Ford F-150 - 1997-2003 :: 2001 - Misfiring On Acceleration But No CEL?
Oct 24, 2012
Need some input on miss firing on acceleration on a 2001 Ford SuperCrew F-150 Lariat, 5.4 engine. 200,290 miles.
Have replaced all spark plug boots covers (Sept 2012), number 1 plug (Sept 2012), 3 and 7 plugs replaced, 3 and 7 has heli-coil kits (2011) installed for blown out plugs. New in-take manifold (2010). New gas line filter, air and oil filters (Oct 2012) and oil changes every 3000 to 3500 miles. Have poured 12 oz. fuel injector cleaner in gas take two times with 6 to 7 gallons of fuel in gas tank (last 2 weeks).
Have No check engine light on for service engine but have had an diagnostic scanner analyzer plugged into driver side, in cab outlet, 4 different times to see if I have a bad coil on plug or other problems. No codes show up indicating any problems. The engine idles nicely when at stop lights but does have a slight intermittent miss at times when warmed up and stopped at lights. Engine misses when warmed up on acceleration (when it is under a load and on acceleration).
Had a mechanic tell me he could plug an analyzer into engine but couldn't guarantee he would find anything wrong. This sounded like a little snow in July to me and the mechanic didn't sound optimistic.
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I've got an issue on my Escape, and I'm at a dead end. '01 XLT V6 150K miles.
About a week ago, driving to work, it started stuttering or misfiring while accelerating up inclines. Cruising and idle were smooth with no issues. I found that if I let off the gas as it was stuttering, it would stop, and then I'd give it gas again, and it would be fine. It was pretty intermittent.
Opened the hood and the large vacuum hose that goes from the top of the intake down to the PCV, has an L boot that connects it to the intake. That boot was collapsed down on itself while the motor was running. It went back to normal when I shut it down. I felt the boot and it was very thin and worn out, so I replace the whole two piece hose, along with the PCV valve. The old PCV came out and was rattling, so I believe it was ok, but I installed a new one anyway.
Drove it after that and it still had the stutter. It was now also doing it just barely at idle. I'd hear the motor miss, and it would really start when I would give it gas. I thought it was still a vacuum issue, and that there were probably other bad hoses. I found two. There's a small hard plastic line that comes off the air intake hose from a T, and those lines go to the camshaft covers. The hard lines go to rubber boots on the cover, and the one in the back was in two pieces. Replaced it. No change.
The other line is a small rubber line that comes off a round component, (I still haven't found out exactly what this part is called), that is bolted to the drivers side shock mount, and has a couple soft lines coming off of it. One of the lines goes over the top of the motor and ties into a T right where that large PCV hose goes into the intake. The part is circled in red, and the arrows point to the hose in the attached pic.
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When I first bought my 2001 f150 a few mos ago there were no problems but I did notice once in a while it would give one little shudder when id accelerate. now all the sudden it shudders after around 20 mph all the way up to whatever the speed limit is. Then it smooths right out until I have to accelerate again. if I punch the gas and kick it down it will clear up but then it feels more like a surging going on.
I had the cruise set at 70 the other day and I had to slow down to merge to around 50 and when I hit resume it really started shaking bad and the service engine soon light flashed on and off for a few minutes then went off and hasn't came back on again. I took it to advance auto and no codes showed up. they said its probably the torque converter but after reading multiple forums I am not so sure now.
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I have a 2001 5.4 V8 with 55K miles and the tow package. On acceleration the engine makes a ticking noise. Engine seems to run fine, no misfire.
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Trucks throwing codes for cylinder 3 and 8 misfire. I pulled the plugs and both were covered in oil and cylinder 8s electrode was literally gone. so I replaced the plugs and within 5 miles it was missing again. so I replaced all plugs, all wires and coil packs. cylinder 8 plug had fouled out. Its a 4.6l 99. I have a mild exhaust leak where the manifold connects to the downpipe. but not bad enough I feel it should matter. it runs rough until about 3k rpm and then it kinda straightens out.
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97 F150 4x4 XLT 5.4L... I had two cylinders misfiring, removed COP, injectors and plugs. Reinstalled all parts and reconnected all sensors. Now I am not getting fuel to the injectors. Double checked for disconnected wires and hoses, checked all fuses and relays, also the inertia switch. Fuel pump does not hum when key turned on. Tried hitting bottom of gas tank. My question is, before I pull the tank again, is there something under the hood I may be missing. It does get quite crowded at the rear of the motor.
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I recently picked up a 2wd 2002 F-150 with a 4.2l V6 that has just over 300k miles. The CEL is on and I'm getting P1131, P1151, P0316, P0305 and an occasional P0301. It has a very distinct misfire from around 1,000 rpm and smooths out between 1,500 & 2,000 rpm, the idle rpm occasionally bounces (sometimes enough to stall), and the idle is sometimes rough.
I have replaced the plugs, wires, fuelfilter, and replaced a leaking PCV hose. As I have changed things the symptoms have improved some but they are still there. While capturing some livedata it kept going out of CL and into OL Fault. When it would the idle quality was crap and the miss was much more significant. I would have to put it into D hold the brake and run the RPM's up to just over 1k to get it back into CL.
After I got done with the data stream at idle, I set the parking brake held the foot brake and put the truck in D then ran the rpm's up to around 1,200 & held it there. The truck stayed in CL but it would cycle between misfiring for 5 - 10 seconds then clear up and run smooth for 20 ' 30 seconds, every time it cycled there was an audible click that could be heard. Also, the AC was off the whole time.
Live DataStream @ Idle: CL
CalculatedLoad Value - 12.9- 14.1%
EngineCoolant Temp - 103degrees C
Short TermFuel Trim B1 - 32.8%
Long TermFuel Trim B1 - 0.0%
Short TermFuel Trim B2 - 32.8%
Long TermFuel Trim B2 - 0.0%
Engine RPM - 816 . 846
[Code] .....
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I have a 1997 f150 lariat 4.6, at some point i started losing power, so of course I had my friend come by and check all the mechanics under neath the hood and besides needing caps and rotors all seemed well under there, so twice I've put it on a computer and it needs and o2 sensor, I've already checked my Cadillac coverter , and dropped and replaced my gas tank twice, I ended up having to replace a shock, it does run better when i put heat through it for a short time.
I've been checking my antifreeze and I am not losing none, I also did regular maintenance to it to figuring it was a fowled plug but still no good , so whats next ? coils ? I didn't replace my plug wires but I checked them all and they looked to be in good condition and I have a transmission filter kit to change that out I don't believe its been done ever ..
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I have a '99 F150 w/ the 5.4 and 4R70W, with 226K miles. I am experiencing what I believe is a TC shudder after the tranny shifts into OD between approximately 40-50mph. This sounds like a pretty common problem with this particular tranny, but some of what I've read describes the shudder as feeling akin to driving over rumblestrips, but what I'm experiencing is a very sharp, bucking. Is this how the TC shudder feels, or am I actually dealing with a misfire. Btw, I did completely change the tranny fluid with Mercon V, and added a friction modifier, but no change. I also read that the TC unlocks when the brake lights come on, so I tried lightly hitting the brakes when the bucking was occuring, but it continued.
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I have a 99 f150 with 171xxx miles and the other day it suck in second gear and start shaking and misfiring and would stall out. I took the truck and got the codes read and it threw codes for the tcc solenoid and shift solenoid. I put both in the transmission and it kepy doing the same thing. I check fuse 24 under the hood and it was blown, I replaced it and everything worked fine for a day then it blew the fuse 2 more times and i cant figure out why it is blowing that fuse. I cant find any shorts maybe pcm??
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Ok I got this truck from my mother-in-law for free with a blown head gasket cylinder 6 driver side. I did the replacement had the heads machined put it all back together by the book. Now I can't get it to fire on all 6 cylinders only 5 I think. Thought maybe bad gas (it sat since late November) put 5 gallons (over double the gas) fresh gas and half a bottle of b-12 chem tool. Dubble checked all plugs wires connections (coils plugs wires all new). I drove for about 10 miles oil pressure and temperature stayed perfect but no change in running truck shakes a lot and no real power. Don't sputter or backfire no engine codes other than imcr bank 2 open. Engine is 4.2l v-6 170k miles.
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2002 f150 4.6l v8... Truck is misfiring and the exhaust is smelling very rich, I have new coils and plugs, it also idles rough and stalls if i let it idle for more than a couple minutes. Could it be something with fuel delivery system?
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So I was given a 1999 f150 4.6. The transmission was supposedly either new or rebuilt. (I'm going with rebuilt) Driving it for the first time today, I noticed it had very little poor acceleration. When I would get on the gas (to the floor) the rpms would shoot up (3-3.5) but the truck didn't accelerate accordingly. It feels like the power it's getting to the wheels. Driving at highway speed trying to maintain a speed at over 70 the truck wanted to stay at 2500 rpms but if I let off the gas just a touch it would shift up (into overdrive I think) and level out at just below 2000 rpms, but if I accelerated even just barely, it would down shift and go back to 2500. I've also noticed the truck runs 5 mph faster than it reads with stock sized tires. I've check the tans fluid and it is bright red in color and at the appropriate level. I crawled under the truck and noticed the trasfer case mount was wet with fluid (not dripping) and the rear output shaft of the transfer case was also wet. Could this be a transfer case problem?
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I've had this truck since 2011. Ran great when I got it. Ive had problems with the calipers and I've replaced both the fronts. I keep up on changing the oil regularly. The manifolds started rusting away a little over a year ago. Not happening... The shaking started recently after I pulled a trailer with 2.5 tons of shingles on 2 separate occasions.
That being said, I can feel a little shaking while idling. It was really only bad between 500 and 2000rpms. After 2000 it almost felt like a turbo and it would accelerate really fast and smooth until the gears switched. I figured i should change the oil. Now the shaking is more violent.
Its a 2000 f150 5.4 v8....
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I have a 97 f150 with 4.2 4x4 auto. I have a bad miss under acceleration. if i ease on the gas no problems. stomp it and it chugs and pops back thru airbox til it gets to 2500 rpm then clears up. If I shift it manually and keep rpms up its fine till it gets below 2500. I have replaced spark plugs, plug wires, fuel filter, upper and lower intake gaskets, cleaned injectors, new air filter and cleaned o2 and mas sensors. Had vacuum system checked and was told all good.
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I have a 2001 F150 4x4 5.4l with 105k miles. I started it up today to go to lunch and it made a knocking sound on start up that lasted maybe 20 seconds. So i shut it off and checked oil. All ok. Started it up again and it knocked but not as long as it did previously. I started to drive and higher in the rpm range before the trans shifts it makes the same knocking sound. Left off the pedal it goes away then rev it again it doesn't make the knock till around 2000rpm mark it I remember correctly. It makes the noise in all gears, parked or driving. It runs great, no power loss or misfire. Could it be a spark plug on the verge of blowing out or is it time for a new motor? I am going to look at it more tonight when I get off work.
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my 97 f150 4.2L keeps stalling on acceleration. It ran fine this morning then my wife put 20 dollars of fuel in it and drove 30 miles to her destination with no problem. on her way back the truck started bucking bogging down and acting like there was a fuel problem but it didn't kill. I checked for codes there were none. I removed the fuel filter on the rail and replaced it with a new one. Now it will idle fine with no miss but if I give it gas it kills.
I checked the codes again there are none. I also checked to make sure there was fuel coming from the tank when I turned the key as well as making sure I heard the fuel pump kick on when I first turned the key.I am leaning towards water in the fuel,i didn't see any trash come out of the old filter, however I am not sure. I have a 175 mile commute to and from work.
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About a week ago my 1997 F150 4.6L 2WD starting a ticking noise. I had used high mileage full synthetic Mobil 1 and a Motorcraft oil filter for the previous oil change and yesterday had another oil change using regular Mobil 1 synthetic and a Motorcraft oil filter. Had never used high mileage oil before.
Since the high mileage oil is supposed to have extra cleaning agents in it to remove the sludge buildup in the engine, could the sludge have found its way into the oil pan and possibly clogged up the oil pickup tube? The ticking was not continuous and would be at idle or acceleration.
No rhyme or reason to when you would hear it. I also wonder about an exhaust manifold leak which could sound like ticking. If the problem is an oil pickup tube being clogged up, can the oil pan be removed with the engine still in the truck?
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I have a 2000 F-150 5.4 L. I was driving from home and seconds after the engine went into a rough idle that wouldn't let me accelerate. I scanned it and gave me multiple transmission trouble codes, about 15. I checked the wiring, the transmission fluid and it all looked good. So, what could be the problem?
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while trying to diagnose a check engine light. 2003 4.2 2WD Manual F-150. 135,000 miles.
Some background:
-I have changed the lower O2's fairly recently, but not the uppers
-Never changed MAF
-I checked for vacuum leaks in the last 18 months, none found
I pulled some freeze frame data after my hour long ride to work today, and this is what I have. Where I should go from here?? Truck seems to be running fine, but just "weak" when it comes to acceleration. There is smooth ideal and cruising. I am getting 20.2 mpg, mostly highway miles.
P0171
Fuelsys1 CL
Fuelsys2 --
Load Pct 87.5
ECT 188F
SHRTFT1 5.5%
LongFT1 28.9%
SHRTFT2 1.6%
LongFT2 28.1%
RPM 2115
VSS 50 mph
If there is other data you might need, I can pull it. I think I had a 0.01 lb/s reading on MAF when I did a separate test. That was likely at idle though.
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I am going to start from the beginning because oftens times we don't provide all of the information that may be pertinent to the correct diagnosis or repair. It'll be kind of lengthy! It all started about 3 days ago when my wife told me that my truck was "shaking." I said, "ok, just drive the car til' I can look at it" The next morning, the I was able to look at the truck. I had a cylinder 8 misfire detected. I drove it for about 1 hour that day to and from work. I did this so I could see what what the "shaking" was. It was actually what I describe as a "shudder."
Anyways, I done a fuel pressure check and all was well. I took of the coil, tested it, it was fine. So, I took out the plug to inspect it. It was wet! Not drinched, just mildly damp. I dried it off, cleaned it off with carb cleaner and it fired right up no hesitation no nothing. No CEL light, no shaking, no shuddering. It ran perfectly normal. I let it warm up to speed and took it for a test drive around about 6 city blocks. All was well. So I took it on the highway for about a 2 mile stretch. I was givin' her some juice pretty hard to see if it would misfire. Upon acceleration I heard a screech. Now this is where it get's interesting.
The screech that I hear, I just related it to the belt because it's done it ALL the time. When I first bought the truck it squalled like a whipped puppy cause of a cheap belt. The good ol' bar of soap trick fixed that! But, ever since then, it upon shifting, or under acceleration it would screech then stop. So anyways, on the highway run, it screeched while I was accelerating. It did this from about 60mph-80mph. I then, turned around and came back home. By the time I got to the stoplight to turn off towards my house my oil light was on and the engine was knocking. Not a tap, a knock.
I slowly coasted home not going over 20mph and pulling it out of drive as much as I could. I get home, and I check the oil and there is nothing on the dipstick! WTF!? I always run Mobil1 Full synthetic and put it 6qts. It doesn't smoke, doesn't leak or nothing! So I freaked out and went and bought 2 qts of Valvoline Hi-Mi and poured it in. It brought up the hash marks and quieted the deep knock. Later that night after work, I done a full oil change and flush and put back in my Mobil1 Fully synthetic 5w20. It now knocks at startup, and smooths out to a tic. Then at idle, it sounds like a light knock. It appears that it goes away upon acceleration.
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