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 Post subject: S40 ignition idle control Issues
PostPosted: Tue May 01, 2018 6:25 pm 
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Joined: Tue May 01, 2018 6:01 pm
Posts: 3
ECU Model: S40 Pro
Distributor: stealth racing
Firmware Version: 73
Hi there guys, I've looked around for info online and on DTA's site and can't seem to find the info I'm after, I can not seem to be able to get my idle ignition control to work, tried different settings and no joy.
The car is a Golf on K-Jet
ECU is S40 ignition only unit, inputs are air/water temp and map base load with no TPS.
Can the idle control work without a TPS on this ECU?


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 Post subject: Re: S40 ignition idle control Issues
PostPosted: Wed May 02, 2018 1:38 am 
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Joined: Thu Jul 28, 2011 4:10 am
Posts: 838
ECU Model: S100 Pro
No won't work as it will never know when its trying to idle, you could try playing with the default tps value on failure but I think you will draw a blank. Fit a TPS ?

However a good way of getting a strong idle is to have ignition timing of say 15 degrees at 1000rpm and 2 degrees at 1500rpm the engine will just sit between these 2 points. but still best to fit a TPS


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 Post subject: Re: S40 ignition idle control Issues
PostPosted: Wed May 02, 2018 3:30 am 
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Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1070
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
What Rob says.

You can also alter the map rows to have a couple of close RPM values to give a bit more idle control, but that's a bit of a sledge hammer approach.

Fitting a TPS is the best solution.


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 Post subject: Re: S40 ignition idle control Issues
PostPosted: Wed May 02, 2018 3:38 am 
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Joined: Tue May 01, 2018 6:01 pm
Posts: 3
ECU Model: S40 Pro
Distributor: stealth racing
Firmware Version: 73
Thanks for the reply Rob, ok that answers that then. :-( I've restored the car and really wanted to keep it looking as standard as possible from the outside, bolting up a TPS on to the standard throttle body will look pony! I've done a good job of of warm idle 90%, it's cold idle where I have a issue. I did a 'work around' with the water temp compensation adding global ignition which isn't ideal.
My next step was to do as you say Rob and turn default failure TPS valve to '0"


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 Post subject: Re: S40 ignition idle control Issues
PostPosted: Wed May 02, 2018 3:46 am 
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Joined: Fri Feb 28, 2014 1:03 pm
Posts: 1070
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79
I have done what Rob mentioned on my 9A turbo (so 2L KR), and it works very well.
Starts on the key from cold, and idles well.


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 Post subject: Re: S40 ignition idle control Issues
PostPosted: Wed May 02, 2018 4:51 am 
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Joined: Mon Apr 09, 2012 11:08 am
Posts: 52
ECU Model: S80 Pro
Firmware Version: 62
It's a long time since I saw a k jetronic system but didn't they have a switch on the throttle body to detect a closed throttle? A couple of resistors could be added to the wiring to give a valid signal and it would still look OEM.


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 Post subject: Re: S40 ignition idle control Issues
PostPosted: Wed May 02, 2018 4:53 am 
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Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2883
Location: Norn Iron
ECU Model: No ECU
Fit a TPS sensor at the pedal then...not ideal, but still functional.


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 Post subject: Re: S40 ignition idle control Issues
PostPosted: Wed May 02, 2018 10:24 am 
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Joined: Tue May 01, 2018 6:01 pm
Posts: 3
ECU Model: S40 Pro
Distributor: stealth racing
Firmware Version: 73
stevieturbo wrote:
Fit a TPS sensor at the pedal then...not ideal, but still functional.


Good idea, been looking at different sensors and mounting opinions.


Mr Drew wrote:
It's a long time since I saw a k jetronic system but didn't they have a switch on the throttle body to detect a closed throttle? A couple of resistors could be added to the wiring to give a valid signal and it would still look OEM.



yes there is a close detect switch on my K-Jet throttle body, that sounds like a nice easy work around to the TPS.

Thank you for all the replies guys!

Here's a few pics of the motor.Image[/url]ImageImage


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 Post subject: Re: S40 ignition idle control Issues
PostPosted: Wed May 02, 2018 11:00 am 
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Joined: Tue Aug 02, 2011 12:08 pm
Posts: 2883
Location: Norn Iron
ECU Model: No ECU
Some Mercedes use a linear pot hooked up to the pedal which would be easier adapted to a cable setup than a typical rotary pot


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 Post subject: Re: S40 ignition idle control Issues
PostPosted: Wed May 02, 2018 3:02 pm 
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Joined: Fri May 30, 2014 7:36 am
Posts: 69
ECU Model: S60 Pro
Distributor: mosley rolling road
Firmware Version: 66
Why don't you set the idle by timing. Set the idle on the mechanical stop to say 1500 there use the timing to control it to a set value. Leave the main map alone


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