my 2002 GT is real sluggish on take off it acts like it doesnt want to go and it gets real bad when i have my A/C on.... i have changed the tps sensor/cats are gone brand new x pipe with all four 02 sensors brand new, new fuel pump new mass air sensor,all new pluggs motorcraft platinum, i have checked for vaccum leaks with the carb cleaner and found nothin i can not figure it out please if someone can tell me somthing it would be great!!!
does anybody know why my car is real sluggish on take off???
- Thread starter dannyp8105
- Start date
CobraRed_96_GT
Active Member
striker911
Member
Something doesn't seem right here...
Instead of throwing parts at it, you probably would be better off getting a mechanic (or somebody who knows what to look for) to fix it. Good luck.
hotcobra03
Active Member
U KNOW IT COULD BE THE EGR ALSO BUT I HAVE NEVER HAD A CHECK ENGINE LIGHT ONLY FOR THE 02 SENSORS. I BET THAT THE IAC,EGR ARE GOING BAD JUST NOT THROWING THE CODE YET BUT STILL I'M STUMPED??? I REALLY DONT WANT TO TAKE IT BACK TO THE SHOP CAUSE IT ABOUT A 100$ EVERYTIME FOR THE DIAGNOSTICS....
slayerripkdc
15 Year Member
trombonedemon
Well-Known Member
If its any consolation, I'm on my 3rd IAC, those are known to go bad quickly. Change your fuel filter, check for leaks in your intake, clean your throttle body and upper intake. You might want to invest in a catch can, blowby causes a lot of uncoded problems. Use a fuel system cleaner, Pepboys or Autozone usally has some kind'a sell on them. Are you using your Track control?
Sounds definantly like an Air problem. Unplug your IAC to see if your car cuts off.
Sounds definantly like an Air problem. Unplug your IAC to see if your car cuts off.
slayerripkdc
15 Year Member
the stock 3.27's gear ratio seems kind of sluggish. Get some 4.10's if all else checks out good.
ChillPhatCat
20+ Year Stangneter 
32ValveRom
Member
Idk if gears will work (especially with the a/c on) but like some others said check the regular maintenance stuff like air filter, oil, fuel filter spark plugs, etc. Does sound like an IAC problem though
wmburns
SN Certified Technician
How many miles? Why did you replace all 4 O2 sensors? I assume it has a new fuel filter as well.
Have you changed ALL of those parts trying to isolate this problem?
Manual or automatic? If automatic, what is the condition and level of the fluid?
Have you done any data logging? Would be handy to know the LTFT at idle and under load.
What are the results of a compression test? What about your gas mileage?
Have you done a through inspection of your brakes? How about tire pressure?
FWIIW, it certainly is possible for the EGR valve to be partially open and still not throw a DTC. If this is a high mileage car and you are still in the mood to throw parts at it, replace the EGR valve.
FWIIW2, I don't think a bad IAC is going to cause sluggish performace off the line (assuming the car idles). The slow return to idle is normal. If the car idles excessivly high for an extended period of time, then there is a problem.
If you are tired of throwing parts at the problem, then be prepared to perform some detailed tests and post the results.
Have you changed ALL of those parts trying to isolate this problem?
Manual or automatic? If automatic, what is the condition and level of the fluid?
Have you done any data logging? Would be handy to know the LTFT at idle and under load.
What are the results of a compression test? What about your gas mileage?
Have you done a through inspection of your brakes? How about tire pressure?
FWIIW, it certainly is possible for the EGR valve to be partially open and still not throw a DTC. If this is a high mileage car and you are still in the mood to throw parts at it, replace the EGR valve.
FWIIW2, I don't think a bad IAC is going to cause sluggish performace off the line (assuming the car idles). The slow return to idle is normal. If the car idles excessivly high for an extended period of time, then there is a problem.
If you are tired of throwing parts at the problem, then be prepared to perform some detailed tests and post the results.
yeah the car has 95000 on it its a 5 speed. yeah i have changed most of the parts trying to get rid of the problem but the 02 sensors were still factory and when i put the x pipe on they started to fail one at a time. yeah and my gas milage is the worst i have ever seen i mean BAD!!! i have not done any logging on it no real internal test like measuring cam lobes and looking for wear spots cause i have to drive this car everyday also.. ive tested for the vaccum leak with carb cleaner,or the soapy water test but still i get nothing..
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