Ford F-150 - 1997-2003 :: Slight Misfire / Hesitation And Possible Backfire
Jun 16, 2016
I have a 2001 f150 5.4 with 200,900 miles. Just bought the truck about six months ago off my dad when he got a new one. I am now experiencing what seems to be a slight misfire. With the hood up pulling the throttle around 2200 rpm starts making a loud knock. Above that rpm nothing and below that nothing. Standing by the tailpipe it sounds like a small backfire. It Idles really rough and when you get that sound out of the tailpipe it jumps like its hiccuping. And tailpipe is vibrating quite a bit.
Things I have done in the past month include replacing the pcv valve, changing spark plugs, cleaning throttle body, cleaning MAF, took down exhaust to check cats because i was experiencing a power loss and bogging. When the exhaust was off i punched the two rear cats. I ran a bottle of iso heat in the gas. Everything seems to have supported the power problem but now less than a week later i am starting to experience the knock and backfire type sounds.
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I have a 2003 screw 4x2 with the 4.6, 148,000 miles, and I'm not sure what kind of transmission. Recently when the truck would shift into second it would hesitate and I would feel a slight grind, but it only did it when it would shift at 2000 rpm, if it shifted at 2500 rpm it would shift fine. I checked the fluid level, it was full, it smelled okay, looked *fine.
After pulling a boat (19 foot bass boat...nothing too heavy) it started to shake violently when I'd take off from a red light. So I dropped the pan and changed the filter, The fluid was dark red and smelled a little burnt. I put 4qts of fluid in it along with some Lucas transmission fix. The shake during take off is gone, and the grinding while shifting into second got a lot better but didn't go away completely.
However, now the grinding into second has has gotten worse again, and if I make a right turn from a red light it grinds and feels like its slipping until it shifts. I am not sure why making a right turn would affect it but its definitely worse when i turn right, left turns are fine. I'm guessing my transmission is going out and I just need to get it rebuilt...
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I have a 1998 f150 w/ the 4.6L V8
For months I have had a hesitation in this truck when i go to accelerate, and at times you can even feel a little buck with the cruise set at 70MPH. It has gotten worse and worse. When i start pulling a trailer good luck, it will do it but its terrible, hesitations and misfiring,
There is always a misfire/hesitation. Will Idle nice After its warmed up. Sat for 2 weeks fired it up and it had a HORRIBLE idle for at least 1-2 min. This is new now it wont idle when cold. Now I had one code Cylinder 4 misfire, cleared the code never came back 2-3k miles later still not back on -
replaced coil packs
New plugs
New wires
Fuel pressure test good
Checked the Heater hose - not leaking and nothing in the hole.
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2003 F150 5.4 72852 miles
I have a Rough Idle & sometimes a hesitation or stumble on acceleration. I cleaned the MAF & IAC motor & Air & Fuel Filters are new. I got a 20890 scanner & ran test 6 53 as suggested in many posts by BlueGrass. Here are My results & what They Convert to.
1 00F5 .3675
2 0051 .1215
3 0000
4 0000
5 00A3 .2445
6 0000
7 0000
8 0000
I'm guessing the cop's are ok & probably need plugs? I was hoping to just swap a coil. Too cold to do plugs & truck won't fit in my garage.
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I will add as many details as possible :
2000 f150 4x4 offroad package
5.4L with 131k on it
new Dorman intake manifold
new Global Automotive (Ebay) COPs
New Motorcraft spark plugs
About 1500 miles ago I started throwing a code signifying a cylinder 3 misfire. The truck would bog down real bad and then after 5-6 seconds of no power it would return to normal. I tried replacing the COP (both with new and then with one from another cylinder) and plugs but no resolution. So I talked to the local ford service manager and he said it sounded like intake manifold problems.
Replaced the intake manifold and no more codes were being thrown.
1500 miles later and today the truck started having a hesitation/shudder when I was sitting in a drive-thru. I put the truck in neutral and park and neither solved the issue. With the earlier issue, when I would put in neutral and increased rpm, the issue would resolve.
I pulled out of the drive-thru and the hesitation was consistent no matter what the rpm or speed. The truck feels almost sluggish and lacks power. The hesitation is like 2x/second. When accelerating its almost like the rpms and speed hesitate, jump, hesitate, jump.
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I have a 97 F150 4.6. The truck has developed a slight stumble/misfire when under acceleration. Once at speed it runs fine. It has not given any codes. I've checked for them several times. The plugs and wires have been changed. Is it possible that a coil pack could be bad without throwing a code?
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1991, F-250, automatic, 150,000 miles, two tanks. Used mostly for towing an RV plus some pleasure. Not in daily use. A month ago I parked it and a few days later cranked it up and found it wouldn't run over thirty MPH. There was some high pitched backfire in the engine compartment and the trans. wouldn't shift. I parked it and the next day it wouldn't start. When I turned the key on the fuel pumps (either tank) ran continuously. Towed to a garage (I am not a Mechanic). They have replaced the fuel pressure control, checked all pressures and it still won't run right. The problem is intermittent. My tranny man said the trans was good. My mechanics don't know what to do. I bought it in 1998.
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I have a '97 Toyota Tacoma, two-wheel drive. It has 154,000 miles on it. During the last three weeks, there's been a hesitation/ stumbling sensation happening occasionally in the first three gears. It doesn't happen in 4th or on the freeway. At first, I thought it felt more like a "slipping", like a clutch going bad (since I still have the original clutch).
I had my mechanic check it out, and it's fine. Here's a brief history of recent work done. Three months ago: injectors removed and cleaned out on a special machine. I replaced the cap & rotor and spark plugs. The wires were replaced last year. I replaced the fuel filter and PCV valve. I cleaned out and replenished my K&N air filter. Last week, I checked the connections where the spark plug wires connect to the cap. They seem fine.
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My R just started doing this under heavy acceleration for the past few days, I used to get a back fire pop during some hard shifts between gears but now it's doing under WOT.
Basically let say. I am cruising in 4th gear, if I drop down to 3rd and mash the pedal through the gear the car hesitates and pops a few times. It doesn't do it all the time but it's coming to a point where I'm concerned. Is this normal or should I have it checked out.
Mods are in sig, I'm still on the original spark plugs at 42k miles, that is going to be my first plan of attack. What it may be?
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Last night I bought 2000 F250, 346k on it... Crew cab short bed 4x4 with ranch hand bumpers like I wanted .... Headed back home (Miami FL ~1100mi) and covered about 200 miles @70-75mph before i ran into few problems ....
First off, while cruising I noticed slight hesitation in the throttle, with loss of speed regardless of pedal pressure, noticeable on inclines. It would go away on downhill and get smooth response again and pick up speed. This went on for about 40 miles.
Then I noticed heater blower stop blowing hot and start blowing cold, without me changing any settings. At the same moment, I noticed temp gauge move up and I hit next exit offramp to check what's up. During right turn at the end of off ramp truck stalled. Pulled to the shoulder, and popped hood.
Noticed empty degass/overflow bottle. Carefully opened lid and water gushed up to the top. When all pressure slowly released, water pulled down and emptied the bottle. Both upper and lower radiator hoses are empty. Engine oil has no traces of water tho. There were no leaks under the truck. I then tried to fire up the truck to get me to the gas station 1/8th mile away.
No crank in Park. WTS comes on and goes off. Cranks in Neutral, RPMs come up some, oil pressure shoots up to normal running position, but won't fire. Tried a while then gave up as not to kill starter and batteries completely.
Fuel pump works 20 sec then shuts off. There is fuel in bowl. I covered 140 miles since last full fill up, so not fuel pickup issue I don't think.
Summary
Have crank
Have RPM
Have oil pressure
Have fuel
Have (had) batteries, now not so hot
It's cold out ....
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For some time I have known the coils are going bad and cause occasional misfires but recently something new is added. Backfires and balking down to not moving. codes were po307 po300po430. the reader tells me the likely cause would be the vct solenoids. Also they offer a set of 8 coils at autozone with lifetime guarantee. Are these any good? I have read on here to beware of cheep coils. 2006 f150 5.4 miles is 119,000 have not changed spark plugs yet.
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(2000 F-350, 7.3L, 205k miles) Over this weekend, I noticed while driving mostly in the lower gears, that there was a slight hesitation with the throttle pedal depressed about half way or less. Seem to get worse as the day went by, but no lights or anything came on. Changed the fuel filter and added a fuel injection cleaner to the tank. Checked the oil and it was low, so I filled it to the correct amount.
Drove it around the next day, and it seemed to be good, until it warmed up some, and continued to hesitate. The hesitation seems as if it's not getting constant fuel, and the truck jerks a little. Once you get up to over 2000 rpms, it goes away. Looking up other reviews on similar issues, most have pointed to the throttle pedal sensor and just changed out the pedal assembly. Before I take it that far, I wanted to see what was the corrective action.
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Over the past few months my '13 350 occasionally seems to hesitate when starting from a light, in a parking spot, in general no/low speed maneuvers. It doesn't do it every time, and it's not a hesitation with engine bucking, backfire, or noise. It just feels like the power takes a few seconds to come on when I hit the pedal. Sometimes. It has been interesting a few times on highway on-ramps...
At first I thought it was my accelerator technique, using the wrong foot angle, but I've been careful to apply the pedal correctly. Since it doesn't feel like the classic engine miss I was wondering if there are any other things to consider, such as transmission (hopefully a software update or something else simple) or anything else.
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I have a 2010 with about 166k miles. I am getting a slight hesitation at slight acceleration or constant speed. It does not matter if it's on highway or freeway speeds. Now I am not sure if this in junction with me changing the PCV valve, cleaning the EGR pipe, or cleaning the TB for carbon recently. It started happening a week after it though.
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I have a 2001 oldsmobile aurora 78,000 miles on original motor. the car misfires , backfires underhood,and excessive gas consumption, also sounds terrible at the rear exhaust. 3.5l motor issue stated after i filled up at cheap gas station.
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2003 Ford F150 XLT - Truck hesitates (or bucks) as the throttle is pressed. Not from a stop though. It starts / runs fine, but no matter how how fast, what gear, hot or cold, it feels like the fuel cuts out for 1/2 second. Also it is not a specific point in the throttle motion. It does it when it is halfway, 3/4 or fully depressed, but is not consistent. It does happen more frequently now than two weeks ago. I am not getting a check engine light.
4.6L V8, 5 Speed Manual 4x4, 74000 mi
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Recently purchased a 2000 ford f150 4.2l. started hesitating when i would try to accelerated stressed or when a.c on. if i drive it like a grandpa wont do it. filled up the gas tank and it completely went away. the second it went down to the 3/4 line, started hesitating again. mind you when it was full even with the a.c on and going 80mph on expressway it would not hesitate.
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97 f150 4.6 4x4, no check engine light, no missing or sputtering, however when I try to get going I can't get passed 2500 rpm and when it finally does its still kind of sluggish and can't pass as easy. Changed fuel filter. It idles fine and when I put it in neutral it will go up to 5000 rpm if I want.
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Just bought a 1998 5.4l F-150 Lariat. 136,000 miles.
Question about the overdrive button on trans handle. When I push the button, I don't see any light turn on (or off) and I don't feel any change in the gear ratio or increase/decrease in rpm's. I assume since the button in there marked "overdrive" that the vehicle in fact was equipped with it. Could it be a bad button, fuse, or ?
Also, it just started the shudder/hesitation at certain speeds that I see a lot on these threads. Seems like that is a coil issue as the description in many threads is exactly what I am experiencing to incl the rotten egg/fuel odor. However, it started the same day (not same time, later same day) I decided to push the overdrive button while checking out all the things on the truck.
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I 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.
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I haven't really gotten under it to check this out, but my truck (see signature) has a slight vibration on take off. It only does it when the wheels are turned to the right or left. They don't have to be turned very far either. It doesn't do it on straight line take offs, or on a take off from a rolling stop. ONLY when pulling off from a dead stop and the front wheels are turned any degree to the right or left. I'm running mostly bald all terrain tires, the wheels are not bent. My current wheels are new to the truck, and the problem was there with the previous rim/tire combination. The rear end doesn't seem to have any slack in it. The transmission shifts like a top. There are no other clanks or vibrations anywhere in the drivetrain and it drives good.
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