does anybody know why my car is real sluggish on take off???

dannyp8105 · Jul 17, 2010

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!!!

CobraRed_96_GT · Jul 17, 2010

striker911 · Jul 17, 2010

Its got a 4.6

dannyp8105 · Jul 17, 2010

thats what i was thinking that it was the iac i just bought all the other **** and ran out of cash wtf!! but thats the next one to be replaced...

dannyp8105 · Jul 17, 2010

if thats not it then i have no clue from there i guess it would have to be somthing internal...

GettinThere · Jul 18, 2010

dannyp8105 said:
...cats are gone brand new x pipe with all four 02 sensors brand new...

Something doesn't seem right here...

dannyp8105 said:
...i just bought all the other **** and ran out of cash...

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.

dannyp8105 · Jul 18, 2010

its been in the shop a few times but i guess i'm not taking it to the rite one...

hotcobra03 · Jul 18, 2010

slow

egr?

Kilgore Trout · Jul 18, 2010

Could be a lot of things, have it diagnosed at the stealership.

dannyp8105 · Jul 18, 2010

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....

dannyp8105 · Jul 18, 2010

AND ALSO WHEN I HIT THE GAS THE IDLE WILL STAY HIGH FOR A BIT THEN SLOWLY DROP AT ABOUT 2500rpm to normal idle it takes like 5-10 sec to drop...

slayerripkdc · Jul 18, 2010

gears?????

dannyp8105 · Jul 18, 2010

what about the gears???

trombonedemon · Jul 18, 2010

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.

slayerripkdc · Jul 18, 2010

the stock 3.27's gear ratio seems kind of sluggish. Get some 4.10's if all else checks out good.

ChillPhatCat · Jul 18, 2010

dannyp8105 said:
AND ALSO WHEN I HIT THE GAS THE IDLE WILL STAY HIGH FOR A BIT THEN SLOWLY DROP AT ABOUT 2500rpm to normal idle it takes like 5-10 sec to drop...

That's normal, they all do that from the factory.

32ValveRom · Jul 18, 2010

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 · Jul 18, 2010

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.

dannyp8105 · Jul 19, 2010

the car does'nt cut off when i unplug the IAC but the idle changes when i hit the gas it does'nt stay up at 2000-2500 rpm for a long time it drops fast like it should but with it of it still idles rough..

dannyp8105 · Jul 19, 2010

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..

does anybody know why my car is real sluggish on take off???

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