Engine resonance

**Stevebt** · 14-03-2008,12:14 PM

Hi

I have a similar problem with mine, I have noticed that the Inter cooler is Vibrating in its mountings, which are only rubber grommets, if you grab hold of it from the wheel arch the noise stops. As you need to take the bumper off to replace the grommets I will wait until I have some decent time off before I attempt a fix.

**TheMadhatter** · 14-03-2008,12:21 PM

You can feel the vibration right through the car, it feels a lot "heavier" than the sort of vibration I would get from that. There is not much vibration though the gear lever or clutch pedal. It feels like an engine vibration and depends on the revs it's just more noticeable going from 70 - 60. Is there an easy way to check the engine mounts ?

**TheMadhatter** · 30-03-2008,04:03 PM

Ok an update. I took the car to a VW specialist to get a qoute on replacing my now leaking the crank shaft oil seal. They had a listen to it and the mechanic thought that part of the centre silencer had been blown into the rear silencer, and that replacing that should cure the noise.

And

That cured it. Noise levels are back to what they where when I bought the car. However this car was not going to let me fix it that easily

The new centre silence has now started rattling like a bag of bloody spanners. Give it a thump with the engine off and you can hear something rattling inside it. At idle it sounds like the above bag of spanners

Bill hooks

So back to the garage for them to fix that then...and put one that does not bloody RATTLE !

**TheMadhatter** · 04-04-2008,10:12 PM

Garage replaced centre muffler under guarantee , booming noise back. so back to square one as they say.

Any one have any idea *** is going on ? could it be the rubber exhaust mounts ?

This is really starting to get depressing

**FLIPKEY** · 05-04-2008,03:10 PM

Did this specialist garage fit a GENUINE VW part or was it a copy ????

**TheMadhatter** · 05-04-2008,06:30 PM

No I have had Bosal replacements which look identical to the original vw ones, vw wanted £220 for each silencer !!!!.

My local non specialist ( well they do seats work for them) changed the centre silencer which was shot. Noise got better but did not go away. Then when I was getting a quote for the oil leak at the local independent VW garage I mentioned the noise. He had a good look and showed me how the rear was also rattling and that the gas flow was less than it should be at idle. Was advised that having the rear silencer replaced should cure it.

So I had the rear replaced and Bingo noise stopped.

Then the new middle one started to rattle. Took the car back and they swapped it for another Bosal one and on the drive home the booming was back.

I am totally confused

. If the new rear had been blocked by the failing new middle silencer it would have been booming before the change? and not just after. So I am assuming that the new rear box is al right.

The only thing that I can think of at the moment is that its some strange exhaust vibration being transmitted into the cabin through the mounts, or the replacement middle box is faulty as well, which would be very strange. The shot exhuast was vibrating and causing it, and in some way the new one is doing the same. I am going to try changing the rubber mounts and maybe giving it a twist.

After that I am suspecting one or both engine mounts are on the way out and that is causing vibration in the exhuast.

Frankly I am "exhausted" by all this, my once smooth quite car sounds like a chav's car on the inside at the moment between 1600-2000rpm. And having had the noise go away and come back is just

**deano-1000** · 06-04-2008,04:44 PM

Hi TheMadhatter, ref your egr valve, I was under the impression that my egr valve was faulty too, looked at it with engine running ect, couldn't see it moving, then followed all the pipe work, looked in a manual and found the bit I was looking at, the lever that opperates the butterfly, only opperates when you turn the car off, it stops air from entering the bores when engine is switched off. The egr valve itself is inside the casting and cannot be seen unless you take off the air duct. This valve is opperated by the vacuum pump thing that sits on top.

**TheMadhatter** · 06-04-2008,05:49 PM

Thank's for that I had seen it moving when turning the engine off, that will be why then. I am gonna take the car back to garrage who have been doing the exhuasts and see what they think.

**FLIPKEY** · 06-04-2008,06:48 PM

I had the same fault on my 130 sport, vibrations at 1900 rpm then no vibrations at 2000rpm got quite noisy in the end, When I held the tail pipe while someone held the revs at 1900rpm the vibrating stopped, I was told the exhaust was shot by three separate garages, the last garage said live with it or spend 600quid a new OEM exhaust, I decided to part company with veedub.

When you find the problem I recon there will be alot of happy passat drivers
good luck.

**TheMadhatter** · 06-04-2008,06:59 PM

Including me.

Being logical about this, it was fine until the "new" middle box was changed. So taking it back to see what the garage think.

When i bought the car in June it was not doing this, and only started since xmas. Last week it was cured so it has got to be something to do with the exhaust or the way its mounted, or the new box is faulty. Will see tomorrow.