lumpy idle (CAR)

[BigGeeking]

Hello all sorry for car question but need be.

Mrs divetime has a 1.2 clio 8v it’s the D7F engine

It starts fine no issues but as engine temp starts to go up the idle gets lumpy almost like a miss fire and the idle starts to drop to around 700RPM ish.

I have replaced all the plug’s it has had a service Plugs looked good nice colours
When driving there is no issues pulls fine no hesitation just at idle.

All plugs are sparking, cut spark to each cylinder at a time and the engine sound changes with each one. I Have cleaned the throttle body and the idle air valve still no better

Would the valve clearance cause this do you think?
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Bendy "Flip front. I can filter down the M4 while shoving a Twix in my face."
honda CG 125 2001 SOLD-- current Bandit 400--SOLD. current SV650s 2000
MOD 1 ON 20/7/2011**passed** MOD 2 ON 17/10/2011***passed***,,

[Busa1340R]

How is your coolant level? Is the fan cutting in? Could be the head gasket starting to fail . May be worth getting it sniff tested.
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Current: 2010 Suzuki GSX1340R Hayabusa, 2013 Yamaha YP250R X-Max Sport - Previous: Triumph Sprint ST1050ABS, Honda XL600V Transalp, Honda NT650V Dullsville (don't ask!), Kawasaki ZX9R E1, Honda NX650 Dominator, Suzuki GSX1300RKZ Hayabusa, Honda CBR1000FM, Kawasaki GPZ500S, etc etc

[Old Git Racing]

Do you know anyone with a OBD reader that can be plugged in? Might show a fault code pointing to the problem.

OGR
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2022 Tiger Sport 660 2019 Street Twin 2003 K3 gixxer 1000 1998 Srad 600 track hack

[Fisty]

Lambda/Mass airflow sensors gone. Brothers old Peugeot which shares the engine with the Clio did the same.
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TL1000R | Hayabusa | ZXR400 | TL1000S | Bandit 400 V
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[Busa1340R]

[Fisty]

[Clutchy]

Quickly check there isn't a crack in the pipe AFTER the maf sensor, won't take you long, while not directly affected by heat it may cause the pipe to expand and expose the pipe/hole that little bit more to cause and issue and let DAS pirate air in
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Malaguti F12 Phantom-Dead, Suzuki AY50- Dead, NRG power DD LQ, CBR125.
*33 BHP restriction up on 10/12/14* Current bikes/car: SV 650 S/ MKIV GOLF
Guide to pass your test with no lessons!

[Nexus Icon]

Lumpy once the auto choke has opened up?

MAF or attached vacuum pipe.

I would've expected a fault code if it was the MAF itself though. Similarly a failed Lambda sensor (as per other suggestions) would throw a check engine light as well.

Does the engine light illuminate with the key turned but the engine off?
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Greetings from Shitsville!

[BigGeeking]

Thanks for the reply’s

-I have checked the coolant level still on max and no tell tale signs of head gasket.

-Sprayed carb cleaner round the intake side for vacuum leaks but no change that makes me think there is a vacuum leak.

Fisty – I have been thinking the lambda may be playing up. There is no engine lights on I have a scanner OBD2 and there is a OBD2 socket on the car but it will not connect I know the scanner works as I have used it on another car, apparently it has a OBD2 socket but I need a OBD1 scanner to read the protocol on the car (Fuck knows POS)

Bidding on a Haynes manual on the bay but some shit head had me.

Dose any one know of a test or the ohms reading for the lambda sensor could it be coked up and need cleaning

o yeah its a W reg think 2000 year
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Bendy "Flip front. I can filter down the M4 while shoving a Twix in my face."
honda CG 125 2001 SOLD-- current Bandit 400--SOLD. current SV650s 2000
MOD 1 ON 20/7/2011**passed** MOD 2 ON 17/10/2011***passed***,,

[Clutchy]

Hmmm thought all cars from 1996 onwards had to be OBDII compliant [/list]
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Malaguti F12 Phantom-Dead, Suzuki AY50- Dead, NRG power DD LQ, CBR125.
*33 BHP restriction up on 10/12/14* Current bikes/car: SV 650 S/ MKIV GOLF
Guide to pass your test with no lessons!

[bugeye_bob]

Coolant temp sensor (CTS) is shagged, the give away is the "when cold its fine, when warm its crap",
replace sensor and disconnect the battery to reset the ecu when you do it,( yes these still arent nvm`s),
Let me know how you get on.

[cb1rocket]

Can also be a sticky or non functioning idle control valve
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[Vincent]

Might be worth checking out:-

www.gumtree.com/p/for-sale/clio-haynes-manual/1066056923
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[_Iain_]

Could be anything.

My 306 did this, after replacing the plugs, the coilpack, the headgasket & cleaning every other connector in the engine bay it ran like perfect for a 20min test drive then went back to mucking around.

Being french that had some sort of novelty system wherby the ECU was non OBDII compliant and yet it had an OBDII plug on it meaning you couldn't actually pull any fault codes with a laptop at home.

Sell it and run away.
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Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[totalllama82]

Mine and the sister in laws Clio's do this too. Almost like a misfire when hot and idling.

I've replaced 4 coil packs, 4 injectors and the fuel rail. 4 spark plugs too.

Given up as it's fine when it's moving plus, replacing a couple of sensors is more than the car's worth now.

The manifold is blowing on mine so I put it down to the O2/Lambda getting too much fresh air in there and messing up the mixture. Also thought of the coolant temp switch too - i've got a small hole in the rad which leaks coolant slowly (which i forget to top up regularly) - could be that too.
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