Ford - Explorer :: 2000 - Cylinder 3 Misfire Persistently / Engine Stumbles And Has Poor Acceleration
Sep 25, 2011
I have a 2000 Explorer 4.0 SOHC that I'm having a persistent problem of cylinder 3 misfire. I've changed plugs with Motorcraft plugs set to the proper gap, put on new wires and have checked the resistance across the ignition module, both primary and secondary without change. I doubt that the problem could be the ignition control module as only cylinder 3 is affected. I have Auto Enginuity that I use to read the codes, attempt a repair and then clear the codes only to have P0303 appear again. Obviously the engine stumbles and has poor acceleration.
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I've got a misfire problem with my Focus. It started about a month ago and did not trip a code until last week. It stumbles on acceleration between 2,000 and 4,000 rpms. It is only a slight stumble and although noticeable, it does not impede driveability much. Last week I was able to get it to finally trip an OBD code. P302 - Cylinder 2 misfire. I changed the plugs and wires with no effect. I thought I had it narrowed down to the coil or injector until my wife noticed a new wrinkle.
Under normal driving conditions the misfire is annoying, but my wife found that if she turns on the A/C, it is undriveable and will not accelerate past 30 mph without some patience and a neck brace for the bucking. My first thought was the A/C compressor was freezing up. I turned off the A/C and left the blower on and it would not stop missing. I turn off the blower and it smooths right out to the annoyance I described first.
Right now I drive the car without A/C and blower whenever I accelerate. If I'm going a steady speed, all is well and I can run the blower and A/C.
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Well, I have been through the tech folder and all over the forum reading but cant seem to come up with a good first step. When i accelerate the truck shakes, by the sound it seems that its missing a cylinder. I guess it could also be the motor mounts. Besides replacing the plugs and coils, is there something else that could remedy a misfires or dead cylinder?
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Computer also said to replace Camshaft position sensor. The plug is getting spark and appears to be getting fuel. the plug was moist not dry. How ever i did notice the egr pipe is completely broken free from the header. Which I am replacing. Since it is reading lean on bank 2 could this alone cause more fuel to be dump in the cylinder 2 cause the plug to be too wet to fire? if not what might the possible problem be? 2000 Ford Explorer 4.0L ...
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2006 ford f150... Mine started out as a misfire problem which I first changed the plugs. I followed the Ford TSB and got all 8 plugs out with no problems. Still misfiring and setting a code for bank 1 catalytic converter inefficiency bank 1. By the way bank 1 is passenger side. After changing bank 2 because the guy at Advance auto said bank 1 was drivers side. Still setting misfire codes and for bank 1 cat. ineff.
So after installing new coil packs and 2 injectors, Still misfiring #3 and #1 and cat. ineff. bank 1. Decided to buy my own code reader, which is a must if you are going to try to work on these new vehicles. Decided to unplug o2 sensor to see where bank 1 really was. Thats when I found out bank 1 was indeed passengers side. Changed o2 sensors. Still misfiring. Decided to buy the true bank 1 cat converter.
Dropped old bank 1 cat and found all of the internal workings all broke up and clogging converter. Truck runs like new. I spent 178.00 for bank 1 converter at pep boys. After spending O approx. 600 in other parts that didnt fix it. I think the spark plugs not being changed until 115000 miles caused the converter to go bad. Buy a code reader and it makes it a whole lot easier to diagnose your problem yourself. and save a whole lot of money throwing new parts at it.
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After almost an entire year of trouble-free running (with the exception of replacing a ground strap), my 2009 accent decided to start bucking and shuddering again. It only does this when warmed up, runs perfect cold. In the last 16 months, I've replaced the plugs, coils, battery, PCV valve, and ground strap. Car starts with zero hesitation.
Strong battery and starter, consistent output from alternator. After @5 miles, the car stumbles on acceleration, and idles sporadically. While looking at it tonight, I noticed a few exhaust brackets under the car had broken, and the flex section of the intermediate pipe had torn open. Could this presumed exhaust leak be causing the crap running performance?
My "exhausted" brain thought it could cause the O2 sensor to misinform the ECM, resulting in the P0300 code I pulled...
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OK, got a check engine light today when I fired up the Ranger. Like I posted previously it is running kind of rough so guess I know why now.
Took it down and got the codes read it have a miss fire on cylinder 5. Picked up some plugs and wires, got to get those E3's out of there, but kind of think that's really not going to fix the problem. So that probably leaves the coil pack or injectors.
So what's the consensus on the best coils to use? Also, being an 18 wheeler for more years than I care to remember, I've learned swapping just 1 injector is never the way to go. So whats the best type of injectors to get and where the best place to get them should it come to that?
Oh, it's a 2000 3.0L Flex fuel 5 speed.
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After scouring through hundreds of threads on this forum (which is Awesome, BTW), it seems as if this misfire / rough idle thing is fairly common (which is scary!!). CEL is on steady. Had the codes pulled; P0301, P0302, P0303. At the recommendation of the mechanic, I had the plugs replaced...no improvement. He then replaced the ignition coils...no improvement. Just finished replacing the MAP sensor. This actually had a VERY temporary positive effect. However, after about 5 miles of driving, the misfiring returned. Took the car to the Hyundai dealership, and they acted as if they didn't want to fool with it. They referred me to a couple of local repair shops...????
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2000 GTI GLS 2.0L ... I understand I need to replace the Ignition Coil Pack on my car. I have looked on ECS Tuning to find the coil pack, but from all the pictures I see of other people coil packs they look nothing like what mine do. So I'm wondering if they are different for my specific car? So the issue that I have is my engine sputters sometimes, but more so when is wet outside. Its only cylinder 2 misfiring currently, and I replaced my Fuel Filter and Fuel Pump already in the past 4 or 5 months. Also a local shop had done some work recently and I know they had replaced the spark plugs. So I'm just wondering what coil packs I need for my car, and how I would go about replacing them. From what I saw online with other 2.0L (They weren't GTIs tho) was that the coild pack was behind the SIA pump or something like that, and they are a small black box. It looks to me that my coil packs are inline above the spark plugs and cylinders?
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Okay so last year i bought a 2000 celica gt manual with 50,000 miles, and currently has 67,000 miles. A few days ago I started to notice the engine was running rough and then about 10 miles later the chack engine light came on. I promptly went to the auto parts store to read the code. I was informed I have a cylinder 1 misfire. Naturally i replaced the spark plugs with NGK iridium, reset and rechecked engine code. Same code. Next i swapped the coils from 1 and 2, reset and rechecked. same code. I then swapped fuel injectors from 1 and 3, rest and rechecked. Same code. So now i am a bit stumped.
Only faulty equipment prior to this incident would be 2nd gear synchronizer. Only applicable above 5,800 RPM.
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I have just changed my clutch and machined my flywheel on my 1.5ltr 16v dohc 2000 lc accent. I used all the correct trans fluid and refilled and bled the clutch fluid. It takes of from lights like a new car but if you put your foot down around 40kph it revs out a bit and does so through all gears untill you reach a bit of speed. What is going on?
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I have a 2001 Acura MDX automatic transmission that at least once a day when driving around town, will suddenly loose power, RPM's seem to be stuck at 2000, and then surge up to 5000 with no forward motion. When I try to accelerate again, the car "stumbles" forward until the RPM's settle back down to between 1-3 and the car drives normal. This is creeping me out...any thoughts? Valves have been adjusted.
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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
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2001-F150 5.4 Eng. bucking/stumble. I think my problem is slightly different than what I am reading about. Here is what I get (125k miles):
* Engine only bucks/stumbles intermittently and not at idle or at harder acceleration (this bucking is really harsh and makes the truck feel like a learner trying to drive a manual transmission and it is jumping down the street). The engine stumble is not a regular timing such as a cylinder going out and staying out for a period of time. It is quite a random pattern to the jumping
* Originally thought it was humidity related, but now I realize it happens in any climate
* No stumble in neutral at any rpm... only at a stop if I put it in a power brake load.
* When the stumble shows up, it seems like the throttle is around 10-25% (my best guess)
* Sometimes goes days without issue, but sometimes every ride and virtually every acceleration.
* Normally no stumbling at highway speeds, unless going up a hill.
* Every time it stumbles, it can be eliminated by either backing off on the accelerator some, or hitting the accelerator harder.
* No engine codes or CEL has ever come on
* Fuel mileage appears to be the same before and after the trouble started
Here is what I have done to try to correct it:
-> Fuel related (bad gas)... tried to run the tank as close to empty and fill it with fuel from different stations... when this didn't work, I have added HEET to it to dry up any water in tank.
-> Fuel delivery... replaced the fuel filter... seemed to work for one day, but then the gremlins came back.
-> Fuel delivery... ran multiple injector cleaners through tanks of gas.
-> Intake... replaced the filter.
-> Electrical... I don't believe this is related, but my battery died... parts store tested the system and stated the alternator was bad... replaced it, and took the old one to the parts store for bench testing and it was 100% OK... even thought the old showed OK, I left in the new one as a precaution. Only other item was a set of plug changes around 30k miles ago... I think I put in the super duper Bosch plugs with a lifetime warranty.
Current thinking and items I don't understand:
A) The bucking is so severe, it appears to be a random harsh loss of either fuel or ignition. A component that has failed electrically should give me a fault code with this level of severity. No trouble codes or indicators to electrically sense this disturbance...
B) For the fuel path, the most likely item is bad gas and I emptied my tank by running it as close to empty as possible and then used different gas and HEET to eliminate water. THIS MIGHT STILL BE THE CAUSE???
C) Another one for the fuel path is an intermittent fuel pump electrical connection or a weak pump from a pressure point. But if this is the cause, then why does it dissappear upon harder acceleration?
D) One last fuel thought is injectors... perhaps one or more have a range of delivery that they don't work properly... but this doesn't make much sense as at idle and harder accels are fine
E) From an ignition standpoint, perhaps I have failing COP's. I have not just gone out an replaced them due to my limited budget and the difficulty I read about changing them. Again, if one of these is failing in an either open or short condition, the computer should set a code for a misfire for the related cylinders. I get nothing. Hence my hesitation in making this change so far.
One thing i don't understand from the various posts is that the cops can fail under loading. what makes this happen as electrically, i don't think they can detect a load or not? it is hard for me to also understand why my truck would allow me to back off on the throttle or hit it harder and the issue disappears.
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I own a 2003 Ford Ranger 4x4 Automatic with the 4.0l V6. I bought the truck a little over two years ago with 150k miles. The Engine had alway had a slightly rough idle and I never really noticed until a friend pointed it out at around 170k. Every time the pump engages after a short warm up period there is a distinct stumble in the engine, although it never stalls or trips a check engine light. I have replaced the spark plugs with four prong pre gapped Bosch platinum plugs and new plug wires as well. I have installed an Optima red top battery that tests at 1100cca and have tested the voltage draw when the AC engages and it only drops .2 volts from 14.48v to 14.24v. I thoroughly cleaned the MAF sensor and before changing plugs I ran a can of non chlorinated brake cleaner through the throttle body to clean out carbon deposits and dirty throttle body. The engine still stumbles. Yesterday at 182k I disconnected the low pressure switch on the AC pump and boom, smooth low idle with no stumble. What could be wrong with the AC pump that could cause this stumble in the engine?
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2000 Tacoma v6 has has always ran good, but has check engine light code P300 & P306. cly 3 & cly 6 missfire, lean bank 1. Vacuum test showed no problems.
I've changed plugs & wires, switched coils around cleaned mass air flow sensor, checked timing. Ran Seafoam through intake, and gas tank. Check engine light went out for about three miles, then came back on. What else can I do to keep that blinking check engine light off?
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I just got a 4.6 4WD Explorer in for rough running. It had timing chain noise and some odd codes for primary coil H codes along with cylinder 8 misfire.
I replaced the coil to get rid of the "H" code and it was fine. Still misfires on 8, and I really don't care because it's coincidence that the timing could be affecting it or perhaps.... bent valves!
The vehicle starts and idles a bit rough. Can't go very fast, and of course I know I should run it as little as possible!
Here is the deal, how should I present this to the customer? Should I let him know that some valves could be bent after replacing the chain (and all associated parts) and that it could still be effed? Or will I be fine after replacing? Pretty much, where they had a tensioner failure/guide breakage and valves bent too?
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On my wife's '99 Explorer, she just acquired, we had a P0303, #3 cylinder misfire. I found the plug cracked and replaced it. Do the codes reset themselves or do I have to do it? I'd rather not disconnect the battery and reprogram the radio.
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126000kms on 03 explorer 4.6 truck started. Running rough at idle and under load.... Code came up for cyl 8 injector. Replaced injector... problem still there. Switched cop and plug with another cyl and plug.... same code and cycl 8 is definitely not working. Would a generic problem always affect i cylinder. I even checked wire clip on for injector... it appears ok. There is power to injector wire clip.
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95 explorer 4.0l ohv. I go to take off and then come to a stop after about 10-15 feet, i just give it a little gas then lightly press the brake, rpm's drop to around 400-500 then back to normal. I have replaced:
IAC
MAF
Plugs & wires
Coil pack
intake manifold gaskets
fuel system cleaner
fuel filter
air filter
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I have a 04 f350 6.0 with about 195xxx miles on it. The other day my truck started acting up. It starts and idles without a problem and drives fine till the engine gets to operating temp once there I cannot accelerate quickly like getting onto the highway to get up to speed it just the motor just goes quiet and won't accelerate. It usually does this a little after 2000 rpm. I can let off the throttle and slowly get to speed as long as I don't go past 2000 rpm. No check engine light was not on scanned it and got p0611 for the ficm. I tested the ficm and it read 48v with key on. While truck was running I got 46.xx v then Started to climb to almost 48v. The truck was warm but not at operating temp where the problems starts(didn't have time to let it warm up all the way) could these symptoms be the ficm still? What else should I test?
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