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EL XR6 rough idle like a miss fire 

 

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 Post subject: EL XR6 rough idle like a miss fire
Posted: Tue Jun 10, 2008 7:17 pm 
Tyre Shredder
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Ride: 09 FG XR6

Power: 208 rwkw

Location: Wallerawang
NSW, Australia

my car for a wile now has been having a slight miss or just a rough idle it's fine everywhere else in the revs just at idle its rough and when i go from speed on the breaks the idle drops right down as if it almost stals i've got brand new leads/plugs, dizy cap, rotor button just did the head gasket on it cause it was leaking coolant had a off car injector clean a few months back and today i just put a new pcv valve on it but she's still no good i just dunno what it could be any help would be great thanks

 

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Posted: Tue Jun 10, 2008 9:13 pm 
Tyre Shredder
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have you replaced the fuel filter???
have a look at the forum i started a couple of days ago as i have the same problem.
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Posted: Tue Jun 10, 2008 10:03 pm 
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ok cool can u please shoot me a link? yer i did it about 15k ago

 

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Posted: Tue Jun 10, 2008 10:54 pm 
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http://www.fordmods.com/forums/missing- ... 65966.html

if that doesnt work its on the first page in the 6 cylinder workshop section at the moment
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Posted: Wed Jun 11, 2008 8:30 am 
Getting Side Ways
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welcome to my world.
I have an EL xr6 as well, and unless i down shift 1 or 2 gears, more than likely the car will struggle and stall.

kinda scary doing 80k's, knocking it into neutral then having it stall while still having speed..

(manual by the way)

 

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Posted: Wed Jun 11, 2008 10:14 am 
Tyre Shredder
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yer it is scary ay myn dose it just as i stop and the auto shifts down pisses me off its so imbarasing well i did a few checks on it last night and it aint fuel related so im thinking the coil might be shot or about to go or maby the dizy but im gunna put it on my mates scaner soon tho to make shure cuase it could also be a o2 sensor being retarded so we'l see

 

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Posted: Wed Jun 11, 2008 2:35 pm 
Getting Side Ways
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could be that the box needs a service too, dont discount that

 

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Posted: Wed Jun 11, 2008 8:03 pm 
Getting Side Ways
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Check your ECU fault codes. I would say a stuffed oxygen sensor.

 

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Posted: Thu Jun 12, 2008 10:02 pm 
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yer did that today a code p050 i think camer up but i didn't find a match for it it has a chip but it was doing it before the chip any 1 have a ideas? apart from that noting at all replaced the coil with a test 1 and still no good im lost for ideas

 

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Posted: Thu Jun 12, 2008 10:39 pm 
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Ahhhh yes.

Well, on LPG the problem is/was caused by Voltage drop. The o2 sensor is referenced to the engine ground, and if there is a voltage difference between engine, battery, and body you'll get a false reading. normally doesnt matter at speed, but at idle when there isnt a lot of fuel to play with it will stall easilly.

Remember - o2 sensor range = 0-1v, and usefull range is .2 - .8v.

If you have .5v drop/gain, then your way out, and the ECU will try and correct.

I replaced all my earth leads (Engine to Battery - the big big one), and ran some new ones from the block to the body (same). Problem all gone away.

Nigel
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Posted: Thu Jun 19, 2008 3:32 pm 
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brad17djr wrote:
yer it is scary ay myn dose it just as i stop and the auto shifts down pisses me off its so imbarasing well i did a few checks on it last night and it aint fuel related so im thinking the coil might be shot or about to go or maby the dizy but im gunna put it on my mates scaner soon tho to make shure cuase it could also be a o2 sensor being retarded so we'l see


If its the same symptoms I was having a while back, (car wasn't running "right" and when slowing down to a stop, and changing down gears, revs were dropping really low) then it might be the Ignition coil.

Once this was replaced, the problem went away after a few days.. (computer reset maybe? dunno)
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Posted: Sat Jun 21, 2008 7:29 pm 
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spray carby cleaner on the inlet manifold gasket while running and listen for revs to change when spraying. Could be vacuum leak
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Posted: Wed Jun 25, 2008 9:11 pm 
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Hey Mates,

I have the exact same symptoms for my EF Futura. Initially it was only while running on LPG but the problem has crept into the petrol operation as well. Would a head gasket on the way out represent similar symptoms? any reply appreciated.

-jaz

 

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Posted: Wed Jun 25, 2008 9:17 pm 
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Ride: 09 FG XR6

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NSW, Australia

yer checked for the vac leaks before and nothing at all and we put a test coil on it and ran it for a bit but it was still there maby its a tps on the way out or a pcm thats rooted i dunno but its pissing me of maby a map sensor too but that should happen all the time shoulden't it?

 

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Posted: Wed Jun 25, 2008 9:34 pm 
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my old car was an EB and it did the same at idle, not while reving, and i cant remember wether it was doing whil braking from speed, it was a vacuum hose?map sensor problem,

 

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