Yaris/Scion & Vitz :: Misfire On Cylinders - Codes P0301 And P0304
I recently had detected always misfire on those cylinders. Any relation between them?
View 1 RepliesFord - Taurus :: 2001 - 3.0 Engine Misfire Consistently / Code P0301
I had a consistent misfire on this car and finally got a P0301 trouble code. I installed new Autolite AP 104 plugs and wires. Now, when I start the engine. it runs perfectly. But when I put it in gear, it misfires. After a minute or so, the misfire clears and the engine runs perfectly. I have not received another trouble code. One thing I did notice is that the plugs I took out (Motorcraft AWSF 32P) had a much larger gap than the .044 the associate at AutoZone set the new plugs to.
View 7 RepliesPrius (2004-09) :: 2006 - Got Codes P0301 And P0302 / Misfire At Low RPM?
This has been an ongoing issue with our 2006. We purchased the car about a year ago and have put on just over 8,000 miles. Rebuilt the battery pack and replaced the 12v battery. This is my wife's car and I have a 2005, so I have done some diagnostics, tuneup, and even swapped some parts between the two cars trying to narrow down the issues.
Only recently have codes been recorded. The car is has a noticeable misfire at low RPM. Here is what has happened up until now:
11/29/15 - replaced spark plugs - #1 was fouled so I swapped coils between cylinders 1 and 4
2/25/16 - replaced 12v battery with new battery
4/1/16 - P0300, P0301 codes were first recorded and reset to see if they came back
4/10/16 - swapped Integration Relay with my 2005 (part # 82641-47010). My 2005 ran poorly after the swap, so I put a used one in my 2005.
Ford Excursion :: 2000 - Misfire - Got Codes P0301 And P0302?
2000 Ford Ex 5.4 V8 175K miles
Top of radiator (plastic part) had a small crack and started leaking on drivers side. Fixed with JB Weld. Ran fine for a day. Now I have a bad misfire and codes P0301 and P0302 (Cyl 1 and 2). Cleaned MAF and checked Air Filter. All good. Plugs replaced at dealer less than 20K miles ago.
So I took off Cyl 5 (easiest) and found that the boot is fine but the collar on the boot is done for. Can this cause the issue?
Ford F-150 - 1997-2003 :: CEL Codes P0304 / P0456 / P0171 - Misfire On Cylinder 4
So, my 2003 F150 4.6 that I just put back on the road after a four month break is running like crap. I took it off the road for the winter because it was missing (no codes) and didn't feel like dealing with it then but after running it for a day the CEL comes on. It shows the following:
P0304 - hoping it is a coil pack
P0456 - pending. Gas cap?
P0171 - pending. One bank too lean?
Does the 171 code possibly have to do with the misfire in Cylinder 4? I know it is impossible to tell yet but am hoping there is a potential connection.
Before I parked it in January, it was running a bit rough and stumbled on acceleration but never would show a code. Now all this. Going to change the coil first, tighten the gas cap, check for leaks and see what happens but is there anything common on these trucks that I should also be looking at?
Elantra XD (2001-06) :: Random Misfire On Cylinder 2 / 3 And EVAP Codes
Trying to troubleshoot my 2001 Elantra (173k). I'm having intermittent trouble codes being set and I'm wondering if they may be related:
P0302
P0303
P0446
The cylinder 2 and 3 misfires are relatively recent. Plugs and wires are visually ok (and not that old). I swapped plugs 1 and 4 with 2 and 3 to see if the plugs are bad. It took 3-4 days, but the P0303 set again (and it's very intermittent - car will noticeably lose power for a few seconds, code set, then run fine for several days). I also sprayed carb cleaner on the intake manifold gasket with no change in engine idle, so the gasket appears to be intact.
I had read in a forum somewhere that the misfires could be related to a vacuum leak, which could also be setting the P0446 code. I removed the charcoal canister and inspected the lines - visually ok.
I bench-tested the canister control valve and it did operate, though I noticed some charcoal blocking the valve so it would not close all the way when energized. I used compressed air to blow the debris out of the valve and it appears to close properly now.
I went to hmaservice.com and noticed there are no instructions for the P0446 DTC. I've been using a Haynes manual instead. For quite some time now when refueling, the fuel nozzle shuts off every few seconds (I have to slowly put the fuel in to avoid).
Some questions:
- Can these codes be related?
- Based on my symptoms, should I replace the canister control valve? What about the charcoal canister and the charcoal air filter - should those be replaced as well?
- What else should I check?
Toyota - Avalon :: 2000 - Rough Idle - Steady Misfire - Getting Codes P1150 / P0300 / P0302 / P0304 / P0306?
I have a 2000 Toyota Avalon XLS with 134k miles, engine is a v6 (3.0). It has a rough idle and a steady misfire. You can drive it sometimes and it will run perfect and you can drive it sometimes and it will misfire. I am getting codes P1150, P0300,P0302, P0304,P0306. Driving me nuts.
View 1 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 RepliesFord - 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 RepliesPassat (B5) :: 2001 - Misfiring - Got Codes P0300 / P0301 / P0302 / P0303?
i have a 01 passat with a v6 in it on 4 motion and im having an issue with soem mis-firing
i pulled the codes. P0300 P0301 P0302 and P0303 which are all saying that there are missfires in cylander 1,2 and 3 and random miss fires.
im also getting a P0340 which is cam sensor A or the right hand bank. problem is i just replaced the cam sensor and when the motor got warm, the code came back. I was told by the previous owner that the car needed a Coolant Temp Sensor....can this be the cause of my mis-fire issue? hear me out.... it only happens when the car is warm so im thinking that the car is warm but the ecu thinks its cold cause its not getting a good signal from the CTS. thus its either advancing the timing as if the motor is cold and cuasing a miss fire or something along those lines. any thoughts?
S-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 RepliesCamry :: 2002 - P0304 Code / Misfire Occurring
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?
Golf 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.
Corolla / Matrix 2009-13 :: 1.8 L - Misfire Code P0301
I have a 2009 Corolla with a 1.8 L. I have the misfire code P0301. I have changed the plugs, ignition coil, and fuel injector on cylinder one. It still has the misfire.
View 5 RepliesAccent LC (2000-05) :: CEL Fault Codes P0304 And P0441
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?
Silverado :: 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?
Ford - Explorer :: 2006 - Misfire On Cylinder 3 And 4 Consistently
My wife's explorer has developed a misfire on cylinder 3&4 consistently. I did have cylinder 2 misfire once. But have not had it come back. The explorer is a 2006 4.6 limited with 130000 miles. Originally it was misfiring on cylinder 3. So I swapped the coil packs between 2&3. Cleared the codes. Still got a cylinder 3 misfire. So I went and bought new plugs for it. Cleared the codes. Still misfire on cylinder 3. Swapped injectors 3&1.
I took it out and romped on it and now I get cylinder 3&4 consistently misfiring. Now I got me to thinking that the only side that is misfiring is the pass side. I was going to swap o2 sensors but couldn't get the driver side out so I went and bought a new o2 upstream for the passenger side. Still get 3&4 misfire. Thought it might be fuel related so I pulled the filter. It was kinda tough to blow through so I put a new fuel filter in it. How the hell can I check the fuel pressure without a fuel fitting? I am now thinking it might be fuel pump, plugged cat, or low compression