Bloody typical

[zinc]

So I put the car up for sale and it starts to play games with me!


Right, it starts fine, 100% normal, first time every time. Then the revs drop and it cuts out! I can keep it going by pulling the choke out but then I get slight pop every so often and once it has settled it is idling a little rough.

Have cleaned the idle jet (well there was nothing to clean as it looked spotless, but 'cleaned' it anyway). Can't hear any hissing or see any split hoses or anything out of the ordinary but the engine is a little shaky.

Any other ideas? Could the plugs be causing this? They're not that old.

[James5]

Air leak, one way valve to breather pipes failed, breather pipes restrictors missing or broken if you are running OE setup, carb base leak, just keep cleaning that big ole brass screw on the side of the carb and squirt some carb cleaner in the hole aswell.

[zinc]

Are the breather pipes the ones that go into the pot near the water pump?

Thanks for the help.

[IANMM]

rev it spray carb cleaner on the pipes carb base etc and when you hear the engine noise change ie go up thats where its sucking in from (air leak)

[zinc]

Awesome will go buy some carb cleaner, thanks!

[Markey Mark (BD)]

Pull the carb elbow off and see if fuel is dribbling down the venturi mate.

[James5]

Pull the carb elbow off and see if fuel is dribbling down the venturi mate.

[zinc]

Just checked that, it is spraying quite nicely from the pipe (is that what I should have been looking for yeh?). Anything else I can try until I get some carb cleaner?

[Markey Mark (BD)]

No you want to see if its dribbling on idle.

Sounds like the acclerator pump jet is fine though.

[IANMM]

wd40 will also work

[IANMM]

has your mixture screw popped out?

[zinc]

Mixture screw is still there.

Will the fuel just be dribbling even with the choke on? Or will I have to wait until it will idle without choke. I'm thinking if the choke is on it'll be doing a bit more than just dribbling?

Will see if I can find some wd40 as my can is low but I have some cleaner due here in about 30 mins.

[zinc]

Right, sprayed carb cleaner about everywhere but couldn't see any noticeable change.

Took the idle jet out and blasted it with carb cleaner, also blasted where the jet came out of. Started it up and it idled fine!

Took it for a quick spin and it cut out but started up fine so got it home and it's back idling funny again.

Is there a gasket behind the idle jet? Can't see any on the carb service thread so hoping someone else can shed some light on the situation please.

On a positive note, refitted the u/j on the steering wheel yesterday as it wasn't 100% straight and it feels much, much better now so that's a good sign.

Thanks in advance.

[IANMM]

replace your fuel filter? sounds like **** is getting into your carb....?

you can also get one of those pre filters to put in before your carb

[zinc]

Hmm I will try doing the same thing again today and see if does the same. No harm in changing the fuel filter either way I guess.

Just checked with Euro carparts, they have 3 for the GT Turbo. £4, £8, £16.

[paul-11turbo]

Hmm I will try doing the same thing again today and see if does the same. No harm in changing the fuel filter either way I guess.

Just checked with Euro carparts, they have 3 for the GT Turbo. £4, £8, £16.

the £4 is fine or go for the bosch for £8, ignore the £16 one thats there to rip newbies off lol.

[zinc]

Not been near the car today but got a new filter.

Haynes says it's just a case of unplugging and refitting.

I take it there is no need to worry about fuel pressure etc?

[zinc]

Replaced fuel filter - still the same.

Took carb elbow off and there was no fuel coming out from here at idle:



I take it I need to do as suggested on this thread:

https://www.rtoc.org/boards/showthread.php?t=16756

[Markey Mark (BD)]

There won't be any fuel coming from there at idle, its the accelerator pump jet it only squirts abit of fuel when you depress the accelerator.

Is it spraying nicely when opperating the throttle?

[zinc]

Yes it is, as soon as I open the throttle it sprays out and idles fine for split second. I can hear a fair bit of hissing with the carb top off and just idling, guessing that is normal?

[Markey Mark (BD)]

Yeah that sounds like the jet is working correctly.
There's no dribble from the carb when its running on idle when its struggling to run?

Wondering if there is a blockage in the main jet and and its struggling to pull the fuel through.

[zinc]

Not sure where I'm supposed to be looking for a dribble. Couldn't see anything going in there (the photo).

Took the main jet out with the help of Sooky a couple of weeks ago to see if it was standard or not and it all seemed okay then.

Think it might be worth just stripping the carb and servicing it using the kit I have? Never done it before but there is a guide on here somewhere.

[Markey Mark (BD)]

When the car is running can you see fuel dribbling down the carb? Normally you won't see this, it'll be very visible if it is.

May be worth just pulling carb off and giving it a decent clean and blow out with an airline, sounds like its got some dirt in there poss.

[Spooky]

Am, probably worth rebuilding the carb with carb gasket kit

That way you can give it a thorough clean in and out.

I have been meaning to pop round but not had the car

[Shane P]

I have been meaning to pop round but not had the car

Where is the car?

[Spooky]

My R5 has been off the road since Jan...due to a combination of getting married/moving house/helping other people/lack of motivation etc...it's been sat there like a lemon

The 172 is currently my daily now...but that will be off to a new home pretty soon hopefully

[zinc]

Right I've 'serviced' the carb, the only bit I didn't do was pull apart the throttle assembly but wishing I did now as it has made no difference at all.

When emptying the carb of fuel I saw it had some particles in it, I would have thought it would have been 100% clear?

Car still starts and won't idle.

I sprayed all of the crankcase hoses again but saw no change so not sure where to go on from here?

[1.7r5gtturbo]

ill upload a pic of an old carb iv got take this screw out and give it a good cleen m8 this should sort the problem make sure there is a seal on it and do it up tite m8 its the idle scre not the tickover screw big one good luck m8

[Markey Mark (BD)]

Right I've 'serviced' the carb, the only bit I didn't do was pull apart the throttle assembly but wishing I did now as it has made no difference at all.

When emptying the carb of fuel I saw it had some particles in it, I would have thought it would have been 100% clear?

Car still starts and won't idle.

I sprayed all of the crankcase hoses again but saw no change so not sure where to go on from here?

How did you clean the carb mate? Not trying to tell you how to suck eggs but i find ony real way to clean them out properly is to blow them out with an air line as this will remove every last bit of dirt.
I wiuld say something is still in there if its not wanting to idle, as you say you've cleaned the idle jet few times already.

Have you played with the mixture screw at all? Is it screwed in quite far or almost hanging out?

[zinc]

I have no issues with anyone pointing out the obvious, I just need it up and running asap, will try anything!

I will post up some pic tomorrow of how clean it is, it's pretty clean but not 100% as I didn't take out the choke flap spindle because the screws looked like they were going to round off, so it was hard to get the walls clean in certain places.

I used a can of carb cleaner (pressurised) and some IPA to clean it with lint-free cloths, I don't have access to an airline any more. I used to have access to an ultrasonic cleaner too, that would have made the job very easy!

I have never touched the mixture screw. The first bit of fiddling I've ever done with a carb was raising the idle speed a couple of days ago.

I will go over everything again tomorrow and double check, I did take my time doing it today but will clean the idle jet again and give the carb another clean.

Shall I get the Dyson on the go, can't blow anything out but might be able to suck it out?

One last thing, do Renault sell the spring that holds the choke cam in place? Mine doesn't seem to want to hook on.

Thanks once again.

[zinc]

[IANMM]

good on ya mate.....thought it sounded like a air leak

[Woznaldo]

Just to make sure this has fixed the problem, can you confirm as I'm having a very similar problem?

[zinc]

Yup, took a while to tweak the carb idle and mixture screw but it idles fine now after the choke has been on for about 3-4 mins.

Took it for a 15 min drive and all seems OK, will do a longer run but it idles fine at the moment.

Don't know how I missed the broken gasket the 1st time but at least I found it I guess!

[Woznaldo]

Yup, took a while to tweak the carb idle and mixture screw but it idles fine now after the choke has been on for about 3-4 mins.

Took it for a 15 min drive and all seems OK, will do a longer run but it idles fine at the moment.

Don't know how I missed the broken gasket the 1st time but at least I found it I guess!

Thanks zinc

[zinc]

Hopefully it's that simple for you Woznaldo!

Forgot to say thanks to all those who helped.

[zinc]

It's back, or at least something similar.


Went for a little drive, floored it in 2nd slowed down for a roundabout and it cut out half way around the roundabout.

Started up fine then drove home and was jerky and now it won't idle and pops loads when letting go of the throttle pedal.


JOY!

[zinc]

Right, I've had a good think about this and....


The car cut out after some heavy braking (was showing my mate how well it stopped) so this means either something had come loose - I checked all leads but will check for more stuff tomorrow - or

Has this got something to do with the vacuum system? Would that stop it idling though?

It was popping a little before the incident but it's popping like fook now.

[Slim]

have you checked the one way valves at the back of the inlet manifold??

[zinc]

Not recently, no. Do you have a photograph of them?

[Jimmy_GTT]

Here it is:

[Tony Walker]

If its popping it means its running very lean. sounds like an air leak somewhere. try checking your inlet manifold nuts are tight. also try clamping the surrounding hoses to see if any are drawing air, it should start to run better when you find the right one. And again spray carb cleaner around the carb , be carefull tho it is flammable.

[zinc]

Thanks - will report back.

[zinc]

I can only seem to reach 2 of the inlet manifold nuts - looks like I need to take the carb off to allow better access?

The oneway valve - this is the crankcase ventilation system, do I check it just by blowing, I'm guessing air should only come out one way, with it being a one way valve and all that.

I've removed all the pipework and can't see any obvious splits. Is there any way I could bypass the whole system or re-route as a way of partition testing?

If the inlet manifold was leaking would I be able to hear something from that area?

[zinc]

Right I've tried blowing down the one-way valve and air seems to come out, regardless of which hole I blow through, there's a bit less through some of the holes than the others though.

And now the silly thing won't start.

[zinc]

Does anyone know if The Master still does work on cars? Don't really know anyone else who I can ask for help.

If so, can someone point me in his direction with some contact details please?

Really don't have the time to keep pissing about with the car.

[Penfold aka The Dealer]

Does anyone know if The Master still does work on cars? Don't really know anyone else who I can ask for help.

If so, can someone point me in his direction with some contact details please?

Really don't have the time to keep pissing about with the car.

I believe he does, best pm him direct on here to get his mobile number etc..

[Markey Mark (BD)]

There's also a one way valve on the brake servo itself, this is a common one for failing too.
Worth swaping that for another one to see if this eliminates the problem mate, i did have spare but used it on another 5.

[zinc]

Ah ha, I was thinking that, forgot to ask where the other pipe went to, the one that goes to the servo.


Wonder if GSF or anyone stocks one. Looks like a bit of a ba$tard to reach.

Thanks.

I have his number now Penfold too.

[Markey Mark (BD)]

Ah ha, I was thinking that, forgot to ask where the other pipe went to, the one that goes to the servo.


Wonder if GSF or anyone stocks one. Looks like a bit of a ba$tard to reach.

There's an easy way to get to it, take the drivers wheel off and also the little section of inner arch. Once thats off its there right in front of you.