On thursday went to chester zoo and the tin top was fine all the way there and back, after a few hours drove a few miles to take the missus out for
dinner, coming back on an steady throttle at about 2500 rpm it would hesitate and jump then when higher up the rev range on full throttle it would be
fine.
then yesterday on the way back from work it would cut out for a second, im not sure if any of the cylinders were firing at all.
when first starting the car it seems fine then after a mile it would idle really roughly and stopped once.
I think this is a sparking issue but not entirely sure, ill replace the spark plugs today but i think it might be the coil packs.
the thing im not sure of is why it would cut out then all of a sudden come back.
The car is an X reg Seat Leon Cupra 1.8T
[Edited on 3/6/06 by Gav]
[Edited on 3/6/06 by Gav]
I had similar trouble with Nissan 200. Replace coilpacks seems to have cured it. If internal break, it may be ok, making contact until heats up, then
becomes intermittent.
I also had similar problem with Sierra (normal single coil) which was simply loose connection to the ignition amplifier module
I used to have a similar type problem on a 405 mi16 which turned out to be the lamba sensor.
When the coil pack on my Leon went. It went completely.
Not much warning.
Couple of "coughs" and "splutters" then...
ECU switched to limp home mode.
Changed a coil pack under warrantee (alegedly a bad batch) and no trouble since 3+ years.
Seems like you have a definative answer!
Sounds like it could well be the coil pack but it could be the throttle pot or one of the other main sensors ie MAP, or temperature or even crank
angle.
In addition Check all the main battery and alternator connections any problem whith these can create a voltage spike that drives the ecu mad and can
give the exact symptoms you describe
quote:
Originally posted by Aboardman
I used to have a similar type problem on a 405 mi16 which turned out to be the lamba sensor.
lambda sensors dont so much fail as grow old and slow down as they should swich from lean to rich to maintain the correct afr under steady load and wont always flag up a problem until they fail completely which i havent seen that often. it does seem that poor design, wiring faults and security systems cause as much trouble as faulty components these days and the only coil pack i hardly ever change is the bm bosch one !
I replaced the spark plugs and it was just the same, took it for a blast and its seemed ok once the engine was warmed up but once the engine had
cooled down again and restarted it came back. So dosnt look like the ecu is switching to limp mode as iirc this has to be reset by manually(?)
Taking it to the dealers since i carnt get hold of my mate with a copy of VAGCOM to check the error codes.
error code would just probably come up with a P030* ie missfire detected.
Got a splashy misfire on the R75 just now, mainly happens exiting roundabouts --- I suspect water in the fuel or a loose connector, going to look at
it this afternoon if nothing obvious turns up the Arnold Clark service department gets a warranty job.
Rover problem turned out to be plug flashing over --- takes out both cylinders fed from the coil pack. If i had left it longer it could have taken
out the coil pack
The Plugs are supposed to last to be changed at 60k mile intervals crazy ! --- so scrapped the platium plugs and stuck conventional NGK ones which I
will change 12k mile intervals.
I am also going to change the short plug lead to the coil pack on the plug that was flashing over.
Just for any future reference, the local seat garage confirmed it was a lambda sensor that had gone.
