Car shakes/stumbles at idle - Mustang Evolution

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Old 09-25-2012, 11:27 AM   #1
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Car shakes/stumbles at idle

So I notice my car shakes/ stumble and idles a little rough. It's noticeable enought that you can feel it when sitting still and see the shifter move. All so noticed the other day I had my car running and was standing near the back and there was a high pitched humming coming from the rear end that seemed to change when the car stumbled a little. Don't know if these are tied together or if there's vacuum lines down there but if anyone has an idea what could be causing this please lemme know.its driving me crazy
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Old 09-25-2012, 12:09 PM   #2
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Could possibly be the fuel pump going out, change your fuel filter first cuz maybe it's restricting the fuel line
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Old 09-25-2012, 01:05 PM   #3
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Already did the fuel filter a while ago. It doesn't really hesitate or anything while driving just at idle
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Old 09-25-2012, 01:44 PM   #4
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To make the car idle better get some sea foam to clean out everything and do you have an after market shifter?
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Old 09-25-2012, 01:49 PM   #5
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Done sea foam already and I have the stock shifter it's bone stock. It's my second stang so I know a bit about them just can't figure this out
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Old 09-25-2012, 01:55 PM   #6
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Quote:
Originally Posted by Dgerow12
Done sea foam already and I have the stock shifter it's bone stock. It's my second stang so I know a bit about them just can't figure this out
Is there anyway you can do a smoke test on it to check for vacuum leaks
From what I've seen sometimes if you run rough at idle and fine while driving, I've seen rich running conditions at idle like a sticking injector or something
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Old 09-25-2012, 07:14 PM   #7
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I'll try to get one done there not cheap around here. And just as an update my idle really doesn't fluctuate except for when I'm driving and I am coming to a stop and push the clutch in it sometimes tries to stall out. I'm wondering if its my iac
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Old 09-25-2012, 07:16 PM   #8
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Quote:
Originally Posted by Dgerow12
I'll try to get one done there not cheap around here. And just as an update my idle really doesn't fluctuate except for when I'm driving and I am coming to a stop and push the clutch in it sometimes tries to stall out. I'm wondering if its my iac
It could be your iac going out as well
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Old 09-26-2012, 04:09 AM   #9
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Quote:
Originally Posted by twotone01

It could be your iac going out as well
Yeah my iac barely runs right now. Say I'm driving at 2500rpm, it will just sit there even when I push in the clutch and throw it in to neutral. Is it misfiring or just shaking?
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Old 09-26-2012, 08:39 AM   #10
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No misfire just shakes. I got an 02 sensor code a while ago but then it went away and never came back. I wonder if one of my 02's is going out
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Old 09-26-2012, 09:32 AM   #11
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Your wrecking your engine. Get the front o2 sensors replaced. Your make the engine run hard and is you get an cold/ air intake I bet it will go Down
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Old 09-26-2012, 10:31 AM   #12
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My car was shaking like this right before the throwout bearing went out
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Old 09-26-2012, 11:15 AM   #13
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Quote:
Originally Posted by V6stang6272
Your wrecking your engine. Get the front o2 sensors replaced. Your make the engine run hard and is you get an cold/ air intake I bet it will go Down
Ok first off bro I've rebuilt engines and I know how to work on cars. I know more about engine control systems than a lot of people and I know how to trouble shoot. My car is running fine it just stumbles on idle occasionally. So don't even try telling me I'm ruining my engine I prolly know more about these engines than you. I HAD a code for about 3 hrs about two months ago and it went away after I drove my car. Common cause for the code was not giving the car time to warm up before driving it aka I started right up and took off down the road like a bat outta hell. I've never had any other code. An oxygen sensor can cause a slight issue in air fuel which could be enough to cause a slight stumble during idle. So think about who your talking to before you try telling someone their ruining thier engine when in reality you dont know anything about thier car because you dont drive it. And Joey that's interesting that you say they because my throw out bearing is also on its way out. RANT OVER
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Old 09-26-2012, 02:47 PM   #14
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Quote:
Originally Posted by Dgerow12
No misfire just shakes. I got an 02 sensor code a while ago but then it went away and never came back. I wonder if one of my 02's is going out
Well If it had an o2 code then just replace the bad o2, can't hurt. Mine stumbles a little at idle as well. But it's either my IAC or o2s, plus I have a bad cat. If t fixes your problem let me know, then ill replace mine
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Old 09-26-2012, 03:59 PM   #15
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Well It feels like a very slight shake but my Rpms never change. The needle doesn't even twitch when it's idling so I'm wondering if its the throw out bearing about to sh** the bed.
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Old 09-26-2012, 04:05 PM   #16
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Quote:
Originally Posted by Dgerow12
Well It feels like a very slight shake but my Rpms never change. The needle doesn't even twitch when it's idling so I'm wondering if its the throw out bearing about to sh** the bed.
Id say yeah check that mine did this shaking thing when id be at a stop and the needle didnt move the the next day i hear this horrible screeching sound because the throwout bearing went out.. i guess its a common thing for are cars.. or so ive heard
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Old 09-26-2012, 09:07 PM   #17
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Id say yeah check that mine did this shaking thing when id be at a stop and the needle didnt move the the next day i hear this horrible screeching sound because the throwout bearing went out.. i guess its a common thing for are cars.. or so ive heard
yeah mine is crap too. whenever i let out the clutch, i can hear squeaking but when its disengaged its nice and quiet
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Old 09-29-2012, 03:11 PM   #18
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Mine did this back when my coil pack was bad.
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Old 09-29-2012, 03:38 PM   #19
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Mine doesn't hesitate like yours did tho. There's not a change in how it runs except for the slight change in idle
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Old 09-29-2012, 03:46 PM   #20
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Originally Posted by Dgerow12
Mine doesn't hesitate like yours did tho. There's not a change in how it runs except for the slight change in idle
Then I'd have to say IAC needs a good cleaning
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Old 09-29-2012, 07:05 PM   #21
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Yea I cleaned it awhile ago but I think it may just need to be replaced. Next on my to do list. Besides getting my gt wheels on of course
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