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Lumpy idle and stalling, worse when hot

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On 06/09/2013 at 16:03, TomBate said:

Hey all, this is my first post on these forums, and I've been reading it for weeks as it seems better than the haynes manual for advice! 

 

I bought the car (51 plate 1.4 mpi) a few weeks ago with no MOT, 59k miles, for £400. I put it through an MOT, and with 4 new tyres and a new spring it sailed through. It seems to have an idling issue, which is worse when hot, although it is a bit shakey normally. Sometimes when the car has been used a few times, it stalls when it has come to a halt (Eg. at traffic lights). I recently changed the coolant temperature sensor, and the thermostat (the old one was broken). This seemed to make the car slightly better, but an hour ago it stalled when I came to a halt. If I start it when its warm, the revs go 1000, then drop to about 600 (engine sounds like its struggling) then it returns to normal, and seems to be fine. After it had stalled today, I drove it home (no problem, seems to perform fine) and then when it was sat in the driveway I revved it to 2000 then took my foot off, it went 2000, 600 (STRUGGLE) then returned to normal. It repeated this after even the smallest rev. Later on I did this, and it just dropped to ordinary revs without the struggle.

 

I have taken the throttle body off (I'll give it a clean) and I'll post some pictures of what it is like now, if someone could tell me if it looks OK or not that'd be greeeaaat :). I've read it might be the idle air control valve, so thats the next step.

 

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Bottom of the throttle, looks pretty oily. There is some oil in the inlet manifold too.

 

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Top of the throttle.

 

Finally, I saw there was a pretty battered looking tube going into the back of the inlet manifold, with a crack at the entrance. I think its brake related, and I read somewhere that this can cause stalling problems? It does make a sort of low whistle as it speeds up, which I assumed was just the noise the engine makes, but I guess it could be the brake vacuum thingy. The MOT guy did reckon the brake pedal poked out a bit far, but he let it go. I  can't see how this'd be heat related, and I imagine this is irrelevant. I'll post a picture though.

 

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This is the entrance to the manifold, looks pretty cracked

 

%7BfileStore.core_Attachment%7D/monthly_09_2013/post-106353-0-46611900-1378479489_thumb.jpg

This is where that pipe enters the brake thing (drivers side of the engine) This area looked a bit damp around the pipe entrance earlier, no idea if this has any relavance.

 

Sorry for the essay, and thanks SOO much in advance for your help. I am at a loss with what to do. It's an annoying fault, because otherwise the car performs and drives beeaaautifully.

 

Cheers,

Tom.

I have exactly the same problem with mine 😞

 

On 11/09/2013 at 16:39, TomBate said:

Right, just adapted the throttle, and I think she's fixed! :)

The idle is still a little lumpy, with the needle moving up and down a little bit, but there was none of that crazy stalling business. I think the lumpy idle is a 1.4 mpi "thing" so I guess I'll learn to love it haha.

 

Thanks SOO much for everyone's help!

 

Tom

How did you manage to fix your stalling problem mate? 

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@mk1Tom I have to say it seems rather unlikely that TomBate will reply, not having visited the forum for almost exactly 10 years. 

Check the things suggested by people who replied ten years ago, and go from there.

 

1 hour ago, Breezy_Pete said:

@mk1Tom I have to say it seems rather unlikely that TomBate will reply, not having visited the forum for almost exactly 10 years. 

Check the things suggested by people who replied ten years ago, and go from there.

 

Ive tried im confused with some of it tbh ive changed maf sensor brake servo pipe is fine, my local garage cannot fix or find the issue either

Mine would stall as a result of frayed wiring to the pre-cat lambda probe. If that helps you at all.

2 hours ago, AnnoyingPentium said:

Mine would stall as a result of frayed wiring to the pre-cat lambda probe. If that helps you at all.

Mine is the 1.4 mpi not sure if i have one, which model is yours?

 

2 minutes ago, mk1Tom said:

Mine is the 1.4 mpi not sure if i have one, which model is yours?

 

 

I have a 1.2 HTP 12v. However @TMBis an ex-1.4 MPI owner so can maybe help here.

Check very carefully the servo plastic vacuum pipe for splits near the connectors.

 

 

 

 

 

Edited by TMB

^ Scrap that. I see it is/was indeed split. I'm distracted at home and can't add much right now.

Edited by TMB

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