Ph1 172 revs high or fluctuating when the clutch is engaged/neutral

Jekyll · Jul 17, 2015

Hi guys, hopefully you can help.

My revs fluctuate or stay raised once the car is being driven. Stop/start traffic is annoying as it does this. Like the title says, it does it when the clutch is engaged or if I put it in neutral. I've changed the throttle body twice and the throttle position sensor twice.

It had a new genuine cable last year. It had a sticky throttle so that's why I got a second hand TB. I'm now on my 2nd second hand TB but still the same issue. The car has a DIY induction kit on with a breather filter running off the idle control valve. Everything is connected.

Here's a vid which kinda shows it. I do apologise for the stupid accent, I don't actually know why I talked like this!

Thanks, Mark.

Chrisgti6 · Jul 17, 2015

Can't see the video @ work, however - could be an air leak of some sort from your description. Have you had the inlet off at any point?

Jekyll · Jul 17, 2015

I had it set to private but should be ok now. The inlet has been off but I've had this for a while since the inlet has been refitted. It does seem like a air leak but from where?

bashracing · Jul 17, 2015

Remove the idle control valve and clean it,
http://www.google.co.uk/imgres?imgu...d=0CB0QMygAMABqFQoTCMHlvv2P4sYCFREv2wodduULRA

Jekyll · Jul 17, 2015

Have just done it so I will see if that works on the way home. Worth a shot as it was free!

Greeny. · Jul 17, 2015

That accent lol

Jekyll · Jul 17, 2015

bashracing said:
Remove the idle control valve and clean it,
http://www.google.co.uk/imgres?imgurl=http://i239.photobucket.com/albums/ff271/bobinoshoe/clio%2520project/STA60267-1.jpg&imgrefurl=http://www.cliosport.net/threads/where-is-the-icv.561873/&h=600&w=800&tbnid=tY3j_CCO56SQWM:&docid=nOZBgDoFyyotSM&hl=en-gb&ei=cu-oVcHkKZHe7Ab2yq-gBA&tbm=isch&client=safari&ved=0CB0QMygAMABqFQoTCMHlvv2P4sYCFREv2wodduULRA

No luck. All cleaned but get to the bottom of the road and the problem still occurs. Wonder if my idle control valve is knackered?

bashracing · Jul 17, 2015

could be!
did you clean the seat that the idle plunger sits inside the manifold too

TheEvilGiraffe · Jul 17, 2015

Meerkat-tastic.

Jekyll · Jul 18, 2015

Yes it was all removed and cleaned.

@bashracing

bashracing · Jul 18, 2015

As Chris said above its possibly an air leak then,
Lightly spray brake cleaner around the joints between the throttle body all the way through to the lower inlet to see if the revs rise even more, if it does that's the area where you need to re seal.

Jekyll · Jul 18, 2015

I'll give that a go. Got a second hand ICV coming to me next week and I'm going to swap mine with a mate today and give it a quick blast to see as well.

It's just annoying and embarrassing in stop start traffic!

m&l172ph1 · Jul 18, 2015

I replaced the inlet gaskets and the rubber o ring for the breather on mine when mine wouldn't idle. But turned out to be the ICV.

Jekyll · Jul 18, 2015

I've seen them on Renparts eBay page for £35. This is magneti manelli ones. Are they the same as mine says VDO? Don't want to buy a cheap copy and have the same issue!

m&l172ph1 · Jul 18, 2015

They look exactly the same, mine was £50 from euro car parts which was a vdo.

Can't remember what my original was!

dann2707 · Jul 18, 2015

Please talk like that at css

yeecup · Jul 19, 2015

Please change that steering wheel!

Jekyll · Jul 19, 2015

Oh its going Jamie, for sure!

Timmsy · Jul 20, 2015

Just had a thought, should of checked with my ICV while i was up there!

Bit late now though.

Have you secured that breather filter any better?

Jekyll · Jul 20, 2015

I know but Alex was saying it'll make minimal difference.

All I did was tighten up the jubilee clip but I dont think it's that that's causing the issue. I may have a look at the pipe going into the back of the inlet for cracks. Not sure what else it could be.

Jekyll · Jul 23, 2015

Ok I'm certain it's the idle control valve now. Have taken numerous bits off and swapped them over. At lunch yesterday I decided to remove my icv and clean it again.

Upon inspection I noticed that it doesn't spring back smooth. (tye shaft compresses when the throttle is pressed and releases when the throttle is released.)

Also turned out the the threaded part of the bolt was slightly bent. So I straightened it up slightly, being careful as it doesn't seem that strong, and regreased it all up and put it back together. It's still not perfect (which I think is due the sliding side of things) but so much better. I'll get a new one fitted and confirm once I've bought one.

Mr R. · Jul 23, 2015

Good news mate, however a new one from Renault is about £300. [emoji20]

Jekyll · Jul 23, 2015

Have just phoned up Renparts who have a new magneti manelli (not sure if thats correct spelling) one and with discount it came to £40 next day delivery which I've just ordered :smile:

Jekyll · Jul 23, 2015

I got a quote from Renault and with my discount it came to just over £100.

Phase1Dom · Jul 23, 2015

My phase 1 was also having this problem thought it was also air leak or ICV

turned out to be the shaft on the throttle body worn, when the car is revving high try pushing the black part of the thottlebody where the cable sits,if it moves in towards the butterfly and the revs drop. its probably worn the shaft

Jekyll · Jul 23, 2015

It's done it with 3 different throttle bodies that I've got and I've swapped over.

Inequality Street · Jul 23, 2015

He genuinley talks like that all the time guys. What a gay, eh?

Jekyll · Jul 23, 2015

Jekyll · Jul 23, 2015

RyG said:
He genuinley talks like that all the time guys. What a gay, eh?

Genuinely

Rob669 · Jul 24, 2015

Throw the second hand parts in the bin, buy new stuff. Your car is 15 years old same as the other TBs.

Jekyll · Jul 24, 2015

Pretty sure it's not the throttle body/bodies. I wouldn't throw them away, just in case....

I've fitted the new icv. Idles as it should, drives as it should apart from one time that I put it in neutral when coasting and the revs fluctuated a bit. Maybe the car needs to adjust itself? No horrible 2k revs when stopped though

Could be placebo but it seems more responsive on the throttle too.

Jekyll · Jul 26, 2015

Not the ICV. Fitted my new one and at first was ok but the OP issues are still here! :rage:

Jekyll · Jul 31, 2015

I have found the cure for my symptoms. Well for now anyway but I've driven from Essex to Gainsborough with no faults so all is good.

The problem was my old gasket on the throttle body/inlet had been broken and was leaking a very small amount of air. i ordered a new gasket from Renault (£2.20p) and scraped of the old one so it was all clean. Fitted and took it for a quick blast. Idle is normal, revs are normal, car feels normal

DannyR · Jul 31, 2015

I was under the impression they were no longer made, was it on a shelf and forgotten about for years?

I've never been able to get one.

Jekyll · Jul 31, 2015

My local dealership had to order it in as they dont have them on the shelf. That was just before 5pm Tuesday and it arrived by 10am Wednesday.

DannyR · Jul 31, 2015

That's good, I tried getting one a few years back when I built the supercharged one and was no longer available!

Jekyll · Sep 10, 2015

Just to update, the car been fine since so the issue was the throttle body gasket.

Ph1 172 revs high or fluctuating when the clutch is engaged/neutral

South East - Essex

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