Engine pulse at idle

[smithysmith]

Help, ive got an anoying engine pulse at idle on my b7 tdi140 avant, the rpm remains constant it just feels like the engine has a heartbeat?! Ive had a new clutch, flywheel, injectors, and ecu update, and it still does it. Any ideas is there still a fault or is it just something this engine does, its just sooo anoying in traffic.

[elPaulio]

Hey there,

Can you get VCDS plugged into it and see what it thinks the idle speed is doing as it is usually more accurate than the rev counter, might show something up??

Paul :biglaugh:

[a8 tech]

smithysmith[/LEFT];222306]Help,
ive got an
anoying engine pulse at idle on my b7
tdi140
avant, the rpm remains constant it just feels like the engine has a heartbeat?! Ive had a new clutch, flywheel, injectors, and ecu update, and it still does it. Any ideas is there still a fault or is it just something this engine does, its just
sooo
anoying in traffic.
Disconnect the
egr multi plug and see if it resolves the pulse,if so check the duty cycle % AT IDLE also do you have a
dpf filter and is the
aircon on

Also i have seen a rise in failed engine mountings recently which only became apparent after the engines were removed also the oil pump counter balance gears have sheared off,basically the 2.0 pd tdi are crap compared to the 1.9 pd units

[smithysmith]

It does it with the aircon on and off, i suppose i'll have to take it back in to the dealer:aargh4:

[smithysmith]

Whats the egr multiplug, and where is it?

[smithysmith]

Sorry i havn't described the problem very well, more like the engine is shaking, looking at a few threads on here it seems quite a common problem (the dreaded tdi engine shake), is there a known fix yet?

[a8 tech]

replace the egr valve and check there is no fuel/oil mixing from the common tandem pump failure

[Audi_Convert]

Hi, similar thread Ive just replied to...,

"Hi all im a newbie to the forum im due to collect my 1st Audi i have moved over from the dark side (Ford/Vauxhall) the car is a 2.0 TDi estate in white on a 05 plate the problem i have if it is 1 is that when the car is ticking over not in gear it seems to rock every few seconds like a car has gone past you if your parked up (thats the best way i can describe it) is this normal if not what could the problem be it seems like the engine is missing a beat or something
thank you in advance
mark"

My reply

"Mark, I have the EXACT same problem with mine. As it's still in warranty I took it back to Audi for a diagnostic check. They said they didnt find anything wrong. Even does it when warm. Sounds like a common characteristic but one I'd rather not have.

I also own a 2000 Land rover defender td5 and that ticks over smoother.....well....not really but its without the irregularity! "

It is annoying, I agree.

[as-tuning]

It sounds like a posible problem with the amount of fuel injected. If you have access to a vag-com read MVB1 zone 2. This figure should be 5.5. If its low it will require the exhaust camshaft to be adjusted to bring the amount up. This is a last resort repair and things such as egr and fuel supply/pressure problems need to be ruled out first.

[Audi_Convert]

I had mine back to Audi who put it on the diagnostics and came up with nothing :S Apparently a lot do this and am a bit apprehensive to have my Audi remapped with the little niggle.

[macpherson966]

I had mine back to Audi who put it on the diagnostics and came up with nothing :S Apparently a lot do this and am a bit apprehensive to have my Audi remapped with the little niggle.

hello mate my names neil i have got a problem with my audi a4 1.9 tdi 1998 when the car is at idle and is warm the revs drop then rise evry few secounds what could this be and also i have a problem with my indicators when i flick the indicators on the do not work same as the hazzords ive checked bulbs and fuses and the are all fine what could be the fault i would be greatful for any help thank you neil

[c4a5er]

,basically the 2.0 pd tdi are crap compared to the 1.9 pd units
:( oh that's very reassuring a8 tech!

[a8 tech]

no problem

[bezza981]

I've got an 05 2.0 tdi 140 and it does exactly the same thing. I've only had the car 3 weeks and was going to go back to the main dealer about getting it looked at under warranty, but when I mentioned it to my mate who's got an A3 2.0 tdi 140 his does the same as well. So i presumed it was a characteristic of the engine - well thats what the manufacturer would say !!

[MPM]

Could be the Dual-mass flywheel....if there's no other symptoms, then this could cause a 'shudder' on idle

MPM :)

[B8 TDI]

Sounds a lot like the DMF it will do this while youre driving too but you wont notice it then.

As we say in the software industry, it's not a bug it's a feature.

Put it this way without the DMF you will feel the rocking, during every stroke, with it it gets balanced out but it sort of catches up every now and again.

[cjboddy]

Seems like many of us have something in common ....I've just picked up a 2006 A4 Avant 2.0tdi at the weekend with 48k miles. Bought it from an Audi dealership and it's been in the workshop and multipointed and all the rest of it they said. On the way home though when sat in traffic I noticed every now and again on tickover there was a slight judder as if a gust of wind had hit the car.

The car is driving perfect and that's the only thing I've noticed. But from reading this thread and for the fact it's already been prep'd by the garage it's something I'll just have to get used to !

Cheers.

Craig

[WazzaS-Line]

I have an 05 A4 2.0 TDi S-Line and have exactly the same problem, along with an annoying "clutch rubbing". Had a diagnostic done and "no problems".

To be honest I am less than impressed with the Audi, i thought I was buying a bullet proof motor, it seems like this model has a few design faults, Audi are a waste of space.

My mate is a Master Tech at Volkswagen and he is checking it on Saturday, he suspects the DMF. . .

You would think with the amount of cars that have this problem Audi would admit that there is a problem and do a recall ? ? ?

[a8 tech]

It's not always the duel mass,tandem pump failure causing oil to mix with the fuel and sticking EGR flap can also have some part to play in this fluctuation at idle.Again check EGR duty cycle and disconnect the multi plug to see if the this improves the slight judder.
In some cases the duel mass can be checked by looking at the old tdc cut out in the gearbox,if there are signs of Grey grease then its starting to fail which normally can be noticed by intermittent knocking at start up and juddering at idle through the vehicle body.Hard to diagnose over a forum without seeing the fault

[Audi_Convert]

You get more insight into what the problem could be on this forum than the dealerships where the £25,000 producat actually came from! :zx11:

These days its a case of lazy **** "COMPUTER SEZ NOOOOOO" statements instead of people actually trying to find a fault physically and doing a check.

[a8 tech]

Its a good job i am a Audi Master tech then lol

[B8 TDI]

Its a good job i am a Audi Master tech then lol

lol,

unfortunately for every one like you out there there are 10 who just don't give a damn.

[cjboddy]

Well after owning my car now for 10 days I called my local audi dealership (not the naff one I bought it from who don't seem to know what customer service is !) They said that the car should not be doing any kind of judder on tickover and could I bring it in.

It's just been in today and they've replaced the EGR valve, washed and hovered out and quoted me approx £228 for it's service when due.

Lets hope I now have many yrs of low cost trouble free motoring :p

Craig

2006 A4 Avant 2.0 Tdi SE 48k

[Maximus2k3]

I've had my 1.9TDi for around 6 months now, and everything was fine until yesterday, when slowing and dropping to 2nd, there was a 'clunk' under the bonnet. When I next stopped at traffic lights it seemed the engine was vibrating more than normal. This could be felt whilst sitting in the car and visibly seen via the gear knob vibrating whilst in gear. The engine seems to be idling smoothly, and accelerating fine, but there is now this marked increase in vibration at idling, which is very annoying!

Does this sound like the problems listed above? Is it a common problem and can it be fixed? This is my first diesel so I'm unsure of the technicalities!

Thanks!

[a8 tech]

duel mass or driven aux componant like the air con compressor clutch,turn the a/c off and on and see if the vibration clears

[Maximus2k3]

Thanks, A8 Tech - tried that with the air con but no joy. I still get the shaking felt through the cabin on idle - looks like the engine is shaking more than it should in its mounts.

Does this seem like a problem with the EGR valve or DMF? If so, is it a big/expensive job? I have it booked in to an Audi dealer on Thurs but I'm worried I'll get charged a fortune without rectifying the problem!

[a8 tech]

Hard to say from here but don't worry about the dealer just agree a diagnostic time and have a good old chat with the deceptionist and see what happens.Good luck and report back but i think the DMF is gut thought which would be £500 for the part and 4.9 hours labour

[Maximus2k3]

Cheers, I'll let you know how it goes! £500 sounds painful! Hope I can get it sorted before my long drive from Inverness to Bradford!

[Maximus2k3]

Well, the first thing that showed up on the diagnostics was the glowplugs. They replaced them but still no joy. Further investigation found that it was indeed the dreaded DMF. So, a new flywheel and clutch needed, though they can't do it for a week and they have no courtesy cars! All that for £1k!