Quote:
Originally Posted by Bob Kontak
Just for discussion. Another simple test is to check the unplugged O2 sensor side of that connection while the car is running. Let it warm up and it should read between 0.1V to 0.9V. 0.1v indicating lean exhaust. 0.9V indicating rich. You literally can get your idle AF mixture roughly close to 14.7:1 by adjusting the 3mm adjusting screw until it reads 0.5V.
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Bob,
yes with o2 sensor unplugged ... this is a very useful approach to set up the base/initial CO setting and check the sensor. Well almost, cause with this you try to reach the lambda 1 ballpark (swinging between 0.1 and 0.9v) and before cat Lambda 1 on this engine will result between approx. 1.0 and 1.8 CO % vol. (forget about those charts in the www saying lambda 1 or even AFR 14.7:1 equals a 0.0 CO % Vol., even not measured after the cat). Then after re plugging the o2 sensor the duty cycle of the FV should swing around 50%. Just turn the CO adjustemnt screw a bit more CW till you get a swinging about 45% which gives you a noticable plus of enrichment when accelerating.
Nevertheless I dropped that antique design ECU and developed a new ECU device from scratch where only the original Case and its connector/socket exist for a proper plug'n play install. You can set up almost everything and its totally CPU controlled. Even compensating wrong WUR cold pressures are possible. An optimized WOT enrichment is possible via adjustment where wideband sensors are also supported and can even spot and keep a perfect achieved lambda 0.85 when accelerating.
Im using, testing and optimizing it since almost 1 1/2 Years and works nice.
The dutycylce now does not fluctuate with +- 15% anymore but only with small +- 5% and so also a nice smooth non oszillating idle is the result and no more of that "pull" feeling when crusing.
And every state of duty cycle, lambda, engine temp, sensor volt, etc can be checked via a LCD display. To that ECU you can even connect a 5bar pressure sensor signal wire (installed between the WUR and the FD) to for permanent control pressure monitoring.
https://vimeo.com/410685925