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Eratic idle

riddlemethis

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#1

My car has certainly been keeping me busy this month with one thing and another.

Ive been getting slightly erratic idling on start up. On cold it idles at around 1 notch over the 1k then reduces to around 1 notch below the 1k but it will fluctuate ever so slightly up & down. I can also feel there is something not quite right through the vibration of the car. After a drive it all seems a lot better but still an ever so slight fluctuation.
I have just removed and cleaned all the sparks and they were actually all tip top condition.

I have just read the stepper motor maybe a possibility?

Orangebean

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#2

Any fault codes reported? Nice list of things to check follows...
Air filter, MAF clean, air leaks in inlet pipe, free play in throttle cable and... IAC valve. Idle sounds a bit high. Mine (GEMS) sits around 750 hot or cold. You've got a Bosch so that might be different.

Martyuk

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#3

If it's a Bosch model, then the MAF sensors don't seem to clean up aswell as the GEMS ones do, but can cause the issues you are having.

It could be a whole load of things. Mine idled a bit like that when the fuel trims were pulled too far from normal, so it was running rich the whole time and that was causing unsteady idle.

Originally it was a bad MAF, but bad O2 sensors can also cause it.

Bosch models don't have a stepper motor like GEMS do, so probably not likely to be that as the IACV works differently. It's worth giving it a clean up though to be sure...

dave3d

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#4

I misread this post, I thought it said Eric Idle.

Orangebean

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#5

Erotic idle?
dave3d wrote:

I misread this post, I thought it said Eric Idle.

Martyuk

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#6

Orangebean wrote:

Erotic idle?
dave3d wrote:

I misread this post, I thought it said Eric Idle.

Is that where it's vibrating a bit more than it should? Mine does that at highway speed, and it's definitely not pleasurable! well, not for me anyway!!

Orangebean

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(Last modified: by Orangebean)
#7

More of a description of a girlfriend I had many years ago :-)

Martyuk wrote:

Orangebean wrote:

Erotic idle?

Is that where it's vibrating a bit more than it should? Mine does that at highway speed, and it's definitely not pleasurable! well, not for me anyway!!>

dave3d

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#8

Load of perverts on here. Ha Ha

Gilbertd

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#9

Martyuk wrote:

It's definitely not pleasurable! well, not for me anyway!!

But haven't you noticed the smile on your missus's face?

Martyuk

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#10

Gilbertd wrote:

Martyuk wrote:

It's definitely not pleasurable! well, not for me anyway!!

But haven't you noticed the smile on your missus's face?

Supposed to have eyes on the road aren't you?? though you can tell there is something else purring that isn't the V8 under the bonnet...

riddlemethis

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#11

Which side is bank 2 sensor 1. Just had a fault code P0154.

Orangebean

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(Last modified: by Orangebean)
#12

Drivers side UK <br>
Cylinders 1, 3, 5, 7 - LH side of engine [Bank 1] <br>
Cylinders 2, 4, 6, 8 - RH side of engine [Bank 2]

riddlemethis

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#13

Thanks, Assuming O2 sensor 1 is at the front.

Orangebean

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#14

Yep- pre cat

riddlemethis

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#15

Should I stick with a Bosch sensor currently about £70 or an Intermotor for £38. They reckon the Intermotor is a premium brand with 2 year warranty but Its the first time iv heard of that brand.

Orangebean

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#16

I run a GEMS so no direct experience for Bosch, but I know the Bosch systems are fussy when it comes to MAFs and lambdas, so I'd go for Bosch. <br>
Don't pay £70 though- try here http://www.island-4x4.co.uk/oxygen-lambda-sensor-0002-mhk100940g-p-7771.html

riddlemethis

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#17

I'd noted that one but wasnt sure if it was just a stock photo or actual Bosch as it doesnt state Bosch just OEM quality.

Orangebean

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(Last modified: by Orangebean)
#18

I'd give them a bell to check. Avoid anything supplied by/ branded Britpart. If you dig into it, the Intermotor ones are supplied by Britpart. Have a look at the URL for the Intermotor one from another supplier : <br>
https://www.lrdirect.com/MHK100940-supplied-by-britpart-branded-britpart.html

riddlemethis

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#19

Yeah, Ive learnt my lesson with Britpart.

Morat

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#20

I bought one of those. It came in a Bosch Box, if that helps.
£61 by the time you've paid VAT and delivery.

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