this is a 1.6 8V TU petrol,
on idle not every time if the throttle is blipped and on the revls settling back down the engine surges slightly,
on plugging my DIS-LEXIA up it two fault codes came back
P0300 = random misfire
P0304 = misfire on cylinder No.4
whilst running live data it showed the coils pack readings
1 & 4 1.84ms
2 & 3 2,5ms
although 2 & 4 varied as reves were added
somtimes matching 1 & 4 and other times going up to 2.84
any ideas
i took the spark plugs out and they all look the same colour, not sooty ( or sweepy )
03 Xsara Picasso misfire/flat spot, surging
Moderator: RichardW
03 Xsara Picasso misfire/flat spot, surging
Regards, malcolm.
current ride a BX 1.7 TZD estate
1986 MK1 BX 1.9na D Auto(in Mothman Andy's stable )
layed up roppy 1.9TD XANT estate, now gone to meet her maker
purple and lilac metalic 2CV(VIOLET)registered to her in doors
1972 DS special been layed up aprox 31 years
current ride a BX 1.7 TZD estate
1986 MK1 BX 1.9na D Auto(in Mothman Andy's stable )
layed up roppy 1.9TD XANT estate, now gone to meet her maker
purple and lilac metalic 2CV(VIOLET)registered to her in doors
1972 DS special been layed up aprox 31 years
Re: 03 Xsara Picasso misfire/flat spot, surging
ps.
forgot to add
injector time came up as
0.000ms
injector cut off
NO!
this was with the engine running
forgot to add
injector time came up as
0.000ms
injector cut off
NO!
this was with the engine running
Regards, malcolm.
current ride a BX 1.7 TZD estate
1986 MK1 BX 1.9na D Auto(in Mothman Andy's stable )
layed up roppy 1.9TD XANT estate, now gone to meet her maker
purple and lilac metalic 2CV(VIOLET)registered to her in doors
1972 DS special been layed up aprox 31 years
current ride a BX 1.7 TZD estate
1986 MK1 BX 1.9na D Auto(in Mothman Andy's stable )
layed up roppy 1.9TD XANT estate, now gone to meet her maker
purple and lilac metalic 2CV(VIOLET)registered to her in doors
1972 DS special been layed up aprox 31 years
Re: 03 Xsara Picasso misfire/flat spot, surging
might be way off but there is an idle control valve on throttle body, it acts as an anti stall. If they seize up (and they do often) when the revs drop the engine tries to stall this valve should come in and stop it. If its not working the engine surges and hunts and sometimes stalls.
Re: 03 Xsara Picasso misfire/flat spot, surging
With the limited information you've given it sounds like an ignition misfire as the differences in charge time between the two coils is excessive, and it's suspicious that one is jumping around while the other is steady. The figure jumping around suggests an intermitent lack of spark or that the spark is jumping to earth somewhere other than the spark plug electrode.
If the spark plugs look ok I'd be suspicious of the spark plug leads. Is the engine one where you could swap the leads for cylinders 1 and 4 with those for cylinders 2 and 3 and see if the charge times and/or misfire codes swap around as well ? (Or if you have a suitable set of leads you can borrow off a known good engine try that...)
It could be a coil but I would rule out the leads first.
PS is there a lack of power when driving ?
If the spark plugs look ok I'd be suspicious of the spark plug leads. Is the engine one where you could swap the leads for cylinders 1 and 4 with those for cylinders 2 and 3 and see if the charge times and/or misfire codes swap around as well ? (Or if you have a suitable set of leads you can borrow off a known good engine try that...)
It could be a coil but I would rule out the leads first.
PS is there a lack of power when driving ?
Simon
1997 Xantia S1 3.0 V6 Auto Exclusive in Silex Grey
2016 Nissan Leaf Tekna 30kWh in White
2011 Peugeot Ion Full Electric in Silver
1977 G Special 1129cc LHD
1978 CX 2400
1997 Xantia S1 2.0i Auto VSX
1998 Xantia S2 3.0 V6 Auto Exclusive
1997 Xantia S1 3.0 V6 Auto Exclusive in Silex Grey
2016 Nissan Leaf Tekna 30kWh in White
2011 Peugeot Ion Full Electric in Silver
1977 G Special 1129cc LHD
1978 CX 2400
1997 Xantia S1 2.0i Auto VSX
1998 Xantia S2 3.0 V6 Auto Exclusive
Re: 03 Xsara Picasso misfire/flat spot, surging
If this is anything at all like the 1.8 motor, then it's a coil. My 1.8 Xantia did the exact same thing. So badly it used to cut out in traffic . Was on the way to pick up new coils for it when it juddered so badly the timing belt broke.
It broke in the outside lane, approaching the Hangar Lane gyratory from the West at about 8:50am.
It broke in the outside lane, approaching the Hangar Lane gyratory from the West at about 8:50am.
Re: 03 Xsara Picasso misfire/flat spot, surging
thanks Simon but it dont have HT leads but a coil pack directly onto the plugs,Mandrake wrote:With the limited information you've given it sounds like an ignition misfire as the differences in charge time between the two coils is excessive, and it's suspicious that one is jumping around while the other is steady. The figure jumping around suggests an intermitent lack of spark or that the spark is jumping to earth somewhere other than the spark plug electrode.
If the spark plugs look ok I'd be suspicious of the spark plug leads. Is the engine one where you could swap the leads for cylinders 1 and 4 with those for cylinders 2 and 3 and see if the charge times and/or misfire codes swap around as well ? (Or if you have a suitable set of leads you can borrow off a known good engine try that...)
It could be a coil but I would rule out the leads first.
PS is there a lack of power when driving ?
ok thanks Mikenorthern_mike wrote:If this is anything at all like the 1.8 motor, then it's a coil. My 1.8 Xantia did the exact same thing. So badly it used to cut out in traffic . Was on the way to pick up new coils for it when it juddered so badly the timing belt broke.
It broke in the outside lane, approaching the Hangar Lane gyratory from the West at about 8:50am.
on this car the surging at ifle is very mild and it just has a flat spot as you start to bring in the gas
Regards, malcolm.
current ride a BX 1.7 TZD estate
1986 MK1 BX 1.9na D Auto(in Mothman Andy's stable )
layed up roppy 1.9TD XANT estate, now gone to meet her maker
purple and lilac metalic 2CV(VIOLET)registered to her in doors
1972 DS special been layed up aprox 31 years
current ride a BX 1.7 TZD estate
1986 MK1 BX 1.9na D Auto(in Mothman Andy's stable )
layed up roppy 1.9TD XANT estate, now gone to meet her maker
purple and lilac metalic 2CV(VIOLET)registered to her in doors
1972 DS special been layed up aprox 31 years
Re: 03 Xsara Picasso misfire/flat spot, surging
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