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98 Mustang GT 4.6 / Hesitation, while cruising between 40 -70

  • Thread starter Thread starter Mike554
  • Start date Start date Feb 3, 2012
M

Mike554

New Member
Feb 3, 2012
1
0
1
Feb 3, 2012
#1
  • Feb 3, 2012
  • #1
This issue is driving me insane, everytime I drive this car ONLY when it's HOT( not cold, first 15 min)it will hesitate or have a slight buck when I'm crusing between 40-70. I really don't have a problem ( or atleast it's not noticeable) when I accelerate, but it has been RUNNING RICH. I have replaced Wires, Plugs, Fuel Filter, Fuel Pump, Coils, EGR, TPS, O2 Sensors, Mass Air, K&N Air Filter, Main Computer, (all top brand names). I also use Z-Max every 6000 miles for fuel injection and engine, Mobile 1 15000 miles synthetic oil( change every 7500) and I still can't fix the problem. Someone please steer me in the right direction so I don't have to bring it to the dealer and be at their mercy.

Thanks,

Mike
 

Gtwo

Previously 984.65spd
Jan 22, 2012
151
0
17
arcadia florida
Feb 3, 2012
#2
  • Feb 3, 2012
  • #2
Any codes?
Scan it and let us know.
 

nyuk98gt

15 Year Member
Oct 10, 2000
1,427
6
79
Chesterfield, MO
Feb 3, 2012
#3
  • Feb 3, 2012
  • #3
Mike554:

Couple things. First, test the ECT sensor. There's one for the gauge and there's the ECT sensor. The computer uses ECT for a lot of things and a bad sensor will give the car some issues. Next: is your transmission an auto or manual? If auto, the torque converter can lock-unlock, depending on speed and load on the engine. You can test this by slightly touching the brake pedal to keep the torque converter unlocked. If this is the problem (locking/unlocking) then a modified tune will take care of it.

HTH,

Chris
 

evolucion311

Member
Mar 19, 2009
236
2
18
Feb 7, 2012
#4
  • Feb 7, 2012
  • #4
nyuk98gt said:
Mike554:

Couple things. First, test the ECT sensor. There's one for the gauge and there's the ECT sensor. The computer uses ECT for a lot of things and a bad sensor will give the car some issues. Next: is your transmission an auto or manual? If auto, the torque converter can lock-unlock, depending on speed and load on the engine. You can test this by slightly touching the brake pedal to keep the torque converter unlocked. If this is the problem (locking/unlocking) then a modified tune will take care of it.

HTH,

Chris
Click to expand...

This 4.6 also has a cylinder head temp (CHT) sensor in addition to the ECT, if I remember correctly.
 
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