Not running smooth anymore

[apywell]

Hi all

I have noticed recently that my 2ltr Diesel engine is vibrating. Perhaps the best way to discribe it would be to say it feels like it is running on 3 cylinders. It is most noticable with the auto in 'N' and rev the engine to just above 2000 rpm. It's rocking the car (engine seems out of balance and not smooth). I do not have a problem starting, or accelerating etc. I don't notice anything when traveling at 70mph when @2000rpm, or any other speed for that matter. It is most noticable when not under load, sometimes at lights when idling I see the rev counter slightly jumping, and not running smoothly (kinda chuggin).

Anyone have similar problem or any ideas what's causing this?

[Simon]

I've heard that loosening and then re-torquing the engine mount bolts can solve vibrations such as this. As you suggest it does it only when in neutral and not-moving I would discount vibrations from wheel-inbalance and suspension problems.

The revs may be just the right harmonic frequency to cause the block to resonate on it's mounts. I'd check these if I were you first. :lol:

[apywell]

Hmm the engine mount bolts eh. Are these easy to get at? Been a complete novice and all....

[Simon]

Hmm the engine mount bolts eh. Are these easy to get at? Been a complete novice and all....

To be honest, I wouldn't know as I've not needed to re-torque mine. Best bet is to buy yourself a copy of the Haynes manual (don't forget you get a discount if you say your a member of this club) and buy yourself a propper torque wrench.

Hopefully the Hayne's manual will give you details on the location of said bolts and the correct torque at which they should be tightened to.

Worth hanging around on this thread for a bit though as someone may know this info already... If not, I'll go and prod someone to see if they can help!

[apywell]

You know something, the vibration isn't that noticable today. In fact I was slowly reving it when I got to work this morning and I didn't notice it happening at all. Then I noticed it a little this evening when I got home. :whip:

I am starting to notice that this car will behave differently from time to time. Perhaps I should stop worrying until something goes 'clunk'. I notice some people worry about the temp guage but sometimes mine it dead on half way (but rarely) and more often it is between a quater and half way.

I also notice that my fan only comes on every 30 secs or so for about 5 secs, then goes off.

Don't know what others think but the car runs great and fuel economy is good and as I don't have about 2K to give to my local garage to fix, I'll not worry too much. :)

[Simon]

I also notice that my fan only comes on every 30 secs or so for about 5 secs, then goes off.

Your fans broke.

No seriously. You have just described the all-time classic symptom of a failed radiator fan. :(

Give me a moment to point you in the right direction...

[Simon]

Right, I've asked someone to come along so hopefuly they (or someone else) will pop along and diagnose your radiator fan a bit more clearly. :lol:

[Keith]

If the fan is stop starting with the aircon on then most likely the low and medium speeds have failed

The Trinary switch in the aircon is then running it at high speed in response to an increase in refrigerant pressure once pressure drops fan stops this stop start behaviour will because of the current drawn also cause a momentary dip in the idle speed.

If you fancy the 70 Mile drive over here at the weekend I can put your car on Testbook and test it but if you have a local dealer they can do the same and it shouldn't cost you more than half an hours labour.

What year and mileage is your car?

[apywell]

Thanks for that Simon.

Hi Keith, the car is 02 and has (thinking....) about 78000 on the clock.

At the moment I have the 'econ' button working the heating. So the fan isn't and issue, and you are right what you say about a slight drop when the fan kicks in. To be honest, I've just bought 4 new tyres, had a full service and the rear wheel bearing done just a month ago and only had the car 5 months (Oh and tax is due at the end of the month). I really could do without spending any more on the car this time of year. Do you think this could wait until spring, as I don't use the aircon during the winter months? If it is a quick fix or something not too expensive then maybe I can do something, but I have no drive and have to park the car in the next street. So you see, I am very limited to what I can do on my own.

Thanks for the offer of Testbook BTW. :)

I was having a nosey through the 'other' forum the other night and noticed some talk about having a meet for a weekend while everyone fixes their 75s. Not sure if this was you Keith or was it someone else. There was talk of camping and all sorts. This would be a great idea for the likes of me...

Anyhow, there's my story so far.....

Oh, just remembered that I am visiting a friend in Shropshire on the 20th Dec. Is this any good for having a look with Testbook?

[Roverron]

Thanks for that Simon.

Hi Keith, the car is 02 and has (thinking....) about 78000 on the clock.

At the moment I have the 'econ' button working the heating. So the fan isn't and issue, and you are right what you say about a slight drop when the fan kicks in. To be honest, I've just bought 4 new tyres, had a full service and the rear wheel bearing done just a month ago and only had the car 5 months (Oh and tax is due at the end of the month). I really could do without spending any more on the car this time of year. Do you think this could wait until spring, as I don't use the aircon during the winter months? If it is a quick fix or something not too expensive then maybe I can do something, but I have no drive and have to park the car in the next street. So you see, I am very limited to what I can do on my own.

Thanks for the offer of Testbook BTW. :)

I was having a nosey through the 'other' forum the other night and noticed some talk about having a meet for a weekend while everyone fixes their 75s. Not sure if this was you Keith or was it someone else. There was talk of camping and all sorts. This would be a great idea for the likes of me...

Anyhow, there's my story so far.....

Maf sensor can also cause this.

Try disconnecting the plug.

Mine doesn't vibrate in neutral but I can produce a mild but audible chuga chuga below 18-2000rpm if I have the maf comp setting on my Synergy in correctly set.

Ron

[Keith]

I was having a nosey through the 'other' forum the other night and noticed some talk about having a meet for a weekend while everyone fixes their 75s. Not sure if this was you Keith or was it someone else. There was talk of camping and all sorts. This would be a great idea for the likes of me...

Anyhow, there's my story so far.....

Oh, just remembered that I am visiting a friend in Shropshire on the 20th Dec. Is this any good for having a look with Testbook?

Yep thats me, It will be next summer if I have one here as my field is too muddy for caravans before mid June

I will be around on the 20th afaik so pm me nearer the time. The testbook is not mine and may have been collected my Mr Lates before then though.

[Lates]

Mr Keith howare you mate ?

Mr Clives T4 is dead so I may be over quicker than I anticipated. Omitec will sell him a new lappy loaded up with OS for £1k !!!!!! He told them to shove it as its only just over a year old and bought a new lappy.Guided from a n other buddy he can still use it as a lappy and a T4. This is the problem he has now all hooked up to a vehicle,T4 doesnt recognise the leads :(
All this happened when hooked up to a V8 and the first time he used the sat nav software disc it blew his mother board/12volt adaptor to bits. Needless to say he not overly impressed atm especially with Omitec. :guns:

[apywell]

I had thought about the MAF sensor Ron and if you can give me an idea where these sensors are located I can have a look this weekend. A pic of the location would be great if anyone can provide.

I thought it was you Keith who said about the weekend. You can count me in as I think this is a brilliant idea and most generous offer to the members here.

Anyhow, I will pm you over that weekend before to see if you are available with the Testbook. :pepsi:

[Keith]

Mr Keith howare you mate ?

Mr Clives T4 is dead so I may be over quicker than I anticipated. Omitec will sell him a new lappy loaded up with OS for £1k !!!!!! He told them to shove it as its only just over a year old and bought a new lappy.Guided from a n other buddy he can still use it as a lappy and a T4. This is the problem he has now all hooked up to a vehicle,T4 doesnt recognise the leads :(
All this happened when hooked up to a V8 and the first time he used the sat nav software disc it blew his mother board/12volt adaptor to bits. Needless to say he not overly impressed atm especially with Omitec. :guns:

The adaptor and or Laptop dying will just be a coincidence if you want to bring it over here I will sort it all out, I have a spare laptop so can use that to get the software working properly, when you say it does not recognise the leads do you mean the red leads etc or the laptop does not recognise the T4 interface via the network cable?

[Lates]

The adaptor and or Laptop dying will just be a coincidence if you want to bring it over here I will sort it all out, I have a spare laptop so can use that to get the software working properly, when you say it does not recognise the leads do you mean the red leads etc or the laptop does not recognise the T4 interface via the network cable?

I believe its a coincidence the adaptor/motherboard has died the second he put in the disc, thats life unfortunately.
As far as I am aware Keith, he has tried to use it on 2 different models which needs two diff coloured leads and neither was recognised. I will find out :
a) if the lap top recognises the interface
b) or is it just the leads

and any other questions you may need to know the answers to.????

Can reset some options on your car at the same time mate ;)

[apywell]

Can reset some options on your car at the same time mate
Hey, some fancy software this Testbook...... :drool4:

The uneven running seems to be back with a vengance tonight..... :mad: