I have a 2002 f-150 4.6 that sometimes has a miss upon acceleration but not all the time.the truck is a 4.6 with a manual trans.has no engine codes and scanner never show a misfires but sometimes it does , have replaced all spark plugs and coil boots twice.
View 4 RepliesI have 2002 f150, fx4, ext cab, 110000miles 5.4 automatic truck, i just replaced my spark plugs, it still have a little miss, thought spark plugs will resolve but its the same, im wondering if i should change O2 sensors? clean EGR Valve? IAC valve? i am not getting good gas mileage and maybe its this missfire or something, its runs good without any problems, just this slight miss makes me think if its the cause to bad MPG.
I tried to find threads with pictures of how to change O2, how to clean EGR, and IAC, i remember seeing these threads but cant find em. And you think these three things will resolve my MPG and the slight miss?
My 2002 Ford F-150 4x4 4.6L 5speed strangely has a time delay in starting now. A delay in TIME and not the usually chucking along waiting to start. Or simply I turn the key and a second or two passes before anything starts to happen and it fires right up. Was wondering a few months ago, if my clutch sensor was going out but then it cleared up once I put a new battery in it although at the same time the weather warmed also. Bad connection somewhere, bad ignition switch, or bad clutch position sensor – I could go in each of these directions. Thought maybe the security in the key was doing it too but both keys have the same problem. No codes also.
View 2 RepliesMy truck won't down shift most of the time if I'm in 4wd especially I have to manually shift or stop let the rpms go to idle then it shifts down and I can take my foot off the brake and drive again not good when ur in deep mud and u start slowing down and can't bring rpms up...
View 14 RepliesMy 02 F150 4.6 has 84K miles on it, and started stumbling/hesitating during accellartion about three weeks ago. Before this problem started (about 2,000 miles ago), I installed a new fuel filter and air filter. Since I noticed the problem, I installed new plugs. The problem didn't go away, so today I checked the fuel pressure. At idle the pressure is 32psi with the vacuum line left on the fuel pressure regulator (30-45 is normal as per Chilton's), and 42 with the vacuum line off (40-50 is normal as per Chilton's). I also had someone else rev the engine so I could observe, and found that the fuel pressure went as low as 28 when the engine speed was quickly increased. The standing fuel line pressure is 30 (30 is normal as per Chilton's) Does this sound like a fuel pump problem, or is there something else that I'm missing.
View 10 RepliesI have a problem with a 2002 Mercury sable. At idle and under acceleration, it has a miss, it's worse when cold then improves when it's warm but never goes away and almost seems to come and go when driving. It's definitely worse going slow or idling. The check engine light is also on, I scanned the codes and it came up with 4 cylinders misfiring. codes were p0301 p0302 p0303 p0305 p0316 to be specific. I changed the spark plugs last weekend, how it ran at all is something I'll never understand they were so bad, obviously original with 150,000 miles on the engine.
It's a little better now but not much. Where I should look next? I've been told a lot of things but I can't keep throwing money at this, I'm unemployed so really the next major attempt is probably the last. Anything I should try? If it was carbureted with the old distributor I'd have this fixed in no time but fuel injection and computers, coil packs, all totally new to me. No white smoke out the exhaust, no funny noises just a miss and check engine light with only the codes above.
2003 6.0 is acting crazy again. Has new ICP, IPR, oil discharge tube, and hpop. It cranks right up but one time you crank it and all the gauges work correctly, especially the fuel gauge. The engine will idle perfect but when you accelerate it has a dead miss. May crank like that 2 to 4 times. Then you crank it and it runs like crap, and the gauges won't work, the fuel gauge goes past E and the light comes on. As long as that happens it runs terrible, but when the gauges are working it idles great but has a miss under acceleration! It was running fine, then just went nuts!
View 4 Repliesit's missing at an idle and it acts like it dont wanna take gas but once you get it going on the road it does good. the motor is a remanufacture motor it's only got 6,000 miles, new coils, plugs and wires, cam sensor, crank sensor, idle air control, mass air flow,and temp switch.
View 9 RepliesSo today, I planned on switching the belt, idler pulley and tensioner since at least two of them are making noises. After taking all of the stuff off, belt, idler pulley and tensioner... and since I always compare parts I buy to parts that were in, making sure they are identical and I didn't order the wrong one. So first up I checked my tensioner and the position of them or angles are different, completely different.
So Google it to view a few diagrams and bang! it hits me... the one I took out from my F150 is for a non-AC... so back into the truck and I'm looking. Didn't have to go far when I realized that my AC compressor is missing!!!!
I keep looking around and I see that yes, I did have AC in it before I got it; because the guts are there but sliced! Great, so the job went from easy and easy I mean buy compressor and install; but now since the guts were cut, the PO sliced the thing out simply put.
1.) What are the bolt sizes that hold the compressor in place?
2.) Is there a wire connector on the compressor? or no?
I have a99 5.4 and its missing slightly when cold mostly. I'm thinking egr poss did tune up 7 mos ago so I don't think it's plugs or coil pacs seems to get better when it warms up...
View 11 RepliesMy 4.2 liter F150 suddenly started missing under load. A little background: It is a late 2003 and has 75k miles. It has been in my family since new, and I have had it for the last 4 years. This truck is as stock as they come, and has been well maintained.
On my way to work yesterday, it began missing. Not bad at first, but got worse. It misses while under load and under acceleration. The "check engine light" never came on. I have not put fuel in in several days, and it ran fine until now, so I doubt it is bad fuel. I started the engine after dark and looked for arcing. None visible, and I even sprayed the wires with a mist of water. I pulled the plugs and they all look normal. The gaps were all way too large, so I regapped the plugs to .054". I pulled the coil pack and it checks within range with my VOM. Can the coil pack be the problem even though it checks out on the bench? Can the large plug gaps have contributed to a coil pack failure?
Where to start. I HATE just throwing parts at this thing, and I don't like wasting money... If I let one of the auto parts stores run a scan, will it show a code even though I have no check engine light? I used to think of myself as a pretty good diagnostician, but then again, when I used to spend a lot of time under the hood, those cars had points, condensers and carburetors...
I have a 2002 7.3l with 229k miles. So I am having a big problem now missing oil! My reservoir is empty and my dip stick is reading low, and i just put 16 quarts in yesterday with the new filter! im having a long start issue obviously because i don't have any oil supply! just drove the truck today, ran great been having this issue for the past week. here are the details. i came up from Texas after installing joeys t500 pump, when i arrived to California there was oil everywhere! my pump that joey rebuilt had an issue so he sent me another and bam! runs great no probs, now after about to weeks and about 15 degree temp drop i get hard starting. first time instead of a 2 second start up it took 9 seconds, now it takes anywhere from 9-20 seconds to start! so after my drive today i let it sit for about 3 hours seeing if maybe i had air in the lines from the res not being full, well now i cant get a start at all my res is empty and my dipstick shows little oil, i just replaced the icp. ipr, and eot when i put the first pump in, could this be the lpop?
View 14 RepliesHave a p0401 code which I need to diagnose and solve. However, I don't believe the symptoms are indicative of the EGR system. Its a 1999 4.6L auto approximately 200k miles. Truck runs fine until it warms up, and then occasionally it begins to act like its missing under load. steady state on the freeway it may have an occasional miss, but put a load on the motor and the miss becomes real bad. This doesn't seem to me to be symptomatic of a P0401 code, but I don't really understand the EGR system enough to be sure. Searching on the forums for other p0401 codes doesn't seem to have the same symptoms.
View 10 RepliesI recently purchased a 1997 F150 4.2 Liter. On the way home it started missing. Within the next few days it died on the side of the road. After towing home I found no spark. A few days later I t started but only for a few minuites and died. No spark, coil pack is new so I replaced the CKP and it started up. Drove it about 1/2 Mile and died again, No spark again. Not getting power to coil pack when I am turning it over. So in short, new coil pack and CKP sensor and no spark. If it sits for a few days it may start or it may not. But if it does it only runs for a short period and then no spark again.
View 3 RepliesI have a 2001 F150with the V6 motor, automatic transmission and 73k miles. It has begun having hesitation/missing problems at low rpm, 1000-1800 or so, and it feels like the engine shuts off for a fraction of a second. At idle and above that range it seems to run fine. Also, it only happens in Drive and when the engine is fully warned up - it does not do it when cold or in Neutral. Uphill, downhill, doesn't matter. There are no OBD codes. The spark plugs, air filter and MAF sensor have been replaced recently. I have OBD scantool on my laptop, but have not been able to use it yet.
View 1 RepliesThis a 02 with 5.4, had codes po306, pulled and checked sparkplug had moisture in it. Fixed that ran ok for a little bit then started again, no codes now and smells a little like rotten egg.
View 1 RepliesI was looking at my exhaust manifold..and I found a couple of studs missing...so if I want to replace both of them , is it better if I replace all of them on both sides of the engine ?
By the way..my exhaust manifold is good I don't think none of the studs are broken.. but I have been having this engine knocking noise on my engine, do yall think a couple of studs could be the problem of why my engine is knocking?
I've got a 97 f150 4.6 that has randomly started missing over the last month. It has started to get more frequent and codes are showing a misfire on both cylinder 1 and 8. Both of these cylinders run off the same coil pack. I'm thinking its the coil? The plugs and wires, motocraft, have about 3k on them and the truck runs great otherwise. I just don't know how common a coil would cause this or if they would act intermittent like this.
View 5 RepliesHave a problem with starting. Truck had an alarm system that I took off. Reconnected the wires back to factory. Installed a new battery-starter cable. Checked and had no radio and no power windows. Found two relays missing and one fuse under the hood missing. Installed new. Tried again and have all accessories but will do nothing when turning key to start. With key on I can jump across solenoid by starter and it will start. Once started it will not allow me to shift out of park. If I shut truck off and turn key to on position I can shift out of park and into neutral and jump across solenoid and it runs. Once I shift back into park it kills the truck and we start all over again. I've traced wires and fuses and can't find anything. 2000 f150 xlt 4x4 5.4l....
View 3 RepliesI have a 2000 E350 boxtruck with a 5.4 auto. The motor is a new rebuilt with about 4000 mile, coils were replaced with motor, injectors were rebuilt with motor.Today (500 miles from home) the truck died. I was going up a slight hill on an interstate. It will still start, but runs very rough and when I put it in gear and step on the gas it dies.
So I had it towed to a garage. While pushing it into the garage I noticed my gas cap was missing. I know it was on 45 min earlier because I got gas. Did I forget to put in back on? probably.. But I wondering if the missing gas cap could cause the truck to run bad,vary bad?
I have an 1999 f150 4.2l only 82,000 original miles.i have had truck since new .i just replaced the spark plugs for the first time.i used autolite plat. I also changed fuel filter the truck started to run like crap now shaking and sorta like missing.i pulled the plugs again rechecked the gp reinstalled them installed new wires still runs like crap.went out bought new motorcraft plat. plugs gapped at .054 still runs like crap..so i checked the gap on original plus that have been i the truck since new the gap on them are .074-.075. should i try and gapp the new ones to this the truck ran like a dream with the original plugs at this gap????
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