1997 F-150 190K miles recently started stuttering and occasional backfire. feels like it's trying to shift but can't. I feel like I need to stomp the gas. I'm thinking plugs, wires, or coils....
View 3 RepliesFor 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.
View 10 Replies1.6 FSI .. Very long story short, the engine is running like crap, idle is jumping up and down. Almost no power, its stuttering and so on and so on. Well I talked to a mechanic and he found out the problem, a throttle vacuum. (kinda like choke) he explained it as.
The part was ordered, and arrived. Me and my dad tried changing it and we met some struggles. After looking at it closely and trying different things we kinda gave up.
Here is the part that is broken, it adjusts the amount of fuel when its cold vs. hot
We concluded we needed to take the whole intake to access it ?
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.
Vehicle: 1998 F150, 158k mi. MT (M5OD), 4.9l I-6.
Description of problem: About 2 weeks/500 miles ago, truck developed a scraping/squeaking sound. I thought maybe something was rubbing on the driveshaft, but inspection revealed no likely candidate, nor disturbed metal on the shaft.
Over the course of the next 500 miles, it's gotten worse, so that current symptoms exhibit themselves (to one degree or another) 80% of the time. The symptoms are:
- Worst on first drive of day, on first mile.
- Sound produced somewhere between scrape and squeak.
- Vibration noticed throughout cab and through steering wheel ONLY when foot off clutch...smooth as soon as clutch depressed.
- Giving it a little gas (at constant speed) usually smooths out symptoms somewhat.
- Recently had bed loaded to gross. Vibrations went away, to return once bed empty.
- MT fluid found to be full, in good condition, and with 15k mi since change.
So, what's up? Given that a load in the bed improves things, I was thinking U-joints: but the driveshaft spins in neutral, too, so why would pressing the clutch change anything? I also thought about tired clutch bearings, but everything I've read says pressing the clutch makes things worse, not better.
Is it worth examining the tranny-to-engine bolts?
My husband's 04 F150 has an occasional ticking/clicking sound that comes from the right rear tire. It occurs in both drive and reverse, while braking or while driving and will stop with braking. We cannot establish a pattern. Brakes are good, we just checked them and they do not need to be replaced. We took it in to be evaluated, of course it did not make the clicking while they had it and they did not see anything to indicate an issue.
View 3 RepliesI have a 79 ford and a 400 engine that i put a 1411 on and it backfires when you hit the gas it is worse when you drive it then when it is just sitting there.
View 4 RepliesI own a 2008 Bullitt Mustang. The past six months I have noticed a backfire. It only happens after the car has been driven and cools down for a few hours. It doesn't happen after sitting all night. The car is under warranty and my dealer says it is normal. The car also runs better when it is cold.
View 8 RepliesTruck is a 74 250 390/auto tran. 2wd. When I am at a stop and then step on the gas (not hard) it will sometimes backfire then die. Then I can start it up and it'll run fine. The only other times it backfires is if I am doing about 40 or higher, take my foot off the gas, and let it coast down to around 33mph or so then step on the gas it'll backfire once and run fine. If I am at a dead stop and punch it it will also do some backfiring, usually killing it.
Other than these times it runs fine. I've adjusted the carb (I know not correctly) and that does work if I set the idle higher. Is it possible my fuel pump is going bad? I was always told a mechanical fuel pump pretty much either works or doesn't. If it is a possible pump problem should I test it or just replace it...
My 302, only mod is a 4160 600cfm and i love it. But when I kinda baby the throttle and the secondaries flop down to let fuel it... There is a massive lag time. Sometime it will even backfire! fronts have 59's (could be slightly richer) and the back has a 134-39 metering plate and a black spring. it seems that it needs another shot from an accelerator pump to keep going. I raised the float with the same result, how to cure that lag time without mashing the throttle.
View 14 RepliesNeed proper information so I can repair whatever the heck is messed up on my '02 V10 4WD.
Periodically while driving (usually at lower speeds <50 mph) I feel a "Stuttering" in the steering wheel. It feels like the steering wants to swerve left or right for a brief second with no warning. This occurs to greater or lesser extent but so far not terribly and not so I loose control of the truck.
Although I haven't experienced this on the highway I do feel a slight tug now and then in either direction.
My local shop has verified that all of the ball joints have been replaced/greased and everything appears to be aligned and in good operating condition.
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.
I have a 2006 ford f 150 with a 5.4 Triton 3v engine and every time I floor it and the engine reaches 3000 rpms the truck backfires and looses power. Sometimes it wont pass 3000 rpm it just stays there and backfire and have no power. Sometimes the check engine light flashes...... I took the coils off and looked at them and they all looked pretty clean. Also the truck idles rough and sometimes when it cruising at low rpms, and I give it a little gas the truck will randomly misfire and shake hard. also the engine sounds like a diesel engine........ What might be wrong.
View 6 RepliesMy 98 explorer is hiccuping when i am stopped for more than a few seconds and when I press the gas to get going it stutters. It only does this if I am stopped at a light or stop sign for a few minutes. Once I get going again it runs fine. The check engine light is not on and I have replaced the o2 sensors and spark plugs. I am at a loss on what to do next.
View 6 RepliesMy wife and I have a 2004 F-150 5.4 L SCrew 2WD which is stuttering sporadically when we drive it. It will run fine and then suddenly when you increase pressure on the peddle, it will occasionally (one or twice per 30 min or more trip) hesitate. At first I was thinking it was a fuel problem, and now I am inclined to think it is a transmission problem. It causes jerking (feeling of loss of power) and then quickly goes away.
No codes show up in the computer and no lights come on in the dash. Miraculously when service drives it at the local dealer, they state that they don't find anything. We also feel the truck shifts hard since the last PCM update (the dealer states that it has the most recent PCM update). The condition has worsened and we are nearing our original MFW expiration at 36,000. We did purchase the prem extended warranty however. We recently talked the service manager into putting the in-flight computer in it, and I need to take it back today or tomorrow to have it removed.
On the way home today upon medium acceleration I heard a pop kinda like a backfire ......now black smoke pours out on acceleration.no much in line of power either. Hoping I haven't screwed the motor ...
6.0 ltr turbo diesel 2004 f-350 super duty crew cab 4x4 ....
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.
Started my truck this morning. 2000 F350, V10, 153000 on the clock. Immediately sounded like a shotgun went off under the hood, now it sounds like it's running a cutoff exhaust. Had a tiny manifold tick prior to this, but can it backfire hard enough to crack/destroy the manifold?
View 5 RepliesI have a 2003 f150 that has a history of misfiring on one side. It started with a misfire on #1, then #4, and finally #2. I replaced all 8 plugs last year and each COP as it gave the misfire code over the course of the last 3 years. My latest run in was with #2, and I replaced the COP today and took it for a test drive. It was running pretty rough at idle, which I assumed was from disconnecting the battery, but then the stuttering started but it felt a little different than the standard misfire that usually didnt pop up until 40-50mph.
This stutter was more constant, and it also let up when I would coast. I only took it for a 4-6mile test drive and toward the end, the "Service Engine Soon" light started blinking and then went off by the time I got home. I parked it and noticed quite a lot of crackling noises that seemed more than normal, but it was a hot day and I was pissed that I didnt fix it so I cant say for certain if it was out of the norm or not, but it seemed louder and more frequent. Then I got to worrying about my cats going bad.
So, my questions are:
Could I have done something wrong when changing the COP?
What can the flashing "Service Engine Soon" light mean? Ive only seen a solid one before.
Should I be worried about the cat going bad since all the issues have been on that one side?
What should I do next?
Have a problem with a stutter when I press the accelerator while going up hill. I even had this problem driving on a flat road but that was a 1 time thing and happens every time I go up hill. Had a coil replaced that came off of an '04 because one of mine went bad which caused it to shake whenever I came to a stop. Wondering if the coil has anything to do with it... 2007 5.4L ....
View 1 Replies1991, 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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