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Old 10-19-2014, 09:01 AM   #1
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ride not smooth

I have an 02 gt and if i go like 10-15 mph (only happens at low speeds in a low gear 1,2) and let off the gas pedal the car will start jerking and i will hear a clanking sound.
It is really annoying and i was wondering if anyone here knows how to fix it.
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Old 10-19-2014, 11:55 AM   #2
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How does your car idle when it's not moving? Is the idle nice and steady or does it seem to jump around a bit?
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Old 10-19-2014, 12:03 PM   #3
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The idle is nice and steady with ac off just started noticing that my steering wheel is kinda shaking in idle if that has anything to do with it.


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Old 10-19-2014, 12:21 PM   #4
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Hmmm.
How long has it been since your car has had a thorough tune-up?
How many miles are on the car?
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Old 10-19-2014, 12:52 PM   #5
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Did spark plugs 1k miles ago the car has 140k i recently replaced the iac with a motorcraft one from rockauto because the car would be hard to start and sometimes even stall when cruising to a red light the new iac worked good for the first week now it makes a weird sound and the car is hard to start again so my guess is that the iac they sold me was faulty.



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Old 10-19-2014, 01:03 PM   #6
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It may be the IAC.
What about the the throttle body and the MAF? Did you clean those as well?
Replace the fuel filter?
Check for vacuum leaks?

The IAC typically makes a horn noise when they are malfunctioning. And they have a difficult time holding a steady idle. It wouldn't be the first time that a Motorcraft IAC was bad right out of the box but I'd make sure that everything else is working properly before replacing it again.
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Old 10-19-2014, 01:11 PM   #7
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Cleaned maf and replaced fuel filter about 2k ago no vacuum leaks when im sitting in idle and hit the gas a little the noise will go away as soon as a let go of the gas the noise comes back


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Old 10-19-2014, 01:14 PM   #8
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Did you clean the throttle body?

What you are describing sure as hell sounds like the IAC...
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Old 10-21-2014, 03:22 PM   #9
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Sounds to me like you're describing drivetrain slack. Bad or loose mounts could cause this. My 96 was doing this and it was slop in the rear end.
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Old 10-21-2014, 04:03 PM   #10
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Quote:
Originally Posted by Billgluckman View Post
Sounds to me like you're describing drivetrain slack. Bad or loose mounts could cause this. My 96 was doing this and it was slop in the rear end.
how do i check tranny mounts etc. ?
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Old 10-21-2014, 07:47 PM   #11
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Motor Mounts

To be clear, when you let off the gas does the engine try to die and cause the car to buck? Or does the car just do it and the engine runs normal?

Re reading everything it sounds like more than slack or a mount. If the noise you hear sounds like a horn then yes, as the poster above said, iac.

My first reply was going off reading the first post only
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Old 10-21-2014, 08:13 PM   #12
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The motor runs normal so thats not the cause of the bucking and the iac sounds like a really high pitched horn and if i start the engine the engine will start and then the rpms will go down to around 400-500 for a second and then back to normal. So should a check motor mounts tranny mounts and the u joints?


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Old 10-21-2014, 09:12 PM   #13
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I would start by checking them to solve the vibration and clanking sound you hear. The parts are cheap if you can do your own work I'd say replace them and eliminate the possibility.
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Old 10-22-2014, 05:47 AM   #14
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Quote:
Originally Posted by Billgluckman View Post
I would start by checking them to solve the vibration and clanking sound you hear. The parts are cheap if you can do your own work I'd say replace them and eliminate the possibility.
alright man thanks for the advice
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