My car has a bucking type feeling ONLY between 40-60 mph in OD. All my COP seem fine, plugs are good. I checked my TPS and its working porperly. Its only when the car is at part throtle or costing, under load its fine. Any Ideas????????????
My car has a bucking type feeling ONLY between 40-60 mph in OD. All my COP seem fine, plugs are good. I checked my TPS and its working porperly. Its only when the car is at part throtle or costing, under load its fine. Any Ideas????????????
#1724 of 3214 Built 02/13/2004
2004 Marauder black/moonroof
SCT flip chip, 4:10's, lowered, big brake kit
Kenwood KDC-X790 & 4 Kenwood speakers, 10" Sub
Addco tube sway bars & performance shocks, Metco's
Zex dry nitrous kit, Full SW Exhaust Kit, PI 3000 Stall
5.0L Stroker assembly, Self installed!
E.T. on drag radial tires: 12.270 @ 111.16 & 1.66 60'
One off custom Hood all steel too.
SOON TO BE Vortech supercharged
Ryan Schmuki
2003 Marauder, black with 4.10s n tune (sold)
1968 Fairlane 347 built stroker(fast)
1963 Galaxie 390 auto
2010 Mercury Milan
2019 Taurus Limited
Did you have the car tuned after the new engine was installed?
Did you have your kit balanced prior to assembly.
All 4.6 modular motors are internally balanced. The 3.75" stroker crank is considered a 5.0L (301cid with .020 over bore) and requires balancing. Most machine shops and engine builders have dynamic balancing as an option. But to Mustang & Fords, dynamic balancing and extreme attention to detail are mandatory steps in an engine build. Dynamic balancing is crucial to engine smoothness and survival because vibration (any vibration, no matter how small) kills. It shakes things to pieces. Not balancing an engine is foolish, courting disaster at worst and shortening engine life at best.
When you dynamic balance an engine, you balance the crankshaft (just as you would tires and wheels) for smooth operation. Then, you balance connecting rods and pistons to match the crankshaft balance. Do this every time you build an engine. If you have this problem a tune will not fix the issue.
Last edited by merc; 07-15-2008 at 07:20 AM.
James Brown #140 "Say It Loud" Except in Bristol
Merc's Garage
MagnaFuel ProTuner Series 750 MP-1403
Stainless Steel Works full exhaust
SCT Advantage III Ford Pro Racer Software
600.59 rwhp 559.91 Torque @ 20 lbs Boost
2.3 Whipple Intercooled Supercharger
BC Automotive Stage4 transmission
03 Terminator built by Chris Vining
I second what merc said.
If you bought a kit and 'bolted it in' this could be your problem.
But if you did not have the car tuned after the 5.0, go this route first.
#1724 of 3214 Built 02/13/2004
2004 Marauder black/moonroof
SCT flip chip, 4:10's, lowered, big brake kit
Kenwood KDC-X790 & 4 Kenwood speakers, 10" Sub
Addco tube sway bars & performance shocks, Metco's
Zex dry nitrous kit, Full SW Exhaust Kit, PI 3000 Stall
5.0L Stroker assembly, Self installed!
E.T. on drag radial tires: 12.270 @ 111.16 & 1.66 60'
One off custom Hood all steel too.
SOON TO BE Vortech supercharged
Ryan Schmuki
2003 Marauder, black with 4.10s n tune (sold)
1968 Fairlane 347 built stroker(fast)
1963 Galaxie 390 auto
2010 Mercury Milan
2019 Taurus Limited
#1724 of 3214 Built 02/13/2004
2004 Marauder black/moonroof
SCT flip chip, 4:10's, lowered, big brake kit
Kenwood KDC-X790 & 4 Kenwood speakers, 10" Sub
Addco tube sway bars & performance shocks, Metco's
Zex dry nitrous kit, Full SW Exhaust Kit, PI 3000 Stall
5.0L Stroker assembly, Self installed!
E.T. on drag radial tires: 12.270 @ 111.16 & 1.66 60'
One off custom Hood all steel too.
SOON TO BE Vortech supercharged
Ryan Schmuki
2003 Marauder, black with 4.10s n tune (sold)
1968 Fairlane 347 built stroker(fast)
1963 Galaxie 390 auto
2010 Mercury Milan
2019 Taurus Limited
Are you running the same plug gap with and without the Nitrous?
am having the same problem since we as country went to 10 percent
ethanol!. i believe it has something to do with the o2 sensor . just a guess. we use to use ethanol to pas emission inspections years ago when we did not have time for a thirty to forty min. warm up and it worked.
will run out this tank and fill with gas i have stored for my generator and
post again. or you could run almost empty and try some aviation fuel?.
good luck by the way i`v lost two M.P.G. since the change....
Last edited by merc; 07-15-2008 at 09:23 AM.
James Brown #140 "Say It Loud" Except in Bristol
Merc's Garage
MagnaFuel ProTuner Series 750 MP-1403
Stainless Steel Works full exhaust
SCT Advantage III Ford Pro Racer Software
600.59 rwhp 559.91 Torque @ 20 lbs Boost
2.3 Whipple Intercooled Supercharger
BC Automotive Stage4 transmission
03 Terminator built by Chris Vining
#1724 of 3214 Built 02/13/2004
2004 Marauder black/moonroof
SCT flip chip, 4:10's, lowered, big brake kit
Kenwood KDC-X790 & 4 Kenwood speakers, 10" Sub
Addco tube sway bars & performance shocks, Metco's
Zex dry nitrous kit, Full SW Exhaust Kit, PI 3000 Stall
5.0L Stroker assembly, Self installed!
E.T. on drag radial tires: 12.270 @ 111.16 & 1.66 60'
One off custom Hood all steel too.
SOON TO BE Vortech supercharged
Ryan Schmuki
2003 Marauder, black with 4.10s n tune (sold)
1968 Fairlane 347 built stroker(fast)
1963 Galaxie 390 auto
2010 Mercury Milan
2019 Taurus Limited
#1724 of 3214 Built 02/13/2004
2004 Marauder black/moonroof
SCT flip chip, 4:10's, lowered, big brake kit
Kenwood KDC-X790 & 4 Kenwood speakers, 10" Sub
Addco tube sway bars & performance shocks, Metco's
Zex dry nitrous kit, Full SW Exhaust Kit, PI 3000 Stall
5.0L Stroker assembly, Self installed!
E.T. on drag radial tires: 12.270 @ 111.16 & 1.66 60'
One off custom Hood all steel too.
SOON TO BE Vortech supercharged
Ryan Schmuki
2003 Marauder, black with 4.10s n tune (sold)
1968 Fairlane 347 built stroker(fast)
1963 Galaxie 390 auto
2010 Mercury Milan
2019 Taurus Limited
I had an 89 Escort GT that bucked like hell at 35 to 55 MPH. It had a bunch of sensors replaced over time. I think the MAF, TPS and O2's.... It was long drawn out process to solve, but eventually we got it.
Sounds like a metering issue to me, and don't disagree it is in the engine...
Built: 3/16/2004Number 9,879 of 11,052 for Total ProductionNumber 2,040 of 3,213 for 2004 Model YearNumber 663 of 980 Dark Toreador Red ProducedDark Charcoal Interior - CD Changer - Heated Seats - Trunk Oganizer - Moonroof - Rear Deck SpoilerTrilogy S/C kit #224 installed August 2010Detroit Tru-Trac 31 spline with 4.10 gearsetMust - Go - Faster !
You might have a good engine tuner but the art to getting to the Marauder to sing is in the transmission. Low RPM's in high gear will cause your bucking problem. Since our transmissions are electronic controlled then it would be in the tune. What's your rear gear ratio?
James Brown #140 "Say It Loud" Except in Bristol
Merc's Garage
MagnaFuel ProTuner Series 750 MP-1403
Stainless Steel Works full exhaust
SCT Advantage III Ford Pro Racer Software
600.59 rwhp 559.91 Torque @ 20 lbs Boost
2.3 Whipple Intercooled Supercharger
BC Automotive Stage4 transmission
03 Terminator built by Chris Vining
"also have a new hyundai 6000 mi. was getting 27 mpg. hwy , now down to 24. same driver, different gas . the cumberland farms station was the last here to implement --.-- citrus county fl.
if your not affected ,i am glad for you , but if you know somethink i don`t
i hope you will share ..
the hyundai runs like it was on rails , but it`s the marauder that lays the track, got to love it ,. thanks
Who went to 10% e?
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