Danny-k

Hi, had nothing but problems with Engine starting up. Common problems like everyone else long cranking, blowing out white smoke from unburnt fuel, take 2/3 times to try and start it until it finally ticks over. 

I’ve also had to do the j518 module repair as I lost all lights on the dash and turning the key did absolutely nothing.

when starting the car after the j518 repair. It was still the same as before with long cranking etc. But only worse, as dash lights would flicker (as if the battery had died) but would still start eventually. 

But now there is no crank when turning the key. Light come on dash as they should. But does not even try and start. Just a puff of air from under the bonnet. 

Vagcom states J644 battery control module is faulty. This has been replaced but still states it’s faulty. 

Do I have a bad earth? Bad starter? Anyone had this problem? 

On 10/26/2017 at 7:25 PM, Bigdave1230 said:

Recently the car has been giving the impression of a flat battery when trying to start. It would turnover a couple of times but very very slowly. Turning the ignition off and then on again and the car would turn over slowly and then speed up and start but this may take a few attempts. It gave all the impressions of a poor starter motor. But having fitted one on a previous Q7 I know this is a 4 hour job and even with a decent discount is still over £200 for the unit. So decided to ring a local auto electrician that could hopefully diagnose exactly the part that needed replacing. (Vagcom showed nothing amiss by the way).

 He turned up and checked the car over and said that the cars alternator was charging the battery at around 13.6v. This is a indication of a poor earth and fitted another earth cable from the earth point under the bonnet used for jump starting to the engine manifold. Said he’s fitted loads as it’s a well known problem within VAG that the earths corrode over time and need cleaning. The car now charges at just over 14v and starts better than it ever did less than 2 seconds from turning the key. Turns over faster than my mates 2011 and 2014 Q7’s. Cost £10 for the earth cable and £40 for callout Including 1 hours labour. 

Hope this is helpful to anybody with a similar problem.

 

 

Hi, which cable was replaced. As I’ve been told there is more than one earth cable? I believe I’ve got same problem

Hi did you solve this problem?