Author Topic: Fluctuating idle speed - B207  (Read 219 times)

Steve McF

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Fluctuating idle speed - B207
« on: 22 March 2020, 07:58:00 PM »
I was advised by a Saab specialist that my fluctuating idle speed may not be to do with the throttle body needing cleaning, but may be something to do with coil packs.

I've managed to order some coil packs fairly cheaply off someone breaking a similar vintage B207 Aero, so when they come, is it worth me swapping the coil packs over?

If so, how easy a job is that?

sgould

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Re: Fluctuating idle speed - B207
« Reply #1 on: 22 March 2020, 08:35:56 PM »
Should take 5 minutes!

But take a little longer and put in new plugs.  A bad plug can shorten the life of a coil.

Remove cover.  Undo connectors and the coils are free to be unbolted and lifted out.  I never did the coils on our car.  I think that you can undo them and lift them out  before disconnecting the electrics if that's easier.  Beware!  The connectors will be a bit brittle by now. Be as gentle as possible.
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aerojon

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Re: Fluctuating idle speed - B207
« Reply #2 on: 22 March 2020, 09:17:18 PM »
1st off i'd be hooking up an obd reader and checking the misfire counts on all the cylinders..

Steve McF

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Re: Fluctuating idle speed - B207
« Reply #3 on: 22 March 2020, 11:13:35 PM »
No fault codes have ever been recorded in the 2 years I've had the car, yet it has had the fluctuating idle throughout.

Audax

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Re: Fluctuating idle speed - B207
« Reply #4 on: 23 March 2020, 04:01:07 PM »
Have you actually cleaned the throttle body?

Start simple, do not replace any coil packs until you have done the basics, replacing a coil pack and cleaning the throttle body at the same time might mean you fix one issue and cause a new one.

Steve McF

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Re: Fluctuating idle speed - B207
« Reply #5 on: 23 March 2020, 07:04:29 PM »
Hi Audax,

I haven't - I was going to book the car into a specialist to have some other things done, and asked if they could clean the throttle body. That was when they said that it wasn't likely to be the throttle body!

The coil packs I just thought I would get as spares, when I saw a car being broken. They'll be added to my ever increasing collection of bits!!!!


aerojon

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Re: Fluctuating idle speed - B207
« Reply #6 on: 23 March 2020, 09:17:02 PM »
No fault codes have ever been recorded in the 2 years I've had the car.

Quote from: aerojon
1st off i'd be hooking up an obd reader and checking the MISFIRE counts on all the cylinders..

carrera

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Re: Fluctuating idle speed - B207
« Reply #7 on: 23 March 2020, 10:50:00 PM »
Buy one of these and give yourself half a chance of doing decent diagnosis without having to rely on a garage - though I'm not sure these or any generic reader can read misfire counts,

https://www.ebay.co.uk/itm/D900-OBD2-EOBD-CAN-Universal-Car-Diagnostic-Scanner-Fault-Code-Reader-Test-Tool/293339639484
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Steve McF

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Re: Fluctuating idle speed - B207
« Reply #8 on: 24 March 2020, 05:37:10 PM »
I have something similar to that, and have never read any codes off any car I've used it on, other than a 1.6 Zafira with an exhaust sensor issue!!!!

carrera

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Re: Fluctuating idle speed - B207
« Reply #9 on: 24 March 2020, 09:52:46 PM »
I've had mine 10 years. It has worked on Saabs, VW, Porsche without issue, but of course only for engine codes. ABS, transmission and airbag systems need the specialist readers
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Audax

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Re: Fluctuating idle speed - B207
« Reply #10 on: 24 March 2020, 10:09:24 PM »
I haven't - I was going to book the car into a specialist to have some other things done, and asked if they could clean the throttle body. That was when they said that it wasn't likely to be the throttle body!

I would find a better specialist, even if it isn't the problem it doesn't require a hardware change and means that it would be sorted. It would be trivial to just do it and replace the gasket which is what I did on my 9-3 a long time back and it distinctly improved the idle.