Vectra misfire
in [Car Maintenance]
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From: 4square on 13 Jun 2010 11:11 On Jun 13, 3:32 pm, 4square <corde...(a)whsmithnet.co.uk> wrote: > On Jun 13, 1:17 pm, "Mrcheerful" <nbk...(a)hotmail.co.uk> wrote: > > > > > > > 4square wrote: > > > On Jun 13, 10:49 am, A.Cl...(a)DENTURESsussex.ac.uk wrote: > > >> Thus spake Mrcheerful (nbk...(a)hotmail.co.uk) unto the assembled > > >> multitudes: > > > >>> some vauxhalls can have the ecu reprogrammed to remove the egr from > > >>> the program, unfortunately this only applies to certain models/ecu > > >>> types. the egr sometimes just gets a bit of coke stuck in it, which > > >>> is enough to ruin the idle, sometimes it comes out on its own. > > >>> having the egr working or not does not seem to effect the mot > > >>> emissions afaik. > > > >> Certainly before my GF's car was 'fixed', the engine sounded like a > > >> diesel when it was idling, and acceleration was uneven and poor. > > > >> -- > > >> Andy Clews > > >> University of Sussex > > >> *** Remove DENTURES if replying by email *** > > > > Took to garage, with EML on. The analyser read 'coil pack fault', and > > > no other faults. > > > Fitter replaced spark plugs with new ones, and fault gone, EML out and > > > running well again. > > > Car was OK on way home, and tested it again this morning. OK for > > > about 20 miles, then when hot, EML on again, and running rough. So, > > > I reckon a new coil-pack needed. About £100 I think. > > > > I find it a bit odd, that the fault went with new plugs at garage, > > > when the engine was hot at the time. There does seem some > > > inconsistency here. Does make me wonder if its a bad connection but > > > that would surely be same when cold or hot engine? > > > there is a known fault with the connector to the coolant sensor, vauxhall > > make a kit of bits with gold plated connectors to cure it. there was also a > > problem with a bad earth on the ecm. but my money is still on a crank > > sensor. and crank sensor did not show up on the fault codes on a diesel > > vectra I did the other day, yet the sensor had no connection through it at > > all ! and replacing it cured the problems: rough idle, low performance and > > no rev counter.- Hide quoted text - > > > - Show quoted text - > > This is getting complicated! Where is the coolant sensor please? And > what does ecm stand for? > Gold-plated connectors sounds a bit extreme, these are only cars!! > My rev-counter is working.- Hide quoted text - > > - Show quoted text - Another thought, if it is a crank or camshaft sensor, do these faults only occur with a hot engine, or when they are cold as well, that is, would it be evident from start-up? The present fault is only with a hot engine.
From: Mrcheerful on 13 Jun 2010 11:56 4square wrote: > On Jun 13, 3:32 pm, 4square <corde...(a)whsmithnet.co.uk> wrote: >> On Jun 13, 1:17 pm, "Mrcheerful" <nbk...(a)hotmail.co.uk> wrote: >> >> >> >> >> >>> 4square wrote: >>>> On Jun 13, 10:49 am, A.Cl...(a)DENTURESsussex.ac.uk wrote: >>>>> Thus spake Mrcheerful (nbk...(a)hotmail.co.uk) unto the assembled >>>>> multitudes: >> >>>>>> some vauxhalls can have the ecu reprogrammed to remove the egr >>>>>> from the program, unfortunately this only applies to certain >>>>>> models/ecu types. the egr sometimes just gets a bit of coke >>>>>> stuck in it, which is enough to ruin the idle, sometimes it >>>>>> comes out on its own. having the egr working or not does not >>>>>> seem to effect the mot emissions afaik. >> >>>>> Certainly before my GF's car was 'fixed', the engine sounded like >>>>> a diesel when it was idling, and acceleration was uneven and poor. >> >>>>> -- >>>>> Andy Clews >>>>> University of Sussex >>>>> *** Remove DENTURES if replying by email *** >> >>>> Took to garage, with EML on. The analyser read 'coil pack fault', >>>> and no other faults. >>>> Fitter replaced spark plugs with new ones, and fault gone, EML out >>>> and running well again. >>>> Car was OK on way home, and tested it again this morning. OK for >>>> about 20 miles, then when hot, EML on again, and running rough. So, >>>> I reckon a new coil-pack needed. About �100 I think. >> >>>> I find it a bit odd, that the fault went with new plugs at garage, >>>> when the engine was hot at the time. There does seem some >>>> inconsistency here. Does make me wonder if its a bad connection but >>>> that would surely be same when cold or hot engine? >> >>> there is a known fault with the connector to the coolant sensor, >>> vauxhall make a kit of bits with gold plated connectors to cure it. >>> there was also a problem with a bad earth on the ecm. but my money >>> is still on a crank sensor. and crank sensor did not show up on the >>> fault codes on a diesel vectra I did the other day, yet the sensor >>> had no connection through it at all ! and replacing it cured the >>> problems: rough idle, low performance and no rev counter.- Hide >>> quoted text - >> >>> - Show quoted text - >> >> This is getting complicated! Where is the coolant sensor please? And >> what does ecm stand for? >> Gold-plated connectors sounds a bit extreme, these are only cars!! >> My rev-counter is working.- Hide quoted text - >> >> - Show quoted text - > > Another thought, if it is a crank or camshaft sensor, do these faults > only occur with a hot engine, or when they are cold as well, that is, > would it be evident from start-up? The present fault is only with a > hot engine. the crank sensor usually first starts to fail when hot, turning off for about ten minutes will usually restore the situation for a short while. the ecm is what vauxhall call the main computer. the ect is iirc on the top left front of the engine as you look from the front. the wiring fix basically makes the wiring a bit longer and improves the connection, so if the connections are good and not strained then it is probably ok
From: 4square on 16 Jun 2010 12:52 On Jun 13, 4:56 pm, "Mrcheerful" <nbk...(a)hotmail.co.uk> wrote: > 4square wrote: > > On Jun 13, 3:32 pm, 4square <corde...(a)whsmithnet.co.uk> wrote: > >> On Jun 13, 1:17 pm, "Mrcheerful" <nbk...(a)hotmail.co.uk> wrote: > > >>> 4square wrote: > >>>> On Jun 13, 10:49 am, A.Cl...(a)DENTURESsussex.ac.uk wrote: > >>>>> Thus spake Mrcheerful (nbk...(a)hotmail.co.uk) unto the assembled > >>>>> multitudes: > > >>>>>> some vauxhalls can have the ecu reprogrammed to remove the egr > >>>>>> from the program, unfortunately this only applies to certain > >>>>>> models/ecu types. the egr sometimes just gets a bit of coke > >>>>>> stuck in it, which is enough to ruin the idle, sometimes it > >>>>>> comes out on its own. having the egr working or not does not > >>>>>> seem to effect the mot emissions afaik. > > >>>>> Certainly before my GF's car was 'fixed', the engine sounded like > >>>>> a diesel when it was idling, and acceleration was uneven and poor. > > >>>>> -- > >>>>> Andy Clews > >>>>> University of Sussex > >>>>> *** Remove DENTURES if replying by email *** > > >>>> Took to garage, with EML on. The analyser read 'coil pack fault', > >>>> and no other faults. > >>>> Fitter replaced spark plugs with new ones, and fault gone, EML out > >>>> and running well again. > >>>> Car was OK on way home, and tested it again this morning. OK for > >>>> about 20 miles, then when hot, EML on again, and running rough. So, > >>>> I reckon a new coil-pack needed. About £100 I think. > > >>>> I find it a bit odd, that the fault went with new plugs at garage, > >>>> when the engine was hot at the time. There does seem some > >>>> inconsistency here. Does make me wonder if its a bad connection but > >>>> that would surely be same when cold or hot engine? > > >>> there is a known fault with the connector to the coolant sensor, > >>> vauxhall make a kit of bits with gold plated connectors to cure it. > >>> there was also a problem with a bad earth on the ecm. but my money > >>> is still on a crank sensor. and crank sensor did not show up on the > >>> fault codes on a diesel vectra I did the other day, yet the sensor > >>> had no connection through it at all ! and replacing it cured the > >>> problems: rough idle, low performance and no rev counter.- Hide > >>> quoted text - > > >>> - Show quoted text - > > >> This is getting complicated! Where is the coolant sensor please? And > >> what does ecm stand for? > >> Gold-plated connectors sounds a bit extreme, these are only cars!! > >> My rev-counter is working.- Hide quoted text - > > >> - Show quoted text - > > > Another thought, if it is a crank or camshaft sensor, do these faults > > only occur with a hot engine, or when they are cold as well, that is, > > would it be evident from start-up? The present fault is only with a > > hot engine. > > the crank sensor usually first starts to fail when hot, turning off for > about ten minutes will usually restore the situation for a short while. > > the ecm is what vauxhall call the main computer. > > the ect is iirc on the top left front of the engine as you look from the > front. > > the wiring fix basically makes the wiring a bit longer and improves the > connection, so if the connections are good and not strained then it is > probably ok- Hide quoted text - > > - Show quoted text - Finally......fitted new coil-pack, £105 from Euro-carparts, on Monday evening, running OK since. Thank-you all for replies and advice, has been most informative.
From: Mrcheerful on 16 Jun 2010 13:04
4square wrote: > On Jun 13, 4:56 pm, "Mrcheerful" <nbk...(a)hotmail.co.uk> wrote: >> 4square wrote: >>> On Jun 13, 3:32 pm, 4square <corde...(a)whsmithnet.co.uk> wrote: >>>> On Jun 13, 1:17 pm, "Mrcheerful" <nbk...(a)hotmail.co.uk> wrote: >> >>>>> 4square wrote: >>>>>> On Jun 13, 10:49 am, A.Cl...(a)DENTURESsussex.ac.uk wrote: >>>>>>> Thus spake Mrcheerful (nbk...(a)hotmail.co.uk) unto the assembled >>>>>>> multitudes: >> >>>>>>>> some vauxhalls can have the ecu reprogrammed to remove the egr >>>>>>>> from the program, unfortunately this only applies to certain >>>>>>>> models/ecu types. the egr sometimes just gets a bit of coke >>>>>>>> stuck in it, which is enough to ruin the idle, sometimes it >>>>>>>> comes out on its own. having the egr working or not does not >>>>>>>> seem to effect the mot emissions afaik. >> >>>>>>> Certainly before my GF's car was 'fixed', the engine sounded >>>>>>> like a diesel when it was idling, and acceleration was uneven >>>>>>> and poor. >> >>>>>>> -- >>>>>>> Andy Clews >>>>>>> University of Sussex >>>>>>> *** Remove DENTURES if replying by email *** >> >>>>>> Took to garage, with EML on. The analyser read 'coil pack fault', >>>>>> and no other faults. >>>>>> Fitter replaced spark plugs with new ones, and fault gone, EML >>>>>> out and running well again. >>>>>> Car was OK on way home, and tested it again this morning. OK for >>>>>> about 20 miles, then when hot, EML on again, and running rough. >>>>>> So, I reckon a new coil-pack needed. About �100 I think. >> >>>>>> I find it a bit odd, that the fault went with new plugs at >>>>>> garage, when the engine was hot at the time. There does seem some >>>>>> inconsistency here. Does make me wonder if its a bad connection >>>>>> but that would surely be same when cold or hot engine? >> >>>>> there is a known fault with the connector to the coolant sensor, >>>>> vauxhall make a kit of bits with gold plated connectors to cure >>>>> it. there was also a problem with a bad earth on the ecm. but my >>>>> money is still on a crank sensor. and crank sensor did not show >>>>> up on the fault codes on a diesel vectra I did the other day, yet >>>>> the sensor had no connection through it at all ! and replacing it >>>>> cured the problems: rough idle, low performance and no rev >>>>> counter.- Hide quoted text - >> >>>>> - Show quoted text - >> >>>> This is getting complicated! Where is the coolant sensor please? >>>> And what does ecm stand for? >>>> Gold-plated connectors sounds a bit extreme, these are only cars!! >>>> My rev-counter is working.- Hide quoted text - >> >>>> - Show quoted text - >> >>> Another thought, if it is a crank or camshaft sensor, do these >>> faults only occur with a hot engine, or when they are cold as well, >>> that is, would it be evident from start-up? The present fault is >>> only with a hot engine. >> >> the crank sensor usually first starts to fail when hot, turning off >> for about ten minutes will usually restore the situation for a short >> while. >> >> the ecm is what vauxhall call the main computer. >> >> the ect is iirc on the top left front of the engine as you look from >> the front. >> >> the wiring fix basically makes the wiring a bit longer and improves >> the connection, so if the connections are good and not strained then >> it is probably ok- Hide quoted text - >> >> - Show quoted text - > > Finally......fitted new coil-pack, �105 from Euro-carparts, on Monday > evening, running OK since. Thank-you all for replies and advice, has > been most informative. I am glad it works!! |