Re: [DML] Re: startup video
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Re: [DML] Re: startup video



Bill, sometimes........!

The frequency valve runs at a fixed cycle when cold, un-plugging it 
switches it off. Why can't you understand why that'd change the way the 
engine runs?

You keep pointing out out that you know what CIS stands for. Constant 
Idle System/Speed. And you're now telling us that it's rubbish and that 
you prefer to throw it away and make do with using the brass screws, 
which will give you a fixed amount of air at all times, meaning your 
idle will be slow when cold, fast when hot, and go up and down like a 
yo-yo as your ac cycles. Your problem was a VERY SIMPLE electrical issue 
that I'd put money on being one of the pins under the coil cover. The 
CIS in the DeLorean is elegant, simple and extremely effective, and 
really easy to trouble shoot if you have a basic understanding of 
electrics and a wiring diagram.

The biggest problems I've ever had fixing the idle control system always 
stemmed from someone monkeying around with the original system (pins 
swapped around in the idle speed regulator plug being the most 
memorable). Also it doesn't always follow that trouble idling is a 
problem with the idle control system. Make sure you understand the 
system and that everything else is working correctly first! (this refers 
to a specific car)

Please quit giving "advice" that's actually your own opinion. I really 
do pity anyone who goes out now and tries to disable their original idle 
control system based on your say-so.

My 2p - I'm happy with a DeLorean that hunts form cold as long as the 
lambda system is in warm-up. A quirk of the idle control is that it 
tends to hunt when the mixture is rich... which it will be before the 
lambda system cuts in (engine warm enough). This moment is very obvious, 
because a) the frequency valve note suddenly changes and b) the engine 
instantly goes from hunting to a smooth stable idle.

My former #1458 has my stage 1 performance upgrade and without the 
lambda system, idles as solid as a rock at all times.

Martin



content22207 wrote:

> In theory, frequency valves don't fluctuate until water temp is up. In
> practice, they seem to monkey with the lower chambers anyway. Numerous
> times I've unplugged the frequency valve on a cold engine and had that
> characteristic idle hunt smooth out. Don't know what fails between
> theory and practice, but something obviously does.
>
> Regarding CIS -- you're at the mercy of the idle speed motor & control
> module. Mine stuck closed at a stoplight once. Had to ride the
> accelerator pedal to crack the throttle plates until I could get home
> and throw the stupid thing away. 'Twas then that I figured out what
> the balance screws were for and how to set them.
>
> Why the comment about carburetion? (It's true, but curious since so
> very few of us run it).
>
> Bill Robertson
> #5939
>
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