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Your 3-2-1 code is probably 'False'... 700 1990

uid 18083's pic
posted by  lucid on  Thu Oct 28 11:35 CST 2010
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last visit: Fri Oct 24 12:31 CST 2014
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...based on Service Bulletin # 135 from January 1990 (applicable to '89 and '90 740 and 740GL), which says that 3-2-1 may be a false code, due to a circuit modification related to the Cold Start Injector/valve..

As a quick check, peel back the Cold Start connector boot and see if the Blue-Green + wire has been disconnected, taped off, and replaced by another wire (color unknown) directly from the starter solenoid.

If so, you can confirm the modification by checking for continuity from CS pin 2 to starter auxiliary terminal 15a or 16 down on the solenoid. If there is continuity, the RSR is no longer in the CS Injector circuit.

QUOTE: "As a result of this modification . . . Fault code 3-2-1 (cold start injector) will be permanently stored in the self-diagnostic memory. However the Check Engine Light (CEL) will not illuminate."

10/27/10
I know this doesn't address your current problem, but didn't want you to be chasing a wild goose.
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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New '90 740GL idles rough under load after quick stop that stalled engine. [700][1990]
posted by  mrjoeski  on Thu Oct 21 17:13 CST 2010 >


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