boots too~!

super22r · « **Reply #11 on:** May 06, 2008, 10:58:45 PM »

check injecter with volt meter/set it to ohm and measure the resistance and compare with other injecter

ROKTOY829 · « **Reply #12 on:** May 07, 2008, 08:08:38 AM »

Quote from: cheesemaker on May 06, 2008, 09:44:43 PM

I had a miss fire on our van and it was the spark plug boot had a crack in it. New plug boots too~!

if he has to replace the coil it will come as a unit with a new boot

MiniSimp · « **Reply #13 on:** May 07, 2008, 06:27:36 PM »

Ok so the code is P0303 Misfire #3 cylinder is all it says.
Since I've replace the spark plugs and coil/wires then I think I'm down to 2 possibilities:

1. The coil hooked up to the computer on the PS of the engine is bad, but then I would think that 2 of the cylinders would be misfiring...

2. The Injector on the #3 cylinder is bad, kinda makes more sense to me, but sounds like a PITA to change. Anybody know how much an injector costs?

Advice? Options? Ideas? Bacon?

79coyotefrg · « **Reply #14 on:** May 07, 2008, 06:58:10 PM »

i wish i could help ya Kyle but i have NO clue

crawlerdan · « **Reply #15 on:** May 07, 2008, 07:03:07 PM »

Quote from: ROKTOY829 on May 06, 2008, 10:35:51 AM

Swap your coils and see if the miss changes cylinders. Chances are you got a coil going bad we've replaced a bunch of them for mis-fires.

this is about the best suggesrtion ive seen, seafoam wont help, its not a clogged injector

toyota has codes for injectors, a misfire is seperate. it is actually as simple as it sounds-#3 is not firing

check coil packs, all wires going to coils, make sure that if you swap em around you remember wheich is which,
toyota also will flag misfire if compression is abnormally low in a cylender

crawlerdan · « **Reply #16 on:** May 07, 2008, 07:05:05 PM »

Quote from: MiniSimp on May 07, 2008, 06:27:36 PM

Ok so the code is P0303 Misfire #3 cylinder is all it says.
Since I've replace the spark plugs and coil/wires then I think I'm down to 2 possibilities:

1. The coil hooked up to the computer on the PS of the engine is bad, but then I would think that 2 of the cylinders would be misfiring...

2. The Injector on the #3 cylinder is bad, kinda makes more sense to me, but sounds like a PITA to change. Anybody know how much an injector costs?

Advice? Options? Ideas? Bacon?

yep-bacon

MiniSimp · « **Reply #17 on:** May 07, 2008, 07:06:16 PM »

Quote from: crawlerdan on May 07, 2008, 07:03:07 PM

this is about the best suggesrtion ive seen, seafoam wont help, its not a clogged injector

toyota has codes for injectors, a misfire is seperate. it is actually as simple as it sounds-#3 is not firing

check coil packs, all wires going to coils, make sure that if you swap em around you remember wheich is which,
toyota also will flag misfire if compression is abnormally low in a cylender

Thanks.

Tallchevy · « **Reply #18 on:** May 07, 2008, 09:02:33 PM »

Quote from: MiniSimp on May 07, 2008, 06:27:36 PM

Anybody know how much an injector costs?

An aftermarket injector is around $200.

Check the emmisions warranty from Toyota, maybe it's still covered

ROKTOY829 · « **Reply #19 on:** May 08, 2008, 07:45:28 AM »

Mini the injector is not as bad as it seems to change out. How did you realize the injector was bad? I suggest before you replace the injector go the local dealership i ask for a fuel injector service it is a pressurized can of cleaner you have to take the fuel pump loose and tie it into the line. It done wonders on my 3.4 but only problem is the tool to it is a dealer tool. Don't seem to sound like a jerk but are you sure you actually working on cyl. 3. I've seen alot guys get the cylinders mixed up.

MiniSimp · « **Reply #20 on:** May 08, 2008, 07:55:45 AM »

Quote from: ROKTOY829 on May 08, 2008, 07:45:28 AM

Mini the injector is not as bad as it seems to change out. How did you realize the injector was bad? I suggest before you replace the injector go the local dealership i ask for a fuel injector service it is a pressurized can of cleaner you have to take the fuel pump loose and tie it into the line. It done wonders on my 3.4 but only problem is the tool to it is a dealer tool. Don't seem to sound like a jerk but are you sure you actually working on cyl. 3. I've seen alot guys get the cylinders mixed up.

I'm not sure it is the injector.
I'm going to try switching the coils first and test that.
I'm not sure which is cyl. 3, but I've got a book or two that I'm sure will help me out.
I'm hoping to start on it Saturday morning.

ROKTOY829 · « **Reply #21 on:** May 08, 2008, 08:04:08 AM »

Cyl. 3 is the middle coil on passenger side. take a long screw driver and lay it on the injector and using your ear listen to it and compare it to the other injectors should hear it pulsing. if it is then it should be just clogged if it is the problem.

MiniSimp · « **Reply #22 on:** May 09, 2008, 07:22:49 PM »

Ok, so...I'm lost.

I switched my #3 coil with my #1 coil and now the thing runs like a raped ape!

The hope was that I would get a P0301 code (misfire #1) to determine that the coil was the problem. Now there is no problem, no stumbles, full throttle with a kick.

I'm so confused.

crawlerdan · « **Reply #23 on:** May 09, 2008, 08:04:29 PM »

reset the computer by pulling the groung off the battery for 5 mins at least.

drive for a few days under normal conditions, check again

Duffil · « **Reply #24 on:** May 09, 2008, 08:12:30 PM »

could have been a loose connection on that coil, causing misfire.

MiniSimp · « **Reply #25 on:** May 09, 2008, 08:45:07 PM »

Quote from: crawlerdan on May 09, 2008, 08:04:29 PM

reset the computer by pulling the groung off the battery for 5 mins at least.

drive for a few days under normal conditions, check again

Did that this afternoon.

Quote from: Duffil on May 09, 2008, 08:12:30 PM

could have been a loose connection on that coil, causing misfire.

Maybe

MiniSimp · « **Reply #26 on:** May 16, 2008, 06:12:10 AM »

I have good news!
got a mis-fire on the #1 cylinder!!!

So that means the coil is deffinetly the problem.

Duffil, give me a call.

ROKTOY829 · « **Reply #27 on:** May 16, 2008, 06:19:02 AM »

Cool beans nothing major it seems

Duffil · « **Reply #28 on:** May 16, 2008, 07:14:33 AM »

don't worry bro I still have it. We can grab it whenever.

MiniSimp · « **Reply #29 on:** May 16, 2008, 07:37:31 AM »

Quote from: Duffil on May 16, 2008, 07:14:33 AM

don't worry bro I still have it. We can grab it whenever.

Gimme a call from work when you get a chance, I'll pay for it now, pick it up at 6am tomorrow morning.

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