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Old 07-14-2008, 11:25 AM   #1
G Langa
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Member#: 181396
Join Date: Jun 2008
Chapter/Region: Tri-State
Location: sepa
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2007 Accord

Default CEL, All 4 Cylinders Misfiring?

I went to start up the car yesterday and the engine was cold so I let it warm up. It usually does so around 1500rpm. When it got to 1000rpm it was chugging a bit so I revved it, not hard, once and it went down to about 500rpm and stayed there. Only thing was the CEL came on.

I get on the highway to go home and there is this strong smell... I couldn't tell if it was fuel or not coming in through the car everytime I moderately pushed the car to get on the highway.

I check the codes and it is P0301, P0302, P0303, and P0304 which is all 4 cylinders misfiring according to the code reader.

I had an 03 Lincoln LS V8 which was notorious for blown coils causing misfiring since the valve cover gasket would leak and let oil into the coil on plug wells. When even 1 cylinder had a misfire the CEL would flash (which I thought all OBDII cars do when there is a misfire) and it would buck like a bronco letting me know something was wrong everytime I gave it gas. The previous owner did install an Exedy Stage 1 clutch, resurfaced the flywheel and put a new pilot and throwout bearing in.


Wondering any possible causes and solutions. This happened right after I put a strut tower brace but I can't see that affecting it. The PO put a CAI on the car that draws air from the front of the wheel well but that has been on there for a while. I haven't checked if the filter element is clean though so should I check the MAF and ditch the CAI?

Any help is appreciated... I'm very new to this car.
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Last edited by G Langa; 07-14-2008 at 11:34 AM.
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Old 07-14-2008, 11:42 AM   #2
Haelan
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If you're smelling fuel when getting on it you might want to pull your plugs and check for discoloration. In the process you can see if one of your coilpacks popped loose.
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Old 07-14-2008, 11:45 AM   #3
G Langa
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I think it might be fuel but I can't tell for sure. Is there a write up or anything on how to check the plugs? What kind of discoloration am I looking for? I'm also going to check the MAF, what do I look for on that?
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Old 07-14-2008, 11:50 AM   #4
Haelan
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If the plugs are fouled you may see some carbon build-up on the spark tips. White usually denotes detonation.

MAF you can buy special MAF cleaner or use some rubbing alcohol with Q-tips and clean the metal areas. You may notice some soot or oily residue on it.

It also wouldn't hurt to throw the stock intake back on rather than the CAI and see if it improves the situation.
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Old 07-14-2008, 12:30 PM   #5
G Langa
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What about the injectors?

Should I reset the codes and see if they end up coming back?
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Old 07-14-2008, 01:27 PM   #6
Haelan
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You can check your fuel pressure--the possiblity of all 4 injectors going out is pretty slim. An injector can get stuck open, which would flood a cylinder. Again, pulling the plugs and checking the color will give you more insight. It would also cause the smell.

How many miles on the car? OEM copper plugs need to be changed at least every 60,000 miles.

And yes, do an ECU reset and see if the codes trigger again.
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Old 07-14-2008, 01:36 PM   #7
G Langa
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The car just rolled to 100,000 miles. The PO took care of the car but I'm not sure if the plugs were ever changed. I will check that and the MAF first then.

I just want to get this knocked out quick. I stupidly waited with the LS and destroyed the forward cats. It was under warranty though thank god.

Any writeup on how to remove the plugs and check them? I know little to nothing about where everything is on this car and how to check stuff. I searched on here so now I'm searching ScoobyMods on how to check them. If they are fouled, what should I replace them with? Brand,type.

Thanks for the help too man, appreciate it.
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Old 07-14-2008, 01:51 PM   #8
Haelan
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Quote:
Originally Posted by glanga View Post
The car just rolled to 100,000 miles. The PO took care of the car but I'm not sure if the plugs were ever changed. I will check that and the MAF first then.

I just want to get this knocked out quick. I stupidly waited with the LS and destroyed the forward cats. It was under warranty though thank god.

Any writeup on how to remove the plugs and check them? I know little to nothing about where everything is on this car and how to check stuff. I searched on here so now I'm searching ScoobyMods on how to check them. If they are fouled, what should I replace them with? Brand,type.

Thanks for the help too man, appreciate it.
You'll have to remove the stock intake airbox, windshield reservoir tank, and battery to get to all 4 plugs. I'm sure if you do some searching on here you'll find some technical how-to's.

Just use Subaru OEM coppers as replacements, or if someone else chimes in with something better I'm all ears.
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Old 07-14-2008, 02:05 PM   #9
G Langa
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2007 Accord

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Cool thanks. I found the write up on scooby mods so I'll do that and hopefully that's my problem.

Would they all just go bad at the same time like that though?
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Old 07-14-2008, 02:11 PM   #10
Haelan
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I've heard of one cylinder misfiring, but causing misfire codes on all 4. The cam shaft sensor expects to see a certain number of pulses from the shaft within a certain amount of time. With just one cylinder running very poorly it can affect the readings.

The other possiblity is the cam or crank sensor is on it's way out. I don't think that is the culprit though due to the fuel smells you're experiencing. More than likely is is just one cylinder being flooded with fuel due to stuck injector, bad plug, or loose coilpack.
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