Ford - Taurus :: 2001 - 3.0 Engine Misfire Consistently / Code P0301
Apr 17, 2016
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.
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I would like to find out why my car is misfiring before throwing parts at it. I have a basic level of mechanics and have checked a few things before posting here, which may or may not have ruled out some possibilities.
The problem: I have been consistently getting P0301 and P0304 but only happens sometimes, while other times there is no check engine light. I first checked the ignition coil, right side of it, that controls cylinders 1 and 4. Did resistance test, measured for voltage, and checked the wires for continuity to the connector, with everything coming out good. I know a few must have had issues with the cheap pigtail connector like me so I went and changed that but still got the misfire codes. I then put in an older known to be good working coil but no change.
After that, I removed spark plugs 1 and 4 and put them where 2 and 3 go but still got the same codes P0301 and P0304.
A friend who is a mechanic for Nissan checked the spark and wires, saying they were fine. He then checked the injectors and noticed that injector 1 didn't increase in ticking sound when RPM increased. He said I should replace injectors 1 and 4 to see if that changes anything or switch injectors 1 and 4 with 2 and 3 to see if the codes at least change. I removed them all, got two of them from junkyard just in case, made my own tool where I pumped straight fuel injector cleaner through each of them with pumped air, and put the two from junkyard on cylinders 1 and 4. I still got the same codes so then I switched injectors 1 and 4 with 2 and 3, which didn't change the codes.
I was told by another local mechanic shop that it's definitely the coil but I knew it wasn't.
Other info: I am not sure it would matter when dealing with a misfire but I borrowed a code scanner and saw that the Long Term Fuel Trim was -7%. I researched that and it means that the car is running rich and the computer is being told that it needs to run lean. I am not sure that this would make only two of the cylinders misfire and the freeze data shows that same negative LTFT for when the P0301 happened. I also know that there is an air leak at the gasket where the front cat connects to the flex pipe/rear cat. I have also gotten a rear downstream 02 sensor code once within the past month but it hasn't come back.
Would the LTFT being lean have anything to do with the misfires? Would the gasket between the two cats cause the 02 sensor to get a faulty reading? If so, would the downstream 02 sensor be able to adjust to a lean fuel mix? What else should I check?
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I have a 99 Volkswagen Passat 1.8 Turbo Automatic AEB engine. I recently did a rebuild on it and ever since I keep getting this code P0301 that says "cylinder 1 misfire". The engine is also running rich and the spark plug in cylinder 1 keeps getting gummed up. I've changed the coil and the spark plugs and the injectors and it works temporarily but then the problem keeps reoccurring.
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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.
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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.
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I 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.
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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.
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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?
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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.
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'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.
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2009 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?
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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.
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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?
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Wife's car - 2005 Taurus, 6 cyl, 3L, OHV, 83K miles. CEL came on and code came back as "P305 - cylinder 5 misfire detected". The car had been running rough. I changed the plugs, wires and coil. After changing these (and clearing the code) the car seemed to run better for about a week. Today it suddenly started running rough again and the CEL came on with the same code. I'm guessing now this is probably fuel related as opposed to spark related??? As a side comment, the tachometer has been fluctuating as of late as well (again, intermittently).
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01 Taurus, 3.0 pushrod motor. Single 6 pack style coil. I replaced worn plugs 2 months ago for misfire. Car seemed to run fine. Now, I have misfire again. Code is for single cyl, 0303. Would u expect plug to foul, or bad wire, or possibly bad coil? I don't know how these ford coil packs fail. Can u lose 1 or more spark outputs with them?
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We 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.
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Question about a 4th cylinder misfire question? The engine light has been on off and on for about one year. I have not had any problems with performance until about one week ago. sometimes it shakes and the engine light flashes when it is idling. Today my husband drove it, and it would not accelerate when he put his foot on the gas, but it would pick up speed when he left his foot off the gas! Weird. This is an old car (2001 Ford Taurus station wagon) with 137,000 miles on it. We need this car.
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Have a code PO305. Replaced coil. Plugs and wires. Checked front injectors. They make that correct clicking noise when listened to with a long screwdriver touching their bases. Attempted to listen to rear injectors. Only could touch outer two and they make more of a swishing noise. CEL will blink after driving higher speeds but will return to steady on when engine is turned off and rested for a few minutes. Does have new fuel filter. Newer pump. Newer Cat. CEL came on when driving at highway speed with cruise control on. Engine is a 3.0 not flex.
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My wife started our '99 Explorer last week and she said that the engine was rattling. I started it up when I got home and it sounded like something had let loose in the engine. We took it a local mechanic and he basically said that the motor was shot. I pulled the codes and it doesn't look good to me but I'm not a mechanic. Codes are:
P0301
P0302
P0303
P0173
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So 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.
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I have an old 2000 Ford Taurus that has been having some misfire issues. I replaced the wires and plugs about a year ago and hooray! it worked... until about a month ago when the check engine light came one. Misfire in cylinders 1 and 3... again. I ran some SeaFoam through and it did okay until this week, when the warning/flashing check engine light came back.
It is idling very hard (expected) and feels like it is trying to stall, even before the misfire came back (also to be expected??). So here is the question: is this a coil pack issue, or something more sinister (and expensive)?
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