Erratic sputter/misfire through all gears...

DSkeet · 06-24-2008, 06:43 PM

On my 5.0 fox when under normal accel I get an erratic sputter through all the gears and when in 5th cruising at 65-75 etc. It seems to go away as I press the gas harder and open it up more. Any ideas? I have checked plugs, changed the distributor(thanks for the dist matt), checked firing order on the wires etc. Could it be in vaccum somewhere? Could my fuel filter be clogged? Any help is greatly appreciated. I just need to know where to look...
Thanks
Dave

Italian LX · 06-24-2008, 06:48 PM

What MAF are you running?

coupe · 06-24-2008, 07:04 PM

Coil, cap/rotor, plugs. Sounds like it's in that department.

EHardy1971 · 06-24-2008, 07:19 PM

My money is on the TFI module.

militarymustang88gt · 06-24-2008, 07:47 PM

i say the vacume came off the FPR or there isnt a good ground for the motor.

banditmwp · 06-24-2008, 08:50 PM

Is the distributor tightened down all the way? Also, I know that distributor had a stripped screw at the cap adaptor, but I didn't have any problems like that when I was running it.

DSkeet · 06-25-2008, 06:02 AM

Quote:

Originally Posted by banditmwp

Is the distributor tightened down all the way? Also, I know that distributor had a stripped screw at the cap adaptor, but I didn't have any problems like that when I was running it.

Yeah it's tightened down all the way. Hopefully I will have time this weekend to look at it more. It just gets old and I know my gas mileage probably sucks because of it. I'm gonna put some diff plugs in and then check into some of the things you guys mentioned...Brian, not sure what MAF it has but I guess I could check that as well...Thanks guys, I will post back and let ya'll know what happens...
Dave

04 Mach1 · 06-25-2008, 07:19 PM

what's the timing set at?

DSkeet · 06-26-2008, 08:01 AM

Quote:

Originally Posted by 04 Mach1

what's the timing set at?

You're gonna have to ask Scott on that one buddy...Wish I knew! How are you doing? I hear you had quite a rockcrawling adventure on dump...

Craig K. · 06-26-2008, 08:03 PM

I am assuming no codes or check engine lights?
Can you do a Key On Engine Off test?

I had a similiar condition when one of my O2's went out, but I did get a code and a CEL

06-24-2008, 06:43 PM	#1
DSkeet IDK Join Date: Dec 2004 Location: Jacksonville, AL Posts: 1,136	Erratic sputter/misfire through all gears... On my 5.0 fox when under normal accel I get an erratic sputter through all the gears and when in 5th cruising at 65-75 etc. It seems to go away as I press the gas harder and open it up more. Any ideas? I have checked plugs, changed the distributor(thanks for the dist matt), checked firing order on the wires etc. Could it be in vaccum somewhere? Could my fuel filter be clogged? Any help is greatly appreciated. I just need to know where to look... Thanks Dave __________________ --2005 Chevrolet Corvette C6 Z51-- --2007 Lexus GS350 AWD-- --1958 Plymouth Belvedere aka "Christine"--

06-24-2008, 06:48 PM	#2
Italian LX Daddy x4 ...we're done Join Date: Dec 2004 Location: Oxford, AL Posts: 11,551	What MAF are you running? __________________ -Brian '86 Mustang GT Convertible '88 Mustang LX coupe '11 Odyssey TE '21 Insight Touring

06-24-2008, 07:04 PM	#3
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Coil, cap/rotor, plugs. Sounds like it's in that department. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

06-24-2008, 07:19 PM	#4
EHardy1971 Trunk Monkey Join Date: Jun 2007 Location: Home Posts: 5,708	My money is on the TFI module. __________________ Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS

06-24-2008, 07:47 PM	#5
militarymustang88gt Senior Member Join Date: Jun 2007 Location: bham and auburn Posts: 337	i say the vacume came off the FPR or there isnt a good ground for the motor. __________________ finally got my avatar. it is the white one.

06-24-2008, 08:50 PM	#6
banditmwp Welcome to America! Join Date: Dec 2004 Location: in the 11's Posts: 4,501	Is the distributor tightened down all the way? Also, I know that distributor had a stripped screw at the cap adaptor, but I didn't have any problems like that when I was running it. __________________ 91 GT Convertible 2006 Nissan Titan LE Crew Cab 2014 Peterbilt 337/Marion 22' box

06-25-2008, 07:19 PM	#8
04 Mach1 Bet I red light B4U Join Date: Aug 2005 Location: ANNISTON, AL Posts: 975	what's the timing set at? __________________ 89 gt 2.3 stroked holley head with n12n port high flow intake with great big fart can skunk 2 seat belts with kool glow water squirters and new light up shift knob basically everything from wal-mart art carr C4 10.53@127.3 w/ 1.53 60' 89 gt vert 347 eldebrock heads and intake AOD w/3000 stall unknown with 5spd went 12.7 on steet tires 04 Mach1 automatic flowmaster K+N drop in 13.9

06-26-2008, 08:03 PM	#10
Craig K. Nothing new here Join Date: Dec 2004 Location: Senoia, GA Posts: 2,990	I am assuming no codes or check engine lights? Can you do a Key On Engine Off test? I had a similiar condition when one of my O2's went out, but I did get a code and a CEL __________________ 1974 Triumph TR6 1985 Monte Carlo SS 1986 Mustang GT 2011 KIA Optima GTS