some hints for cranking and shortly after ?

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landybehr
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Posts: 51
Joined: Sun Apr 17, 2005 3:13 am

some hints for cranking and shortly after ?

Post by landybehr »

Hi,

please excuse my frequent "?" - they´re just an effort to progress faster.

Now temps are low again and I want to improve the cranking. The engine cranks reliably, I always can start it. But, restless as I am, I want it to fire up without long cranking.

- the stepper position on the idle/temp - table is easy enough to determine and not perfectly but well enough set. Is there a "rule of thumb" where to put the cranking stepper position ? something like "take the lowest bin ot that table and open the stepper some further x%" ??

- the engine seems to need a lot of ASE. I read that the highest figure is usually 45%, but I am in high thirties with a handful of °C below freezing point already. I want to use as little fuel as possible all over (every drop counts today :) ) but apparantly I do not get away with low ASE. IS opening the stepper a tad something that has a great impact on ASE-affairs ?? Could I have masked a too rich ASE by having the stepper too much opened or could a wrongly set stepper position mix up the ASE and explain the engine´s need for much ASE ?

- Then there is the ASE taper time - how do I set it right ? Can I see in Megatune when it is still active ?

- I observe that the idle RPM after a hot start is lower than when the hot engine was running for some time. This may be caused by the hot coolant which collects upwards and give me a high coolant temp reading (78°C while the running engine has stready 72°C) while the cylinders may have cooled down. Is there any way to get an even RPM ? This is no major issue, but it can be felt because the sudden drive-off after hot start can give me a hesitation of the engine. I see no way to let the stepper act against this. (which in turn, votes for a closed loop idle :) ).

(edited to improve understandibility)
Range Rover Classic - 4.2V8, c/r 8.9:1, standard - EDIS - KnockSense - Innovate LC-1 - MS-2 (B&G - code 2.883j)(continuous baro)(dualEGO but only one sond used)(stepper IAC)
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landybehr
Helpful Squirter
Posts: 51
Joined: Sun Apr 17, 2005 3:13 am

Re: some hints for cranking and shortly after ?

Post by landybehr »

Thanks Lance,

so I will continue with trial and error (with the slight problem that I´m better in "error" than in "trial" :) ).

One more thing - I notice a somewhat harsh combustion noise when the engine goes from cranking into the "afterstart". I haven´t bothered too much about the leftmost column and it´s upper rows. Could I have put them too rich accidentally so that the engine get´s suddenly a rich mixture for the small time until it enters the idle bins ? Any guideline for these bins (compared to idle bins) ?
Range Rover Classic - 4.2V8, c/r 8.9:1, standard - EDIS - KnockSense - Innovate LC-1 - MS-2 (B&G - code 2.883j)(continuous baro)(dualEGO but only one sond used)(stepper IAC)
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