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

70,205

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.

2 of 2 people found this helpful.
72,375

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 4,500
#2 Bob Beaman
Bob Beaman
Reputation 1,240
#3 COMETGUY61
COMETGUY61
Reputation 1,090
View All

Related Models For Sale

Used Chevrolet Camaro
377 Great Deals out of 31,274 listings starting at $2,500
Used Chevrolet Corvette
230 Great Deals out of 22,185 listings starting at $3,750
Used Ford Mustang SVT Cobra
5 Great Deals out of 215 listings starting at $5,500
Used Ford F-150
2,092 Great Deals out of 191,497 listings starting at $290
Used BMW 3 Series
1,002 Great Deals out of 31,465 listings starting at $1,000
Used Jeep Wrangler
282 Great Deals out of 15,777 listings starting at $3,795
Used Chevrolet Silverado 1500
1,938 Great Deals out of 182,796 listings starting at $999
Used Honda Civic
843 Great Deals out of 83,685 listings starting at $1,200
Used Honda Accord
1,055 Great Deals out of 66,824 listings starting at $1,000

Used Cars For Sale

2017 Ford Mustang For Sale
53 Great Deals out of 22,615 listings starting at $18,998
2016 Ford Mustang For Sale
207 Great Deals out of 4,304 listings starting at $15,391
2015 Ford Mustang For Sale
83 Great Deals out of 3,273 listings starting at $13,999
2014 Ford Mustang For Sale
60 Great Deals out of 3,067 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.