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Author Topic: Lumpy cold idle  (Read 26484 times)

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chrisr

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Re: Lumpy cold idle
« Reply #15 on: 09 February 2023, 07:09:43 »
No, I don’t think it’s a previously discussed car, no it has been buggered about with and it had a new manifold a couple of years ago.
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Doctor Gollum

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Re: Lumpy cold idle
« Reply #16 on: 09 February 2023, 10:15:32 »
Quote from: chrisr on 09 February 2023, 07:09:43
No, I don’t think it’s a previously discussed car, no it has been buggered about with and it had a new manifold a couple of years ago.

This thread started off about the rough running of two different cars.

Are you saying that this is a third car ???

I would consider a new manifold buggering about with.

It’s hard enough to diagnose issues remotely without having each question added into the last one about different cars.
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chrisr

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Re: Lumpy cold idle
« Reply #17 on: 09 February 2023, 11:02:15 »
It was running fine both with the previous cracked manifold and with the new one, that’s not the issue. I believe it was you who suggested a coolant sensor problem so I bought a new one but couldn’t locate where it went. I wasn’t aware of two other cars with the same problem. Sorry to have disturbed you, I’ll try somewhere else.
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Doctor Gollum

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Re: Lumpy cold idle
« Reply #18 on: 09 February 2023, 11:43:43 »
Not trying to be unhelpful.

Apologies, I think I may have confused this car with the two of another Chris, both four cylinder cars running rough.

I only realised this when I went to link to that thread :-[
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Doctor Gollum

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Re: Lumpy cold idle
« Reply #19 on: 09 February 2023, 11:46:38 »
So, from the beginning...

Did you find any split or blocked breather hoses?

Any codes to suggest that the ECU coolant temp is not accurate?

Presumably the exhaust manifold was the one replaced?

Any evidence of an exhaust leak? Erroneous O2 readings when cold from the live data?
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chrisr

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Re: Lumpy cold idle
« Reply #20 on: 20 November 2023, 13:36:28 »
I had the inlet manifold and throttle body gaskets replaced and all is now well. Still couldn’t find where the coolant sensor goes!
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Doctor Gollum

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Re: Lumpy cold idle
« Reply #21 on: 21 November 2023, 00:41:58 »
You couldn't or the place that did the work couldn't locate either coolant sensors ???

Both sensors are at the back of the head and don't require removing anything to access them.
« Last Edit: 21 November 2023, 00:44:35 by Doctor Gollum »
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chrisr

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Re: Lumpy cold idle
« Reply #22 on: 21 November 2023, 09:38:58 »
I couldn’t locate one, let alone two! But then it wasn’t that anyway….
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Doctor Gollum

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Re: Lumpy cold idle
« Reply #23 on: 21 November 2023, 11:29:42 »
Quote from: chrisr on 21 November 2023, 09:38:58
I couldn’t locate one, let alone two! But then it wasn’t that anyway….
https://www.proxyparts.com/car-parts-stock/information/engine-code/y22se/part/cylinder-head/partid/15399511/

The lump on the back of the head is the coolant 'bridge' The black plug is the ECU coolant temperature sensor. The dash temp sender has either a spade or button terminal and should be close by.
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chrisr

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Re: Lumpy cold idle
« Reply #24 on: 27 January 2024, 00:18:01 »
Finally sorted this problem (I hope!) Turned out to be a sticking butterfly in the throttle body, cleaned it all out and lubricated the butterfly and all is well. Now I have done this I wonder if there would be any benefit in putting on a new throttle body, or should it be ok now?
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Re: Lumpy cold idle
« Reply #25 on: 27 January 2024, 11:51:26 »
The four pot breather system is more fragile than the V6 one as there's no breather bridge to collect the sludge... It all builds p in the TB and cam cover.

Replacing the TB with a brand new shiny one will have one single benefit... It will take longer to sludge up.

Basically, if you regularly and thoroughly clean the breathers and TB as per the guide then you should never have a repeat of this problem.

Coolant temps not withstanding as sensor failure will have the sum total of absolutely nothing to do with a misbehaving throttle.
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Jimbob

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Re: Lumpy cold idle
« Reply #26 on: 28 January 2024, 09:44:41 »
You could add in a firetrap, which helps with this iirc.  long long time since I had a 2.2
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chrisr

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Re: Lumpy cold idle
« Reply #27 on: 11 March 2024, 23:08:27 »
Update: having cleaned and lubricated the throttle body and thinking this had solved the problem, it came back again. I put a new throttle body on and immediately had a smooth tick over from cold and it would seem much better fuel consumption. I even saw 36 mpg as an average from Surbiton to Rushden and back, well pleased with that.
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Doctor Gollum

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Re: Lumpy cold idle
« Reply #28 on: 12 March 2024, 07:58:01 »
Quote from: chrisr on 11 March 2024, 23:08:27
Update: having cleaned and lubricated the throttle body and thinking this had solved the problem, it came back again. I put a new throttle body on and immediately had a smooth tick over from cold and it would seem much better fuel consumption. I even saw 36 mpg as an average from Surbiton to Rushden and back, well pleased with that.
:-X

Did you clean the cam cover and breathers from the sump to the TB  :-\
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chrisr

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Re: Lumpy cold idle
« Reply #29 on: 18 March 2024, 19:18:02 »
Cam cover was done a little while ago when I changed the gasket, all breathers cleaned that I could find.
« Last Edit: 18 March 2024, 19:20:29 by chrisr »
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