I have a 2001 3.8 L mustang, it sat for about a year tried to start fuel pump out, ran great previously. Replaced fuel pump motor only, cleaned tank changed fuel filter and it ran great for about 60 miles. All of a sudden running rough misfires, knocks rough idle. Replaced all plugs, coil pack, EGR and 2 injectors (3-4)which showed misfire on diagnostic. First start idles great feels smooth after 15 minutes same conditions occur, sooner when driving. What should I test the fuel pressure again?

Asked by Nov 12, 2015 at 09:06 PM about the 2001 Ford Mustang Base Convertible

Question type: Maintenance & Repair

Car sat for a year had to replace fuel pump and filter ran great as it did
previously. After 60 miles started to idle very rough, misfire, knocks bogs down
when giving gas had to feather gas pedal to accelerate. Showed cyl 3-4 misfire   
changed 2 injectors, all plugs, coil pack, EGR. Idles smooth for about 10
minutes then idles rough, worse when driving same symptoms as above. Bad
fuel pump again?

2 Answers

61,045

Your fuel system may be all gummed up. Run some Seafoam in the gas tank and some Heet water remover as well. It may take a few tanks to clear up the problem.

1 of 1 people found this helpful.
69,895

Use the Red Heat bottle...it has isopropyle that would break down any water that may have collected from condensation.

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions

Search Ford Mustang Questions

Ford Mustang Experts

#1 Tom Demyan
Tom Demyan
Reputation 4,300
#2 Bob Beaman
Bob Beaman
Reputation 1,210
#3 COMETGUY61
COMETGUY61
Reputation 1,060
View All

Related Models For Sale

Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Chevrolet Corvette
119 Great Deals out of 20,753 listings starting at $3,000
Used Ford Mustang SVT Cobra
3 Great Deals out of 267 listings starting at $6,000
Used Ford F-150
2,194 Great Deals out of 206,316 listings starting at $1,499
Used BMW 3 Series
972 Great Deals out of 31,729 listings starting at $1,000
Used Jeep Wrangler
276 Great Deals out of 18,163 listings starting at $2,950
Used Chevrolet Silverado 1500
1,717 Great Deals out of 175,751 listings starting at $1,250
Used Honda Civic
657 Great Deals out of 88,604 listings starting at $995
Used BMW M3
45 Great Deals out of 1,517 listings starting at $5,800

Used Cars For Sale

2017 Ford Mustang For Sale
32 Great Deals out of 23,103 listings starting at $18,779
2016 Ford Mustang For Sale
158 Great Deals out of 5,276 listings starting at $16,991
2015 Ford Mustang For Sale
55 Great Deals out of 3,525 listings starting at $13,988
2014 Ford Mustang For Sale
51 Great Deals out of 3,152 listings starting at $9,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.