Rich stop on '86 4 ksq- fuel system problem?

[rizov_d at shaw.ca]

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I don’t have a spare ECU or altitude compensator.

Is there any way to test the compensator?



There is something else I have observed:



With engine running and differential pressure current steady at 17,7 mA:



If I close the full throttle switch the current changes to 10,7 mA



Immediately after releasing the switch (open) the current is 7,7 – 8,4 mA but
only for a blink of an eye and changes to steady 17,7mA.



I even tested the ECU side of the connector, mainly for ground or broken OXS
wire, but tests went o.k.



The only thing I can think (beside altitude compensator you suggested) is the
flow meter potentiometer.



Thx,



Dobby





----- Original Message -----

From: Tony Lum <tlum at Gigatronics.com>

Date: Thursday, January 2, 2003 5:31 pm

Subject: RE: Rich stop on '86 4 ksq

>
>
> -----Original Message-----
> From: rizov_d at shaw.ca [mailto:rizov_d at shaw.ca]
> Sent: Thursday, January 02, 2003 3:11 PM
> To: Tony Lum
> Subject: Re: Rich stop on '86 4 ksq
>
>
>
>
>
> Hello,
>
>
>
> Tests I performed and results regarding resistance of coolant
> temperaturesensor:
>
>
>
> Cold: 4.5 kohm
>
> Hot: 225 ohm
>
>
>
> ECU voltage: 4.97 V
>
>
>
> It seems to me that coolant temperature sensor is o.k.
>
> I have to look for the cause of that rich stop condition (17,7 V)
> somewhereelse.
>
>
>
> Any suggestions?
>
>
>
> Thx,
>
>
>
> Dobby
>
>
> Would you happen to have a spare ecu? One last thought is the
> altitudecompensator mounted next to the ecu.
>
> Tony
>
>
>
>