Accent LC (2000-05) :: After Every Fill Up CEL Code P0304 Came On
Aug 31, 2008
2004 Accent - auto. - 100K miles
CEL for code P0304. I thought I had it solved but now it comes on after every fuel fill-up. Its happened at least 5 times or more. I know what the code means (ign. misfire #4 cyl.).
I read and checked what affects the code but this one has me baffled. I thought at first it is the evap. canister but the car takes a fuel fill-up without any trouble and it is not hard to pump it all in and does not give me the code. If I put a bottle of STP gas treatment in the tank it clears the code after about 40 miles driving but it doesn't explain why it sets off the CEL on every fill-up. I also thought I may have sediment in the tank and the fill-up is stirring it up but I have filled her up and various capacities. Also, several weeks ago I got the CEL code P0441 for the purge control valve. I replaced it, cleared the CEL and it never came back on. Fuel filter has never been replaced because it is built into the fuel pump assembly.
Overall drivability and MPG's are not affected.
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Car - 2004 Accent auto.- 1.6l - 97K miles
After battling a few months to get my check engine light - fault code P0304 to go off I finally remedied the problem with 3 bottles/fill ups of STP Gas treatment. This was about 1500miles ago. I go to DMV Inspection station and sat for an hour then wait anther 20minutes for the test to end and was given the big fat rejection sticker, she failed because the check engine light came on with fault codes P0304 & P0441.
Now what the heck happened here? Just bad luck and coincidence or did their test set it off? Anyway the P0441 code is new and researched it is the Evaporative Emission Control System Purge Valve. Okay where is it, the HMA manual is not specific? In relation to the intake manifold where is it? Easy fix? And will this solve my P0304 code?
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My wife has a 2002 Accent with 117K miles on it. Fuel pump has never been replaced, but fuel filter and PCV valve changed about 5K miles ago.
The problem started when I added some BG44K fuel injector cleaner to the gas tank by way of a funnel. There was no discernable change in the car until my wife tried to fill up with gas...it kept clicking off. This has been going on for some time and it's pretty annoying.
So I do some research and learned that there could be charcoal pellets in the venting lines coming from the charcoal canister. I removed the charcoal canister from the car, and sure enough, there were a lot of little pellets in the hoses. I disconnected all the hoses and shook out all the pellets (not from the box, from the hoses) and connected everything back up. I went to the gas station and...nope, still clicking off every 2 seconds.
Then I removed the fuel filler neck from the car and inspected it. There were no restrictions in the main tube and no restrictions in the tube that runs up the main tube and loops back down the other side. [b]The blue/black check valve was a little clogged, so I blew it out with compressed air. I reinstalled it with the arrow pointing towards the charcoal box - meaning air and/or fuel can travel towards the canister only. Should the check valve be facing the other way? I assume it should, so gases can vent from the canister to the atmosphere - I don't want air/fuel going into the box, right?
I did find a restriction in one of the smaller hardlines that is connected to the fuel filler neck - it was more charcoal pellets. It was really clogged and I had a hard time removing them. At this point, there are no clogs, restrictions or charcoal pellets in any of the lines (including the charcoal canister), yet I still cannot properly fill the tank. Is the check valve now my only problem?
My wife told me today that the car "felt funny" and didn't "go when she stepped on the gas". Another symptom of the check valve?
I'm not entirely sure why adding fuel injector cleaner would have caused this problem.
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I recently bought a 00 Excursion v10 2wd everything looked right no major problems. I noticed it has a rough idle and i thought it could be the EGR i went under the hood and there's no EGR in sight. I plugged the OBD reader to see if it would give any codes since the there was no check engine light on and wanted wanted to make sure it worked, It showed a P0304 code its Cyl4 misfire i checked plugs/coils and i noticed there's a little insert inside Cyl4 plugs hole in the head that it has the plug screwed on. I decided to change all the plugs and the coils and i still have the rough idle and code i can hear a ticking noise around the engine in the passenger side.
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Hyundai Accent 2001. Not long after I bought it (from a cowboy, obviously) I filled up my petrol tank to full and as I was pulling out of the petrol station the car stalled and wouldn't start.
This keeps happening every time I fill it up, I can just barely drive it as long as I keep my revs up, but if I start to slow down (when approaching traffic lights etc) the car just stalls.
My check engine light is on but a mechanic just said that was because of a sensor and I don't need to worry about it, I'm not very good with cars so didn't really think much of it.
I can also smell petrol sometimes and when I unscrew my cap on my tank it sometimes hisses (is this normal after driving 30 minutes?)
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The other day my 2000 Echo started missing, she would run fine until after about 5 mins. After that, it would run like it was only running on two or 3 cylinders so I took her to Auto Zone for a code check--it came back with p1315,p0141 & p0304. On the way home it really got bad! She started dying on me. Just like u turned the key off. Before coming to a complete rest I turned the key all the way off and back on and she ran for 30 seconds or so - You would have to turn her all the way off--back 2 clicks--one click back would not work and this is the way I got her back home--about 7 miles turning her on and off. I wish now I had not hooked her up to there code checker because I think it burnt something out.
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Ok had a check engine light. It directed me to replace the IAT sensor.. After some research I found it was integrated into the MAP sensor. Purchased a new sensor and replaced. Drive about 15 miles CEL throws another code. P0106 (sensor i just replaced) faulty Map sensor.
Followed procedure to replace sensor.. unhook battery cable reset ecm. After reset engine is hard to start. Followed by RPM changes (assuming its the ECM re-adjusting). Then CEL flashes 5-6 times and goes out, Drive 15 miles. Map sensor code reappears. (note i only purchased one sensor But repeated install 2 times).
My thought is against wiring. since the codes refer to different signal wires one for IAT one for MAP sensor. Faulty replacement sensor?
2002 Accent 1.6L
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2006 Subaru Forester X 2.5L AT non-turbo
I changed the oil and oil filter; replaced the air filter (Fram), and replaced the alternator and a/c belts. I also got a full tank of gas at Sam's Club, I was nearly empty. I've gotten gas plenty of times there, before.
Next day, the CEL comes on. It's a P0304 code. (Cruise control light is flashing, too.) Engine stumbles and runs rough when cold; idles fine when warm, runs OK, but not the same, when warm. CEL is steady, which is "not bad" but I can make it flash if I hit the accelerator while the engine is cold. Resetting the computer by disconnecting the hot battery terminal didn't work; CEL came on again two days later and symptoms remained.
I buy some MAF cleaner (CRC) and use it; MAF was pretty dirty on the upstream side, actually.
I'm going to change the plugs and wires (they need it, anyway) and I've ordered a new ignition coil, which I'll also switch out.
I've also ordered the gasket for the throttle body, which I'll take apart and clean once that comes in. Last step is to order replacement O2 sensors.
I'm 99% certain there's nothing wrong with the engine, in terms of rings, valves, pistons, etc. I think I'm covering all the bases in addressing this myself. I'm on a limited budget so I'm doing all the labor myself and ordering non-OEM parts on-line, after researching to make sure the parts have a good reputations, fit, etc. (Yes, that's all a big FU to Subaru service for being over-priced but besides being relatively poor I also enjoy doing this stuff.)
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The code p0304 pop up last week, I have 50800 miles on my car, I unplug the spark plug and the ignition coil from the cylinder 4 and when i start the car I can there is a spark so the wire the spark plug and the ignition coil is good... I changed the fuel injecter with the one from cylinder 3 I cleared the code and it came back?
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I changed the coil on cylinder 4 on my 2004 V6 Tacoma and the p0304 code keeps coming back along with the hesitation and missing when I accelerate. The wires were replaced a month ago. What now?
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Have '01 SE. yesterday I got a misfire in cylinder 4 (code P0304) the service light blinked on and off 3 to 4 times than stayed solid. changed plugs and boots about 1 to 2 months ago, didn't change coils and they r not in the best shape but didn't have money to replace at time. So I replaced the coil for #4 and it still runs rough with code, plug has some ware but looks fine.
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I left my chevy s-10 truck sitting over the christmas (23/24/25) and it was really cold outside and when i got back i started getting a P0304 (Cylinder 4 Misfire). I replaced the spark plugs and spark plug wires. May be the cold would cause this to happen? I think I've noticed the trucks fuels efficiency drop over the past month). May be the fuel injector(s)? Is the s-10 TBI or does it have fuel injectors for each cylinder?
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We just bought a 2002 Camry with 72,000 miles 2 months ago. It now has 74,000 and while on vacation the CEL came on. I took it to a mechanic who got the code P-0304 off the computer. He swapped the number 4 ign. coil pack with the number 3 cylinder. The CEL light went off and I was able to drive the 300 miles home. The next day the CEL started again, but this time it's flashing. I changed the spark plug, it looked good, and still have the CEL on with the P-0304 code.
I've inspected the wiring to the number 4 ign. coil pack and it looks good. I'm thinking the next thing would be the fuel injector.
The car runs great, you'd never know by driving it that there is a misfire occurring. If it's not the wiring or fuel injector what should I check for next?
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2000 Jetta GL 2.0 AEG. I am receiving the P0304 which I have identified as Cylinder misfire #4. I read on some previous posts that I cannot be the distributor because if it was I would be receiving misfires on two cylinders. The spark plugs are OEM NGK and have been replaced recently.
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So, over the past day and a half my beloved B6 has been putting me through the wringer... Sunday morning I fire it up, drive to church, turn the car off and everything is fine. Church is over, I drive home, turn the car off and my cooling fan keeps running... I go inside and check again in about 15 minutes hoping it had shut off after 2 minutes or so, but nope, still running. So, in order not to kill my battery, I disconnect it. I let it sit for a few hours and went back out hoping that leaving the battery disconnected would reset something, but as soon as terminal touched the lug, the fan kicked on again.
Now, for the electrical issues that have come with this problem... Whenever I hook the battery back up, a few things can (and usually do) happen. The steering and traction assists don't work, the parking brake malfunctions, the transmission shifts HARD (if feels like somebody is rear-ending me), occasionally the transmission just stays in 3rd gear, and all of the PRNDS emblems in the dash readout are highlighted as if they're all in gear at the same time. Now, cut the car off and back on a few times and most of these issues go away, but other times I've got to fight it a while and disconnect/reconnect the battery for everything to fix itself. I popped my scanner on it, because it's throwing a CEL as well, and aside from the P0304 misfire code (stupid intake valve crud...), I'm occasionally getting P0864 - TCM Communication Circuit Range/Performance. Not sure what's going on, but it seems like my car is self-destructing...
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Well, I have a big problem on prius 3, the problem is that it has a big and I mean a big body shake when I decelerate above 30 mph or slowly accelerate above 30 to 50-70 mph, when I fully accelerate, the body shake disappears. When the body shake occurs MIL comes blinking and DTC P0304 comes but not always, but the shake is only when the coolant is hot.
On the other hand, if the MIL is not on with the tester it can be seen that the cylinder 4 has misfire margin, only cylinder 4, every time. Now what I have done is to exchange the injectors, problem remains on cyl4.
-replaced the coils, problem remains on cyl4,
-clean the EGR, problem remains on cyl4,
-opened the engine to see the valves, cylinders, pistons, exchanged the ring set,problem remains on cyl 4,
Replaced the wheels, the problem is still there, now I want to replace the drive shafts.
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My 2005 Mustang w/ 4.6L is giving a P0456 code and also won't let me fill it with gas completely. I think I've narrowed it down to the canister vent or purge valve. Looking for narrowing down which would cause the gas fill issue.
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Unfortunately I've neglected changing the spark plugs in a while. I've done so now with NGK iridiums. But still throwing the code. Thought it may be the ignition coil next. Swapped the current coils around to see if the code would change and no such luck. Erase the code and it still comes up as P0304.
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I was on my drive in to work Wednesday and the car once warmed up started surging and cutting out. I got it to work and home again and hooked up my code reader and came up with P0304 meaning misfire in number 4 cylinder.
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I know I can fix this problem, but my question is which cylinder is #4? I don't see it marked on the engine. The counter guys at both my local parts supply stores (whose initials are A and O) can't even look it up for me. If #4 is on the front of the engine, then it's an easy fix. If it's on the backside, then the intake manifold has to come off to get to the plugs and coil packs. It's a bit more labor. I can do it, but I'd rather not have to.
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My 2003 Silverado 5.3 has an intermittent CEL. I plugged in the reader and found code P0304, misfire #4 cylinder. I changed the coil, swapped the spark plug and wire from #2 cylinder to see if the code would follow. Nope, didn't follow. I swapped the injector also, same results. My daughter decided to borrow the truck and drove it so low on fuel that the low fuel light came on in the drive way. I added about 4 gallons of fuel and now the light went off. I started the engine after a jump start, and the engine really runs rough and now won't stay running. I am thinking that the fuel filter is probably needing changed because of how low the fuel.
I haven't checked the fuel pressure yet and will do that today. Now, what really puzzles me is the intermittent part. Sometimes it will run with no problem, but then the CEL will come on and the fun begins. The Chevrolet dealer says it's caused by the valves turning in the head and when it reaches a certain spot, it detects the misfiring #4 cylinder resulting in the CEL. If I pull in the driveway with the engine missing, go back out in a short time, start the engine and it runs fine. Same thing if it's running fine and I can start it and the CEL blinks and it begins missing, but may stop and run fine. I am stumped and not so sure about the turning valves.
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