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04-29-2009, 10:11 PM | #1 |
Drives: Scion FRS Join Date: Aug 2006
Location: Arizona
Posts: 179
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Got engine check light :(
P0304 is the code that says misfire...
So I'm going to try and swap out the spark plug, but which one is cylinder 4? on the very left? |
04-29-2009, 10:13 PM | #2 | |
Start another Oil Thread!
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how many miles, and what mods? if you need a new coilpack i have them
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04-29-2009, 11:10 PM | #3 |
Drives: Scion FRS Join Date: Aug 2006
Location: Arizona
Posts: 179
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40k AEM Intake..
I don't need to change all 4 do I? D: |
04-29-2009, 11:44 PM | #4 | |
Start another Oil Thread!
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clear the code, see if it comes back. do that before you spend any $$
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04-30-2009, 12:13 AM | #5 |
What?
Drives: 2007 Yaris LB Join Date: Nov 2008
Location: Safety Harbor, FL
Posts: 1,006
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Mine was tripping misfire codes at high RPM last time I was at Sebring. Replaced all four plugs with good ol' NGK V-Power plugs and never looked back.
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04-30-2009, 01:40 AM | #6 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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List what mods you have. If you have a missfire and your car is running okay at the moment is intermitent and could be a high rpm miss like loren says. You only need to worry if the car starts running rough and you have a blinking check engine light. Meaning its missfiring bad enough to damage the cat and possibly 02 sensors.
I would try clearning the code first. And see what happens. The number 1 cylinder is closest to the cam and crank i belive and 4 is furthest away. either way just swap the far left and far right. Then clear code. If it says cylinder 1 is missfiring now then you know you have a coil problem. If it still says cylinder 4 missfire then you ahve either a spark plug problem, fuel problem, or mechanical problem such as low compression. If you hav ebeen consistantly running a low quality IE non toptier gas. (toptiergas.com) I would suggest running fuel system cleaner and removing plugs and spraying them down with carb cleaner to remove all the carbon buildup.
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04-30-2009, 02:33 AM | #7 |
Drives: Scion FRS Join Date: Aug 2006
Location: Arizona
Posts: 179
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ah i'll go give that a shot....
do I just reset ECU to clear code? and if so, which fuse do I pull again :< |
04-30-2009, 03:05 AM | #8 |
The Hated One
Drives: 07 White Manual Sedan Join Date: Sep 2006
Location: Oregon,USA
Posts: 390
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what do the plugs look like? if you swap the plugs and the misfire shows up on #4, if you have a digial camera, take a pic. I am curious to see what the gap is like and the condition of your spark plugs.
P.S. on most cars, pulling the nagative battery terminal off for a few minutes or more will reset the computer...no point in resetting it tho for the first test...if the spark plugs to blame you will get a #4 misfire when you swap the plugs around...and you will just have to reset the computer again.
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05-08-2009, 03:24 AM | #9 |
Drives: Scion FRS Join Date: Aug 2006
Location: Arizona
Posts: 179
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it's been a few days and light hasn't came back on...
does it mean it just slipped up once or something? |
05-08-2009, 11:30 AM | #10 |
Drives: 2008 yaris, stripped, red Join Date: Jan 2009
Location: SE Texas
Posts: 977
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pulling the bat is a bad idea for resetting ecu. the thing has to re-learn your driving habits and fuel economy programming n stuff...you can get a cheap handheld scanner for less than 20 bux now at autozone that will give only code numbers and ability to erase codes......
or, if you're seriously a cheapass you can go to autozone and talk them into deleting codes...they're not suposed to but they will with a little convincing |
07-01-2009, 06:27 AM | #11 |
ONE LOVE...YARiS LOVE!!!
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ok guys..my light has came on...
i currently have a weapon r dragon sri and recently installed an lpx performance muffler. ive had the intake for a while now...no problems. i've had the muffler installed 2 weeks now...any idea why it went on? i m at 16k is it that time to bring her in for service? i would just hate to bring her in if its something that could be done by deleting the code.... |
07-01-2009, 07:36 AM | #12 |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
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Read the post directly above yours. If you can afford a performance muffler, you can afford a code reader. You need to know what the code is when the CEL comes on. And the code reader will clear codes.
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07-01-2009, 08:42 AM | #13 |
ONE LOVE...YARiS LOVE!!!
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thanks mr. pimpin yaris =] my brother has one and he'll check it tomorrow...crossing fingers that it's nothing serious... =/
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07-01-2009, 11:10 AM | #14 |
Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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really just take it to the dealer this is a warrenty item
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07-01-2009, 09:16 PM | #15 |
ONE LOVE...YARiS LOVE!!!
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well see i would take it to the dealer...but theres only one toyota dealer here on guam and if i do turn it in to them they might need it the whole day...and this is my only daily driver...but if the code comes out to be a bad thing..then yes i without choice i will take it to the dealer... =[
thanks for the replies! =] |
07-01-2009, 10:09 PM | #16 |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
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Having a brother with a code reader's a good thing.
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