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Misfiring runs rough. Over 200,000 steady. 99 f150 5.4
Yes replaced spark plugs/coil packs, replaced main vacuum hose and 02 sensor bank 1 sensor 2 replaced and air filter … read more
Daniel Chaidez
Daniel Chaidez
Technician
Diploma
2,787 satisfied customers
2004 F150. XLT 5.4 - After replacing the spark plugs, it's
2004 F150. XLT 5.4 - After replacing the spark plugs, it's randomly misfiring. Spark plugs replacement went fine, but it's crazy now. Seems like multiple cylinders, changing at random. Pull the connec… read more
Nathanial
Nathanial
ASE Master technician
Automotive Technology Diploma
481 satisfied customers
Have 2002 F150 XLT 5.4. Replaced all plugs and coil packs &
Have 2002 F150 XLT 5.4. Replaced all plugs and coil packs & cylinder 2 is still misfiring. … read more
EricFromCT
EricFromCT
Auto Technician
5,573 satisfied customers
Last year our 2009 Ford F150 STX 4.6L 2wd w/ 106,000 miles
Last year our 2009 Ford F150 STX 4.6L 2wd w/ 106,000 miles on it and blew out the #2 cylinder coil pack and spark plug completely and I had the spark plug hole re-tapped due to the issue well at the t… read more
Scott
Scott
Diesel, Automatic trans, full line tech
Associate Degree
3,881 satisfied customers
Intermittant chugging at idle after warmed up and ran for 10
intermittant chugging at idle after warmed up and ran for 10 to 12 miles. stop and restart engine , the problem goes away. seems like misfire because revving the engine doesn't seem to help, only rest… read more
Mike
Mike
166 satisfied customers
Have a misfire on 5,6,7,8. Have replaced plugs an coil pack
Have a misfire on 5,6,7,8. Have replaced plugs an coil pack stil has misfire. … read more
davehop
davehop
Diagnostic Technician
Senior Master Ford Tech. Hyundai Master Technician
1,803 satisfied customers
2002 f150 5.4 ltr triton, code p0303 misfire, I had just
I had just repaired a p0306 code for my truck, replace were valve cover gaskets on banks 1 and 2, coil boos. t and coil on #6,. and manifold intake gasket upper and lower. After repair =13 miles total p0303 … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
10,878 satisfied customers
2007 f150 5.4 flex fuel cylinder 6 misfire have changed
2007 f150 5.4 flex fuel cylinder 6 misfire have changed plugs and coil packs … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
10,878 satisfied customers
Random misfire, Cylinder #2, 1999 f150 4ad 5.4, It is my
Just that I can fix most things on Chevrolet I had the same problem I changed the enjectour… read more
Expert
Expert
7,100 satisfied customers
Have a fail safe code on a 2007 f150 with a 5.4 in it I had
have a fail safe code on a 2007 f150 with a 5.4 in it I had to change the timing chains, phase gears, guides and the spark plugs had to be pulled. after putting everything back got a fail safe mode… read more
James
James
Bachelors degree automotive technology with minor in diesel
3,584 satisfied customers
F150: A friend brought over his 07 Ford F150, 5.4 L engine.
A friend brought over his 07 Ford F150, 5.4 L engine. Some time ago he changed out the spark plugs - but did not do cyl 4. So the other day as he was driving, the check engine light came on and starte… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
26,703 satisfied customers
im working on a 99 f150, 5.4. its a friends rig, has 3 codes in the co
im working on a 99 f150, 5.4. its a friends rig, has 3 codes in the computer, p0356, p1400, p0174. I can unplug all cylinders individually and have a change in idle, until unplugging #6. when I unplug… read more
roush665
roush665
148 satisfied customers
f150: hello I have a ford f150 2008 with a 5.4, and the check
hello I have a ford f150 2008 with a 5.4, and the check engine light is on , the codes are p0300,p0301 and 302. ok the truck only hesitate when you driving at 60mph are above, and the temperature in t… read more
Jon D
Jon D
45 satisfied customers
f150: I have a 2003 f150 with the 5.4 bi-fuel engine vin Z.
I have a 2003 f150 with the 5.4 bi-fuel engine vin Z. I have a misfire problem that moves around to different cylinders. I have replaced all the coils and plugs with new motorcraft coils and plugs abo… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
33,201 satisfied customers
F150 xlt: 2007 ford f150 dot 5.4 triton. 183,000 miles has
2007 ford f150 dot 5.4 triton. 183,000 miles has had dead miss since 80,000 miles. Have changed plugs and coil packs twice, same miss.have changed cam sensor & crank sensor, same miss. Now engine ligh… read more
Steve
Steve
Ford tech Specializing in electronics
Vocational, Technical or Trade School
6,755 satisfied customers
2004 f150: 5.4 Truck runs rough and the codes..miss fire..leaking
Got a 2004 f150 4x4 with 5.4 Truck runs rough and the codes are random miss fire. the truck was running lean and the intake gasket was leaking and replaced. Before the gasket was replaced it also had … read more
Bamaman39
Bamaman39
Ford master diesel Tech.Ford certified
High School or GED
2,287 satisfied customers
2000 ford ranger: 4.0l..rough..check engine light..codes come
I've got a 2000 ford ranger 4.0l. Truck will start to run real rough and eventually the check engine light will come on. I've had #3 & #4 misfire codes come up. Change plugs and truck runs fine for ab… read more
Anthony
Anthony
Master Automobile Technician
Vocational, Technical or Trade Scho
11,778 satisfied customers
1997 f150: it has a rough idle and..loose power..coil packs..egr
i have a 1997 f150 5.4 it has a rough idle and when at a steady speed it will loose power , when excelerating it feels like you have a load on it went to local mecanics told me to change coil packs ch… read more
Richard
Richard
ASE Certified Technician
Vocational, Technical or Trade Scho
1,552 satisfied customers
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Meet the Experts:

Ron

Ron

ASE Certified Technician

26,703 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

33,201 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

12 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Mike V.

Mike V.

Auto Service Technician

2,323 satisfied customers

25 years experience on all makes and models, Licensed NYS Inspector.

Richard

Richard

ASE Certified Technician

1,552 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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