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Author
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Topic: HELP!!!
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Scoop
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Member # 8726
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posted
 
 
I own a 93 fox it miss fires around 3500-4000 it carries rpm fine until it hits that rpm range. I swapped just everything mass air,computer,oxygen sensors,coil,spark plugs,spark plug cables,distributor,tfi modual,cap and rotor and checked timing.I changed just about everything the car sat for a year tank was emptied and has new fuel. The only thing I can think of is a dirty fuel filter. Fuel pump primes every time. Any input is appreciated just seeing if any one has had this issue.
[ April 02, 2009, 01:18 PM: Message edited by: scoop331 ]
Posts: 1121 | From: Out Chillin | Registered: Nov 2008
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Venomousnotch
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Member # 8695
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posted
You might wanna replace the fuel filter and check the oxygen sensors...
![[patriot]](graemlins/patriot.gif)
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🏁•2004 MUSTANG SVT COBRA•🏁
"WHEN THE WHINING STARTS,IT MEANS JUSTICE IS ABOUT TO BE SERVED"..
Posts: 7605 | From: *NORTHERN*KILLA4NIA* | Registered: Oct 2008
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rollin5ive0
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Member # 8592
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oh oh oh oh very important make sure the blinker fluid and ...yup thats right betcha aint ever checked your muffler bearings hahahahaha and that was the big my one and only shoti know it's alraedy toooo late for an april fools joke \but i dint get toplay one
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875.0gt
90dtlx5.0
93blkvenumos5.0COBRA#3377
96redthundr4.6l4vCOBRA
964.6l2vGT
895.0lGT
93cleancorlgreen5.0GT
93meancoralgreen5.0GT
Posts: 1830 | From: 707 vacaville ca | Registered: Aug 2008
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Scoop
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Member # 8726
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posted
quote:
Originally posted by rollin5ive0:
oh oh oh oh very important make sure the blinker fluid and ...yup thats right betcha aint ever checked your muffler bearings hahahahaha and that was the big my one and only shoti know it's alraedy toooo late for an april fools joke \but i dint get toplay one
that must be it! ![[Roll Eyes]](rolleyes.gif)
Posts: 1121 | From: Out Chillin | Registered: Nov 2008
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Scoop
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Member # 8726
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posted
quote:
Originally posted by Venomousnotch:
You might wanna replace the fuel filter and check the oxygen sensors...
yea i forgot to add o2's were changed
Posts: 1121 | From: Out Chillin | Registered: Nov 2008
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166 Merlo
FELONY
MOTORSPORTS
Member # 1549
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posted
sup scoop, what happens after 4k?
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'89 - Boss Coupe
'70 - Drop Cutthang
'68 - Cougnut
'87 - 0166, Its real
Posts: 3954 | From: Thebay | Registered: Jul 2002
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Scoop
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Member # 8726
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posted
I let off when it happens. But it miss fires and sometimes it backfires.
Posts: 1121 | From: Out Chillin | Registered: Nov 2008
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166 Merlo
FELONY
MOTORSPORTS
Member # 1549
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posted
start with the fuel filter bro, then if that still doesnt' work, run some fuel injector cleaner, then if that still doesnt' work, change the only two sensors u haven't changed yet, the ECT and ACT. Oh and make sure your grounds are solid, ur battery isn't in the trunk is it?
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'89 - Boss Coupe
'70 - Drop Cutthang
'68 - Cougnut
'87 - 0166, Its real
Posts: 3954 | From: Thebay | Registered: Jul 2002
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F.or O.nly R.eal D.rivers
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Member # 8971
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posted
You dont have a fuel pressure guage,the pump can still be working but not providing enough fuel pressure at that rpm?
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R.I.P MATT "4-Speed King"
Posts: 179 | From: RICHMOND,CA | Registered: Feb 2009
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Scoop
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Member # 8726
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posted
yea im going to check that today because i swapped the filter and it feels better now it does it right before 5000rpm.
Posts: 1121 | From: Out Chillin | Registered: Nov 2008
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Adam5.0
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Member # 6995
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posted
i would check the coil and get a scope on the tps and look for any dead spots.
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want something old and japanese
Posts: 1609 | From: Brentwood | Registered: Aug 2006
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Scoop
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Member # 8726
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posted
coil should be good its new. i already checked the tps and it was good. im going to check fuel pressure today
[ April 04, 2009, 03:47 PM: Message edited by: scoop331 ]
Posts: 1121 | From: Out Chillin | Registered: Nov 2008
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asskickn88
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Member # 4957
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posted
If you've got bad valve springs that could happen as well. The valves start floating, it backfires and misses. Are you running an aftermarket cam, rockers, high mileage on the heads or anything along those lines?
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Three 540 Bimmers and a 5.0 Explorer.... got a Ford back in the stable!
It's time for the country to do what Obama's own father did.
Abandon him.
Posts: 6069 | From: Rocklin, Ca | Registered: Oct 2004
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Scoop
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Member # 8726
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posted
Car is stock, millage isn't to high its at 109,xxx.
Posts: 1121 | From: Out Chillin | Registered: Nov 2008
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