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why is my car running like a nugget? 

 

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brad17djr
 Post subject: why is my car running like a nugget?
Posted: Tue Mar 25, 2008 5:43 pm 
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hey can any 1 help me here its a tricky 1
well i got a el xr6 and at idle it has a slight miss in it and if u start it after it's been sitting for a wile it coughs and splutters when u go for the go pedal then clears up again also when u put ur foot on the brake's the revs drop down heaps and it feels like it's stalling it's realy pissing me off i can't find it. its got a chip in it and it has to run on 98 unleaded but i don't think it's fuel quality i've dun leads and plugs and gave the injectors a clean and the throttle body but still the same it's got me stumped

thanks fellas

 

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SgtBourne
Posted: Tue Mar 25, 2008 7:11 pm 
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vaccum leak? ISC dead?

 

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brad17djr
Posted: Tue Mar 25, 2008 7:13 pm 
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yer how can i find out tho just spray water onto the manifold and vac lines? and whats ISC?

 

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fiftyone
Posted: Tue Mar 25, 2008 8:04 pm 
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clean the throttle body

 

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brad17djr
Posted: Tue Mar 25, 2008 8:52 pm 
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yer already do that a fair bit she's as clean as a wistle

 

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mystro
Posted: Wed Mar 26, 2008 4:06 pm 
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mine ran like a turd once missin and crap turned out to be the master cylinder of all things
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redxtclone
Posted: Wed Mar 26, 2008 6:08 pm 
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could have dirty leads and plugs, missing a spark.

 

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brad17djr
Posted: Wed Mar 26, 2008 7:14 pm 
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yer i've herd that it could be the master cylinder how much would the be and how do u tell for shure? i'l have to pull the leads off and give them a clean and check the plugs

 

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pommie
Posted: Thu Mar 27, 2008 7:23 pm 
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hi i have the same problem!
i have replaced fuel pressure reg,isc, tps, throttle body,new head,iridium plugs and leads
so i too am lost gonna try a new map sensor , new injectors and oxygen sensor and hope for the best
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brad17djr
Posted: Thu Mar 27, 2008 7:26 pm 
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s**t this don't look good ay haha

 

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Steady ED
Posted: Thu Mar 27, 2008 7:27 pm 
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mystro wrote:
mine ran like a turd once missin and crap turned out to be the master cylinder of all things

Do you mean booster?
If the booster is split it'll cause a vacuum leak.
Check the booster visibly for a split/crack.
Or pull vac hose out of the booster, and block it with something, see if that improves the idle.
Another test, if you stop the car, do the brakes go hard straight away, or stay soft for a couple of pumps?

 

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brad17djr
Posted: Thu Mar 27, 2008 7:29 pm 
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yer sorry booster lol i dunno where my brain was

 

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Paulmac
Posted: Fri Mar 28, 2008 2:14 am 
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As above, to test just block the big vac line to the booster with your thumb and have the car revved.
Also check your cat converter, map and HEGO [oxy] sensors.
Cheers,
Paul

 

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alfy
Posted: Fri Mar 28, 2008 2:17 am 
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mine does this too, on cold starts it likes to cough and splutter when accellerating in gear, the previous owner gutted the cat, im replacing it tomorrow.
also when i accelerate up a hill, the aircon goes to the windscreen, then back to whatever when i back off again. this means vaccuum leak yeah?

sorry if i just repeated a whole lot of stuff and probably asked a question that has the answer right here, but i cbf reading heaps at this time of the morning.

cheers :)

 

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Paulmac
Posted: Fri Mar 28, 2008 2:30 am 
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Yes, but the coughing and spluttering may be unrelated though low vac wouldn't help. If any vac lines are loose fitting a smear of silicone will help them seal and maybe a new seat for where the booster vac line plugs in. It should be a tight fit.
Paul

 

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