Juddering

[petef75]

Hi,
I asked about this a few weeks ago and many people said it was a 'normal' cold starting 172.
Since then it seems to be getting worse. If I let the revs drop just below 2000 when I put my foot back on the gas the car judders and splutters until I give it a blip and its ok again, does this even when upto temp, any ideas? It's annoying the hell out of me as well as a bit worrying.

 

[nd-photo.nl]

Idle Control Valve which doesnt work properly?

 

[petef75]

I really don't know, I'm far from being a mechanic lol. People have said air filter, has a cone filter on. It almost feels like it has a blockage in the exhaust if that makes sense? Has a straight through Powerflow, could it be anything to do with this? It didn't start doing it when I fitted the exhaust though - confused

 

[nd-photo.nl]

Clean throttle body, check the Idle Control Valve. Also, are your spark plugs ok?

 

[petef75]

I have spark plugs on the way, I bought them and then read the forums, I seem to have bought the ones everybody hates - Bosch Supr4? I don't know how to check idle control and I also didn't realise the plugs where so difficult to change. I don't want to make anything worse, yet need to learn

 

[Simon_16v]

My car did this recently and I changed the spark plug leads and have had no issue since. Before it was almost like a misfire under 2000rpm for me.

 

[petef75]

Yes Simon, maybe I have used the wrong word saying judder, more like a misfire or hardly any power, a choke almost then fine

 

[Simon_16v]

For the sake of £20 I'd try another set of leads, mine had done almost 117k and were over 10 years old.

 

[Chrisgti6]

And don't bother with the spark plugs you've bought. Send them back and get a set of the proper NGK's

 

[petef75]

Mines done 108k so new leads it is then. Yeah Chris, I noticed everyone uses NGKs, should've checked on here first I guess. I have to repair my bumper, light and wing too, had a cat run out on me, road works left loose stones and dirt, I slid, lost to a concrete post

 

[Chrisgti6]

Should've just hit the cat tbh!

 

[petef75]

Yeah I thought that but it was a neighbours. Got all the parts on the way, cost a bit but these things happen I guess

 

[LeeRS]

Does it bounce you up and down when sitting still in traffic or at lights?
If so, mine is doing this. Very annoying.
How do you check idle valve?

 

[petef75]

No Lee, mine is more like a choking/mis fire, I asked about the idle valve, waiting for someone to point it out. Could yours be engine mount?

 

[LeeRS]

Could be. Have had it checked at a garage and they said it was ok. I'm not convinced they checked.

 

[petef75]

You never know with some places, I had one break but mine shuddered when I was braking, guess its different for which one has broken, if that's the cause. The guys on here will know a lot more than I do lol

 

[nd-photo.nl]

I bought this as replacement for ICV and sofar so good...
http://www.aliexpress.com/item/Free...R-FIT-FOR-Renault-Clio-Espace/1194241502.html

New Idle Control Valve by Andy Ramdin, on Flickr

 

[LeeRS]

what does that do exactly?

 

[ADS_V6]

mark 2 172s dont have an icv?

 

[nd-photo.nl]

It takes care of idling. But as ADS1982 says, first make sure you have one...

 

[ADS_V6]

only the mark 1 172 has a icv

 

[nd-photo.nl]

Then never mind my comment

 

[LeeRS]

Have checked all the engine mounts, all fine. Have had the plugs and leads replaced today and I still lumpy. What next? Are these just lumpy in general and I'm trying to cure something which is normal? Here's a video of how it sounds. Quality isn't the best as the file was to big so had to compress it.




The car shakes to the sound of the exhaust... I don't know how to explain it lol.

 

[ADS_V6]

lee have you maybe got a leak somewhere,my idle is rumbling more aggressive and found out 2day my cat joint is blowing slightly

 

[LeeRS]

I had it all sleeved from the cat back. Could be from the manifold to cat. Will have a check.

 

[ADS_V6]

sorry thats what i mean on mine,manifold to cat is blowing causing a rumble on idle,renault wolverhampton was 19 delivered mate

 

[LeeRS]

19 delivered for what? The clamp?

 

[ADS_V6]

the fititng kit for the cat to manifold bit thats prone to failing

 

[LeeRS]

drove down the lanes this morning to work. Is defo a lot smoother to drive with new plugs and leads.
Idle is "better" but not perfectly "smooth". Feels like a different car now. The plugs that were taken out were LPG ones lol.

 

[LeeRS]

the fititng kit for the cat to manifold bit thats prone to failing

can I see this from under the car easily without it being on a ramp?

 

[petef75]

I replaced my plugs and the choking has gone, a lot better but it still starts to 'rumble' and shake a little at idle when warming up, after about 20 seconds of starting up, I'm guessing this is just normal?

 

[LeeRS]

mine does same. just learn to live with it.

 

[Mike Lane]

Going to throw this in there. Is it the timing?