QuattroMark

Diesel !

Hi Bradley I have full VCDS, however there is no fault code generated. I also seem to remember that the starter on a B7 is not the easiest thing to get to. I have tried to start it a couple of times earlier today (while engine still hot) and it was ok - lets see what happens when I try later tonight on a totally cold car. Mark

So I've had a busy weekend with the A4 - cleaning EGR, changing injectors and such like - but it seems I now have a completely different and I think unrelated problem. After been smug with myself yesterday for curing a very lumpy tickover, the car would not start this morning. When I turned the key the starter motor operated but it was like it was not engaging with the flywheel - tried it several times, occasionally it sounded to engage with the flywheel for a second or so then I would just hear the starter turning. This went on for 20 minutes - eventually it fired up and ran faultlessly. Does this sound like the starter motor shaft not extending far enough? Mark

So once I sat down and thought about this, I realised there wouldn't be any 'slack' to take up - the adjustment screw is purely there to allow for expansion due to heat. I was presuming it was there to adjust when the injectors get pressurised...DOH! Anyway, car runs much better now and the injector deviation quantities are much closer than before. As a precaution I also stripped and cleaned the EGR - what a load of gunk in there! - I am getting spurious readings on VCDS regarding the duty cycle - even at idle it sits at 99.9% where it should be 60-90%. All readings regarding the EGR are out of spec - I am now thinking this is to do with the remap I had a few years ago. Mark

So moving on from a previous thread........I have now replaced what has been described as a faulty injector. Bit of a swine to get out, but finally managed to do it - replaced the 'faulty ' injector with a replacement and put everything back together. Now the tricky bit - I came to set up the injector cam and found that when the cam is at its highest position the lobe is already being pushed tight against the top of the injector, so I can't wind the adjustment screw in to take up any 'slack' - Ive also noticed that this is the same for the other (untouched) injectors - this doesn't seem right to me

I've just noticed that your earlier post says your Torsion value is -0.5. Is yours a BRB engine? - if so spec for that should be 0 to 0.5. Mark

any update with the gearbox mount? Interestingly my car has been laid up for 3 days while I have been away, started it up this morning and it ran like a dream - not the slightest bit of judder.

The thing is is that it is not constantly like this - sometimes all the injectors are round about .09 and the car runs fine.

Those figures look fine - I have 1 cylinder which is hitting 2.99!!!

Have a look at Group13 in the Engine tab in VCDS - this will give you the injection quantities deviation - The figures should always be pretty close to each other - anywhere from -0.5 to +0.5 is good. If you have an injector problem it will show something upwards of 2.0

The belt is coming up to 60K miles - Just out of curiosity....how do you check and adjust the timing with VCDS?

Hi Darren, I was under the impression that it was not possible to change the timing in VCDS - because it is a PD car - there is a Torsion Value measurement ( see below) which will give an indication if it is out - I believe there is a small amount of adjustment on the pulley which can bring this value back into tolerance- however, not had chance to see this yet so I am prepared to be shot down in flames!! The Torsion Value of -0.5KW is within tolerance so it seems the timing is ok. However, Injection Quantity is all over the place, cylinder 1 hit 2.99 mg/str at one point - I checked EGR measurements, again they seem to be all over the place. You can just see (before it faded away) what the specification should be at idle - its miles off. Possibly have a clogged EGR?? This screen shot shows how excessively out it is. Finally did some Advanced measuring on the cylinders, you can clearly see cylinder 1 is wrong. I'm going to do a Purge clean of the injectors to see if this helps - I'll also pull the EGR and clean it Mark

I stumbled across an independent Audi specialist at the weekend - he took 1 look at my A4 and said that I needed the timing belt changing - he had seen this issue many times and went onto tell me EXACTLY what my symptoms were when the car wasn't even running - 'apparently' my issue is with the exhaust valve timing - you need to use something like VCDS to complete the timing belt install. Anybody heard of this? - surely the exhaust valve timing cant be out on its own - only a change in the cam lobes could facilitate this? Is there a function on VCDS that checks timing? Mark

Thanks Steve - I'll certainly try and get to more shows with the Quattro!

No problems with the oil pump Darren - and to be honest I did think about cam lobe wear but the noise is not constant, it changes....need to have a look at it really-

Thanks Trevor - she is my pride and joy, had her 24 years now!!!

I'll stick more up later - oddly enough I don't have ANY on my phone!

Taken at a recent classic-audi meet - mines the 1 on the left - the other is a stunning example of a non turbo quattro

She's just about to come upto 225K!!! - gets well looked after - oil and filters every 9000 miles - generally bomb proof!!

Hi Darren, Air filter fuel filter have just been done - and the EGR and Turbo were replaced 2 years ago - suppose the EGR could be gunged by now though - will strip it down and clean it. It doesn't really smoke while standing - just on initial start up and when its booted hard - if its just sat ticking over its barely noticeable. One thing I didn't mention was that on initial cold startup its quite loud - 'tractorish' as one of my friends commented! and then after about 15-20 seconds the engine tone changes - almost like some sort of valve/flap is operating. I've used Diesel Bob before on my B6 - good guys! Mark

My A4 feels like it has a bad misfire - when being driven on the road I sometimes get a 'hesitation' then that goes away - when the car is stationary it is really noticeable, the whole car shakes. On start up from cold there is a cloud of smoke ( not massive but its there) but the car starts no problem first time - on start up from hot sometimes it takes a couple of goes. If when I am driving and the gearbox goes into kickdown (auto) there is a big black cloud comes out of the back!! I pulled the codes with my VCDS and I got P0301 which is misfire cylinder 1 - I also looked at the live data on the injection quantities and cylinder #1 is out side the standard delivery rate at 2.96 mg/str. I have just ordered a compression tester (hopefully here by the weekend) so I can check if there is anything wrong in that department - just don't want to shell out £500 for an injector that may not cure my problem. Any thoughts? Mark

Just popping by to say hello!! My daily run around is an A4 B7 (2005) Avant TDI Auto - its an absolute workhorse with 225K on the clock and has not been a minutes bother! I'm a member of a couple of other forums - mainly to do with my 1986 quattro turbo.