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idling rough

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Mustang Forum >> Ford Mustang Tech >> 2005 - 2008 Mustangs >> 4.6L V8 Specific >> idling rough Page: [1]
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idling rough - 2/22/2008 5:50:25 PM   
*bmxking*


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so my car will idle at around 800 and then it will rev up 100 rpm or so and somtime drop.  the shop i went to told me it was the aftermarket o2 sensor so i replaced it with a factory one and it still does the same thing.  i have a a/f gauge and it spikes from rich to lean when the rpm jump.  and thought anything will help  thanks

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RE: idling rough - 2/22/2008 5:53:42 PM   
GidyupGo

 

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Does this happen all the time or only when cold?


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RE: idling rough - 2/22/2008 6:16:43 PM   
hammeron


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could be a few things...

air leak in the air intake (after the MAF)
MAF needs cleaning
throttle body needs cleaning


(in reply to GidyupGo)
Post #: 3
RE: idling rough - 2/22/2008 6:17:00 PM   
*bmxking*


Posts: 76
Joined: 2/14/2006
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all the time

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P1SC H.O. procharger
sct2
dynatech longtube headers
x-pipe high flow cats
flowmasters
hurst short shifter
Eibach pro kit
cervinis hood, side scoops, & spoiler
Konig beyond 255/35/20 frt 275/35/20 rear
527 hp 460lb tq

(in reply to GidyupGo)
Post #: 4
RE: idling rough - 2/22/2008 6:20:41 PM   
*bmxking*


Posts: 76
Joined: 2/14/2006
Status: offline
i read omthing on hear about people having probs with cam postioning sensors

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P1SC H.O. procharger
sct2
dynatech longtube headers
x-pipe high flow cats
flowmasters
hurst short shifter
Eibach pro kit
cervinis hood, side scoops, & spoiler
Konig beyond 255/35/20 frt 275/35/20 rear
527 hp 460lb tq

(in reply to *bmxking*)
Post #: 5
RE: idling rough - 2/22/2008 6:56:35 PM   
Simon1

 

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Joined: 12/19/2006
From: Northern California
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It could be lots of things.  I would check all air connections, boost and vaccum.

Maybe reflash the tune too.

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(in reply to *bmxking*)
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RE: idling rough - 2/22/2008 6:57:39 PM   
hammeron


Posts: 7821
Joined: 5/17/2006
Status: offline
that was one person, dex i believe...

one of the sensor wires was broke (or it wasn't connected,
can't remember) and it was causing the car to run extremely lean....

that was the story as i recall it.....









quote:

ORIGINAL: *bmxking*

i read omthing on hear about people having probs with cam postioning sensors

(in reply to *bmxking*)
Post #: 7
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