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245 correct idle after start but high after use 200 1992

uid 60851's pic
posted by  Grey245 on  Sat Oct 3 11:23 CST 2020
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Hi Art,

The "smallish" B200 engine was indeed used for tax reasons (e.g. Italy has a cc based taxing system) or to be able to offer a cheaper entry level engine in some more frugal markets. It was also used in some smaller Volvos, like the 300 series, which never made it to the US. In those it was the larger option, the smaller capacities being engines acquired from Renault.

My 245 was registered in January 1992, so it might actually be a 1991 model.

I measured on the EZK and fuel ECU pins according to https://ipdown.net/jetronic.info/tiki-index.php?page=LH2.4+Pinouts+and+Diagrams, noting that my 245 has no EGR or airconditioning.
I also measured a lot as described in https://vdocuments.mx/lh24-manual-complete.html (TP31361/1).

I don't have a DMM that can measure the duty cycle, however I read a different DC voltage level when it idles high. When it idles at 750 rpm, the voltage is 8.5 VDC and when it idles at 950 rpm, that voltage is 8.2 VDC.

The fuel ECU is a white label -561. And yes, by now I realize I need to find a functional replacement.

Thanks for your help!






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