Montana :: 2002 - Code P0304 / Misfire - Flashing Light Now Solid
2002 Montana code P0304 light was flashing now solid, swapped coils no change, new plug and wire no change, found air box plugged solid from hibernating mice cleaned out thats when light went from flashing to solid still misefire. I've been told its the injector.
View 3 RepliesCamry :: 2005 LE - Misfire When Idling And Trying To Accelerate Hard / P0304 Code
We recently bought a used 2005 Camry LE 4cyl 2.4L. When we test drove it there were hardly any symptoms and no CEL. After driving it for a week we start feeling a stuttering every once in a while, no CEL still so I thought it might just need a tune up.
Replaced the plugs (which were in bad shape, were Iridiums, friend mentioned it seemed like they were burnt, white blistering like high RPM burn) with new NGK Platinums and replaced the air filter (was also in bad shape, was K&N that was badly clogged up and black).
Drove it around, let it idle, turn on AC, no problem not a hiccup. Next day arrives and the car is misfiring worse than before. CEL comes on too. We get the codes and its the P0304 I mention in the title.
We check the coils and the plugs and they fire, we switch coil 4 and 1 and clear the CEL, then later the CEL comes back on and it's still P0304 so we rule out the coils. The plugs come pre-gapped also.
The misfires are at their worst when idling and trying to accelerate hard, I can hold it at 2000-3000 RPMs with no hiccups or very few ones. Misfires worse with AC on.
Only thing left to do is check compression, try to clean the injector with fuel additive and premium gasoline, or replace the injector, at least that's what I think.
It has 86000 miles.
Camry :: 2002 - Code P0304 Coming Up After Swapping Coils
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.
View 5 RepliesIntrepid :: 2001 SE - Misfire In Cylinder 4 (Code P0304)
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.
View 1 RepliesS-10 :: 98 Chevy ODB Error Code P0304 / Cylinder 4 Misfire
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?
View 8 RepliesGolf IV / Jetta IV :: Code P0304 On Mk4 2.0 AEG - Misfire On Cylinder 4
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.
View 2 RepliesPrius (2010-12) :: Code P0304 Misfire On Cylinder 4
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.
Ford - Escape :: 2001 - Misfire On Cylinder 4 / P0304 Code
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.
View 1 RepliesSilverado :: 2003 - Intermittent CEL Code P0304 / Misfire On Cylinder 4
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.
Ford Ranger / B-Series :: 2008 - CEL Code P0304 / Misfire
2008 Ranger 3.0L. I am trying to figure my next step in diagnosing a #4 misfire. At regular speeds I really dont hear it or feel it, mostly at idle warm or cold. 3.0L with 275,000 kilometers on it , reg oil changes.The CEL is on, but not blinking. Pulled a p0304 code. I then changed out the bosch plugs I had in with ford plugs and wires. The #4 plug looked okay just bigger gap. Still got the code.
I hooked up a sparkplug light to the coilpack and did not see any missing flashes . Changed fuel filter, checked fuel pressure,all within specs. Changed the oil and did not see anything in it. I read that it could be an injector but I have to remove the intake manifold to get at it. I also read to check compression. I figured if I have to take off the manifold I would put a new injector in, instead of switching them around. What is the most common cause for this code?
Grand Prix :: 1997 - Code P0304 - Misfire Only On Cylinder 4 Frequently
1997 Grand Prix 3.8 N/A 181,000 ... I have been getting a misfire only on cylinder 4 which has become more frequent. It "only" happens after the car has warmed up and I turn it off for a few minutes, for instance going in to pay for gas. When I start, it immediately starts to miss but as soon as I hit the accelerator it evens out and runs great, every time. I replaced plugs and wires two years ago with stock.
Upper and lower intake manifold gaskets were replaced around 110,000. All three coil packs have been replaced with original GM packs. I replaced my EGR valve last year due to the original was sticking. My throttle body was cleaned about four years ago. I've seafoamed through brake booster and the rest in gas tank.
I'm stumped that it corrects itself right away by giving it gas. The SES light always come on but goes off on it's own after a few cycles.
Chrysler - Ptcruiser :: P0304 Error Code - Cylinder Number Four Misfire
2006 PT Cruiser Touring Ed. The engine light came on 2 days ago, had it looked at today and the error code p0304 "cylinder number four misfire" was diagnosed. What causes that and what would need to be done to fix that problem?
View 9 RepliesFord/Mustang :: 1997 - Getting Error Code P0304 / Cylinder 4 Misfire
1997 Ford Mustang 4.6L EFI engine with 67K miles. The engine is actually now in a Factory Five Roadster. It sat on a stand for 5 years but runs well now with the exception of the code. I keep getting a code P0304 (cylinder 4 misfire) and I've checked the plug - the code seems accurate; it is misfiring.
Things I've tried:
1)swapped plugs,
2)this is a dual coil engine so I've swapped coils,
3)the #4 plug is the longest sparkplug wire so I've gotten high-performance wires,
4)heavily grounded the AL head,
5)put dielectric grease on the plug,
Still, ONLY cylinder 4 gives the misfire.
Nissan - Sentra :: Check Engine Light Came On With P0304 Cylinder 4 Misfire Code
(This is a continuation of a previous thread: [URL] ..... )
I have a 2005 Nissan Sentra with 75,000 miles on it. Several months ago (see above link) the check engine light came on with a P0304 cylinder 4 misfire code. The only symptom appears to be a rough idle/shaking every 3rd or 4th start for the first 10-15 seconds, but runs smoothly afterwards. My mechanic replaced all my spark plugs (I had new plugs put it at 50,000 miles for the same issue) of which the one from cylinder 4 was worn down much more than the rest. The problem persisted so they replaced my fuel pump and fuel filter and switched the spark coils from cylinder 4 to a different cylinder, but the code still read cylinder 4 so it wasn't the coil. That was back in October.
I took my car back in last week for the same problem and without starting my car (because the problem is worst on the first start) they pushed my car into the bay and did a smoke test, no leaks in the fuel lines. Then they checked the cylinder and said that there was "excess" fuel in the cylinder and replaced the fuel injector. Then after ~3 days the check engine came back on with the same P0304 misfire code. Previous repairs/diagnostics rule out spark plugs, coils, fuel pressure, and injectors.
Ford Excursion :: 2000 V10 - Rough Idle - P0304 Code / Cylinder 4 Misfire
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.
View 7 RepliesFord Excursion :: Code P0304 Cylinder 4 Misfire - Broken Rocker Mount
6.0 .... Have a code Po3o4 Cyl 4 misfire. I pulled the valve cover to remove the injector and found the right half of the rocker mount and rocker arm laying in the head. What may have happened?
View 5 RepliesCamry :: 2002 - Intermittent Misfire Code P0300 / 301 And 302
I've got the intermittent misfire codes on my '02 Camry, and after changing the spark plugs and the ignition coils the problem still persists.
At first there was no noticeable misfire, I took it to two different mechanics and neither said they could find anything wrong. A few weeks later the misfire became noticeable when I'm sitting at a stop light. I can feel an occasional rumble in the engine.
Prius (2001-03) :: Cylinder Misfire P0300 - Error Has Been Occurring Almost Daily
General misfire when the engine light comes on. This error has been occurring almost daily, sometimes it pins it down to cylinder 3. My wife's nephew who is a mechanic says it could be the sensor, but I have only been getting around 30 mpg though the car seems to run alright. I did go ahead and get the plugs replaced, as I was told it could be a bad plug but the error light still comes on as before and the mileage appears no better. What could this be? I am retired on fixed income and dread the very idea of an expensive diagnostic & repair session with a dealer service. Their solution for about everything wrong has been to replace the gas tank (three times already in the life of the car). Last time that did not fix what was going on with the car..
View 10 RepliesFord - Windstar :: 2001 Misfire Occurring - Blinking Check Engine Light While Trying To Accelerate
I have a 2001 Ford Windstar Sports SE with 155K miles. I did a tune-up eight months ago. With the tune up I had to replace the fuel pump because it was defective. Later, I found that there were misfires occurring since I was getting slow acceleration. I had the spark plugs on the guilty cylinders replaced again and the spark plug wires.
Periodically, I have had to return to the shop to have the vehicle checked. I sometimes get a blinking check engine light while trying to accelerate, which now occurs only while it is raining or I am exiting the car wash. The shop is at a loss as to what it is (spark plugs and wires are fine, no lose connections noticed). I am wondering if I should take it to someone else. Of course, taking it somewhere else will cost me $100 to check on someone's else work.
The shop replaced the ignition coil. Distributor cap is fine. They keep saying that the engine is running fine while in the shop and do not get any codes. I had them drive it while it was raining and they discovered that cylinder 4 is misfiring. They worked on the cylinder. The vehicle runs well, until it rains or I wash it.
My questions to the group, "If everything is OK, how come it is misfiring? What are they missing? What is the connection to the moisture?"