I have a 2010 VW GTI, approx 48,XXX miles and need a hesitation diagnosis. The car is throwing a P0301 code, I have replaced the plug, coil, and check the coil harness. I think it may be the injector, so I replaced the fuel filter but don't want to do the injector on a whim. I don't want to take it to the dealer if I don't have too!! I live in Silver Spring MD.
View 1 RepliesI have a 07 Sonata V6 that misses only when warmed up, runs fine when cold. code p0301 for cylinder one misfire, I have replaced the plug, coil and injector for cylinder one and still the same. idles and runs perfect when cold, dead miss on number one cylinder when warmed up.
View 1 RepliesTitle says it. Cat is done. Threw code p0420 and am experiencing hesitation at WOT. Already replaced my front o2 (cbfa) and now I'm debating whether or not to get a new downpipe. I daily the car and am wondering if keeping the car as is for a while will damage anything. Cts turbo has a sale for a catless downpipe.
View 5 RepliesI 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 RepliesThe vehicle is a 2002 Ford Windstar van with a 3.8L V-6 engine. It has a constant miss on the #1 cylinder. That's the one on the backside of the V-6 on the passenger end of the engine. I have changed the plug(s) and still had the miss and P0301 code. The plug's wire has about 7500 Ohms, so it's not the problem. I hear no snapping of a high voltage short to ground. A friend suggested that the injector might be the issue, but I am of the opinion that the scan code shows only a high tension or secondary ignition system issue, and not fuel injection issues. I'm thinking the problem is more likely to be the coil pack.
View 19 RepliesWe bought a used 2001 Grand Am (V6 automatic) a few months ago. Mileage was just under 100,000. It was running decently at first, but that improved once we did more maintenance. It's gone from about 150 miles on the highway on a full tank to about 250. A lot of the problems didn't reveal themselves until we took it onto the highways. These are the parts we changed in the last 2 months:
-new battery (old one was 0.1 above fail)-all 6 spark plugs-catalytic converter-front oxygen sensor-oil filter-timing belt-pcv valve and breather hose (old one melted)-all 4 shocks/struts
Latest problem is OBD code P0301 cylinder #1 misfire. The entire car started to shake when we were in low speed in a drive thru. It only seems to shake in drive gear and it does it the whole time. It doesn't shake in reverse or any other gear. Found out #1 spark plug was cracked and a chunk of the ceramic portion was missing. It got replaced but that didn't fix the problem. Haven't noticed any white exhaust yet. The ignition fails 1/7 of the time since P0301surfaced.
The last problem we had was P0420. We went to 3 different shops and nobody was able to fix the problem properly. It wasn't until the pcv valve and breather hose were replaced that the code disappeared. The valve was actually cracked and parts of the breather hose were melted. I can't understand why nobody noticed that.
I know there could be a lot going on, but I was hoping the possible problem could be narrowed down.
When i got my 2000 jetta vr6 it has a CEL for misfires. Searched this board and google already. Im thinking injectors (havent checked yet) I noticed something weird the other day. At a light i get the CEL flashing. Then after a bit it will come on and stay on. I plugged in my generic reader and deleted the codes. When the CEL is on I get loss of power and hesitation. When its deleted the car runs better. I get my power back. I looked in the coolant tank and see no bubbles. Could this be the ECM? Im still going to get injectors but want to buy the gasket and anything else I am going to need to put it back together. I already cleaned the MAF, replaced some vac lines, coil pack, wires and checked plugs (gapped at .28) ...
View 4 RepliesSo I changed my spark plugs, due to an error code saying p0301 which means cylinder one misfiring. I reset the engine light disconnecting the negative battery terminal. Once it reset it ran rough for a few miles. I put about 50 miles on it and it seems better.
View 2 RepliesI have a 2009 Prius that I purchased 6 months ago and have been really happy with it until the last couple of months. As the weather is getting colder appears I have a misfiring problem on start-up
I have had this problem now for a little while and have been trying to get it understood before paying $$ at the dealer for "maybe" solutions.
It started as the weather got colder. Intermittently the check engine light would come on. Then after a few days would go off.
I have considered water in the line: fuel injection cleaner/antifreeze
I have considered bad gas in the tank: problem persists several fuel tanks later
I have recently purchased a trouble code reader/diagnostic that plugs into my laptop. Trouble code is p0301. Cylinder 1 misfire.
I have taken it in to the shop.They tried:
>>moving the ignitor coil from cylinder 1 to cylinder 4,
>>and also tried moving the spark plug from cylinder 1 to cylinder 2.
>>performed compression test. Ok
The dealer suggests replacing the injector line for $1400+.( They did this with warm engine. They have not diagnosed cold engine yet. That is new, read more,...) I still have 5K kilometers left on the power-train warranty. If it is power-train I would like it resolved before warranty expires.
Now. Some new info as of yesterday:
Up till now I was not using the diagnostic monitor real time. but that started yesterday,... Last night when I got home from work while the engine was still warm I connected the diagnostic monitor and went for a drive. Every few minutes I would pull over and refresh the cylinder misfiring data. I had hardly any misfires across all the cylinders at all. Maybe 1 or 2, here or there over the span of a 10 minute warm engine ride. Up and down hilly terrain. Nothing that came close to triggering the p0301 trouble code. I parked the car outside and let it rest overnight.
When looking at the engine from the front of the vehicle. what numbers are the cylinders from left to right? To curtail off of that question where do I locate the corresponding ignition coils to these c I have been dealing with intermittent misfires on cylinders 1 and 3 codes P0300, P0301, P0303. I replaced the spark plugs to no avail. Whenever the vehicle shudders the headlights dim and the shuddering is worse when the vehicle is placed in gear, the A/C fan is on, or the vehicle is accelerating. Once I reach a certain speed, usually 35-40 mph, I don't notice until I again slow down. I replaced the spark plugs the day after I had the first issue appear which read code P0301. Prior to installing the spark plugs, I experienced a severe loss of acceleration power, but now only experience the shuddering.
2011 Hyundai Accent 63500 miles ....
'07 Avalon with 169k miles. I replaced all 3 back coils and 6 plugs back in December when I had various misfires, but the most common code was P0301 which is cylinder 1.
Car ran great until last week when I made a hard left and accelerated. CEL started flashing, read code and it's P0301. Every time I accelerate half throttle or more I can set the code off, but then shutting down car and restarting it drives fine, until I go half throttle. Car runs better when cold, and worse when I turn left and accelerate.
As long as I don't mash the gas I can drive for a half hour or so without the strumbling/hesitation. Surely the new coil hasn't failed so soon, I hate to pull the wipers, plenum,etc. and buy another coil just on a chance that might solve the issue. Car is only throwing a P0301 this time, no other codes like before. I've read a clogged cat or sticky exhaust valve could cause a cyl misfire.
My 97 F150 through a CEL Tuesday night P0301 so I picked up a new plug because it's cheap and simple, but that didn't do anything. Spark plug wires are about 3 months old, I also swapped injectors between 1 and 2, and misfire stayed with cylinder 1. It also gained a tap when the misfire started but only above idle, but it doesn't sound like a rod knock.
I also noticed if you unplug injector 1at idle it taps/knocks 3 or 4 times, however if you unplug any of the others it doesn't do that. I checked and I definitely have good spark from the plug. I plan on picking up a new compression tester tomorrow since mine never was returned. If you take the oil fill cap off it doesn't have any blow by at idle, however if you rev it you get a quick cloud out of it.
I thought about picking up a kit to check the injector pulse.
This happened xmas shopping with the wife. Started misfiring on the highway,took the 1st exit to find a garage as I am 20kms from home. The vibrations were worse at stop, but made it to a garage. They gave me the p0301 misfire cylinder 1, said they don't touch 5.4 plugs, told me to go to ford 2kms down the road. NICE. 4 in the pm, FORD dealer worse case scenario. Nope gave me a loaner told me come back at 930am. Truck was just waiting for an injector when I arrived. Plug & coil were good injector was shot,changed the fuel filter & oil change.
View 6 Replies2009 corolla 1.8l 155,000 miles. Replaced iridium spark plugs at 100,000
I got a CEL few weeks ago, P0301 Toyota - Cylinder 1 Misfire Detected
Car has been running bad for about 2 weeks now, excise noise on the highway, especially up hills.
Yesterday, I took a look, replaced the spark plug in cylinder 1, same results. Checked the coils using one of those flashing tools, all 4 flashed quickly, with no breaks in flashing. put it all back together, cleared the code, went home.
Took it out for a drive today, and it started running way worse. Checked the CEL, and now I have both P0301 and P0303 Misfire on cylinder 1 and 3. Barely made it home, ran VERY VERY bad.
Got home, and made a video of it. It just kept dying. Check it out here. [URL] .....
Also, when it does run, it almost sounds like I can hear excess air, its hard to hear in video, but doesn't sound right. Maybe air leak? How do I check?
My wife's 03 Passat w/ 1.8t is bucking and lurching throwing a P0301 (Cyl 1 misfire) code. We have about 58k on the engine and had the dealer do the 40k service 2 years ago.
So far I replaced cyl 1 spark plug, swapped and then replace coil pack with new. My choices for parts were limited on a Friday night and these are el cheapo Autozone parts. Still missing and throwing DTC, I don't really have access to Vag-Com anymore (just OBD reader at parts store) and I don't have a Bentley's either (I know there's some eye rolling going on now).
How to troubleshoot the cause so I can make a decision to take to mechanic or do a few more parts swaps between now and Monday. I've got tools and a multi-meter. I used to have Vag-Com but it isn't supported on my new laptop (Vista), I tried the USB extension cord on my desktop but it is hit and miss.
So I dropped my prius off to get looked at for error code p0301 number 1 cylinder missfire. They ruled out Spark plugs, coils and fuel injector. What else is ther? Also could it be the battery or even gas?
View 12 RepliesI 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 RepliesI am at about my wits end with this P0301 (Misfire On Cylinder #1) code on my 2003 Ford F150 4.6L. I've replaced the coil pack on that cylinder, all the spark plugs, and replaced the fuel injector on that cylinder. We keep clearing the code and it keeps on coming back.
The weird thing is that it only misfires after the truck has set for a few hours and then it only misfires when I first put it in gear. Once I am out of the driveway and on the road it's fine for most of the day unless I let it sit for several hours and then it might misfire again.
We noticed that the connector to the fuel injector is wobbly and doesn't snap tight to the fuel injector (before and after it was replaced) due to the clips on the side not working well. We zip tied it together this afternoon to make it fit tightly to the fuel injector to see if that works.
What could be causing this? Other than that misfire the engine sounds great and the trucks runs very well.
I have a 98 F150 4.2L with code P0301 Cylinder 1 Misfire.
This is what I have done so far. New plugs, coil pack, plug wires, TPS, EGR, EGR Vacuum control regualier, DMCP, canister, all of these parts are new and was bought from the ford place. Have taken the egr value, and egr value bracket off to see if carbon blockage was present, but it was clean. It was clean in the motor also. Have blown air through the metal tube that connects to the egr value and it come out the tail pipe very good, so no blockage their. Have cleaned throtle body and injectors. Have tested fuel injector with tester and it works correctly. Motor holder pressure. Have correct fuel pressure.
Do not have any vacuum leaks, it holds vacuum correctly. Crankshaft sensor is fine. Went throw 4 cans of break parts cleaner, spraying on intake while motor was running, motor did not idle up or change. I have done all this and it still shows code P0301, and it still skips. Here's the catch, if you unplug the vaccum off the egr the misfire goes away, or unplug the EGR vacuum control regulator it goes away, or if you unplug the DMCP sensor it goes away, it does not matter witch one you unplug, the misfire goes away.
I have had several different test done the the truck, but all the test only show that one code P0301, they do not show any other codes, or problem's with my truck.
I have a 2006 F150 with a cylinder #1 misfire only code p0301. I have done new spark plugs, new coil packs, and new fuel injector on cylinder #1 with no luck. What to do next?
View 5 RepliesMy 2003 Camry has po301 fault code also have same code showing as pending. Can't find nothing on google regarding duplicate codes . The car starts fine, runs fine, idles fine. Excellent at high speeds I don't think the car is misfiring . Could it be a bad sensor giving me a false reading .
View 6 Replies