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why is my car running like a nugget? 

 

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 Post subject: why is my car running like a nugget?
Posted: Tue Mar 25, 2008 5:43 pm 
Tyre Shredder
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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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Posted: Tue Mar 25, 2008 7:11 pm 
Getting Side Ways
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vaccum leak? ISC dead?

 

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Posted: Tue Mar 25, 2008 7:13 pm 
Tyre Shredder
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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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Posted: Tue Mar 25, 2008 8:04 pm 
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clean the throttle body

 

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

 

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Posted: Wed Mar 26, 2008 4:06 pm 
Getting Side Ways
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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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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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Posted: Wed Mar 26, 2008 7:14 pm 
Tyre Shredder
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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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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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Posted: Thu Mar 27, 2008 7:26 pm 
Tyre Shredder
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s**t this don't look good ay haha

 

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

 

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Posted: Fri Mar 28, 2008 2:14 am 
Getting Side Ways
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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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Posted: Fri Mar 28, 2008 2:17 am 
Getting Side Ways
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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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Posted: Fri Mar 28, 2008 2:30 am 
Getting Side Ways
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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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