Vectra cdti codes

[buttman]

Hi on my 2007 Vectra cdti 16 v a few weeks ago I had a feeling it was using a bit of diesel so put code reader on and was code p0621 generator lamp control circuit and that was alternator so got that done then 2 days ago it was still using diesel so put reader on again and codes p0621 and p0008 generic engine position performance bank 1 someone told me this was timing problem but car starts ok in mornings and was driving ok until today when I was driving along in sixth gear when I went to accelerate the car juddered felt like engine was dropping out let off throttle and tried again and done it again , a few weeks ago I started car and sounded like started was going to fall out and there was no clutch but been ok since anyone know what this could be thanks

[GreenV8S]

Are you planning to fix it yourself?

[buttman]

Yeah I am with help from a mate but depends what it is

[buttman]

Hi went out to car and started it and battery light came on went for a drive and came back but no codes , could alternator be playing up as checked it and got 14.6 volts coming out of it

[GreenV8S]

If the no charge warning lamp comes on there is probably a problem with the charging system.

buttman said:

a few weeks ago I started car and sounded like started was going to fall out and there was no clutch

What does that mean?

buttman said:

using a bit of diesel

when I went to accelerate the car juddered felt like engine was dropping out let off throttle and tried again and done it again

I guess you mean it's using more diesel than normal. How much more?

It seems pretty likely that the fault code is related to the running problems so that is worth investigating. Also, how old is the fuel filter? A clogged filter can cause load related problems.

[buttman]

HHi thanks for reply the alternator had new rectifier and is chucking out about 14.6 volts but when I took small wire off the connection snapped so replaced connector but might not have proper connection , plus on fuel side the computer says it was doing 37.8 mpg on a twenty miles run , but don't know what judder was ? The fuel filter was replaced about 3500 miles ago

[buttman]

Hi been out in car on drive of about 20 miles then came back same distance and computer said 36.9 mpg and when engine is at temp the guage was reading between 80- 85 degrees never goes up to 90 degrees and just wondered if this sounds ok , as I have been reading and seeing that people are getting over 40 mpg on same sort of runs

[E-bmw]

It is cold & it is a diesel, I wouldn't worry about having a slightly heavier foot than someone else, even having heating, lights, and stereo on can make a couple of mpg difference.

[buttman]

Hi ththanks for reply I have got bloke coming tomorrow with a proper diagnostic tool to see what everything is doing and anything at fault yet to be on stateside

[buttman]

Hi bloke came out today put his diagnostic on and said everything was ok apart from egr was not working properly , how can I test to see if it's working ok

[E-bmw]

So, let me get this right.

You have just paid for a diagnosis & now you want another one, he said it wasn't working.

[Matt_E_Mulsion]

It sounds to me like you are looking for problems that don't exist.

[buttman]

Hi no I'm not iv got to know car and I just had diagnostics done to see if it came up with anything , I'm just seeing what the best way is to test egr anyway went out to car this morning and started it and battery light stayed on so switched it off and restarted and battery light stayed off think the wire for light on alternator is loose

[GreenV8S]

When you switch the electrics on with the engine stopped, the no charge warning lamp should come on. When the engine is running, it should go out. Some cars need the revs to be increased above idle before the lamp will go out.

If the lamp doesn't come on at all, there's a good chance the alternator isn't charging.

If the lamp comes on and stays on, there's a good chance the alternator isn't charging.

[Matt_E_Mulsion]

From what you have said it sounds like you changed the alternator because you read a fault code, not because it wasn't charging???

[buttman]

H when the battery light first came on I tested alternator and was only chucking out 13.0 volts put lights on and still the same so took it off and took to auto electric place and they said it was rectifier so they put new one on and put it back on car and started it and battery light was on so switched it off and then started it and it was off so took it to auto electrician and it was charging 14.6 volts but in mornings the battery light comes when first started but when you restart it the light goes out and it will stay out every time you start it

[buttman]

Hi reference my battery light coming on it is strange as the past week it hasn't come on? But I'm going to clean egr and throttle body for the fuel usage problem and if so get a proper egr valve for it

[buttman]

Hi tested egr valve on op-com today at idle the pos command was 100% and pulse rotation was at4% so took it for drive and while under load the pos command was erratic going up and down but if took foot of throttle it went back to 100% and the pulse rotation stayed at 4% all the time is this ok thanks

[buttman]

Hi how do people get plunger out of egr valve as have looked and seems to be a bit of a hassle to get out?