Volvo RWD 200 Forum

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556 ECU upgrade to 946, cold start valve? 200 1989

posted by  someone claiming to be Volvo n00b on  Thu Sep 27 15:38 CST 2012 [RELATED]

I'm working on my dad's 1989 244DL with 556 ECU and EGR, and was wondering if an upgrade to a 946 will eliminate need for the cold start valve. The popular ECU table describes the 933 as "Eliminated the need for a cold start injector." but nothing whether the 946 supports old start enrichment through the injectors or a cold start valve. I'd like to keep the EGR operational since I don't know if NOx will be a problem during emission testing. Thanks, Chris.








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556 ECU upgrade to 946, cold start valve? 200 1989

posted by  hardknocks! on  Thu Sep 27 15:46 CST 2012
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last visit: Sun Oct 12 06:42 CST 2014
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hello
put in the computer you should be fine.







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556 ECU upgrade to 946, cold start valve? 200 1989

posted by  someone claiming to be Volvo n00b on  Thu Sep 27 21:51 CST 2012 [RELATED]

I just grabbed a good '933 ECU for $66.00 before someone else did... Didn't find any info out in the wild whether a '946 eliminates the CSV or has any binary advantage over a '933 (except for A.I.R. support which I don't need). But if someone does have '946 and CSV knowledge then please chime in anyway :)
Thanks,
Chris








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556 ECU upgrade to 946, cold start valve? 200 1989

posted by  someone claiming to be Volvo n00b on  Thu Sep 27 15:55 CST 2012 [RELATED]

I haven't bought an ECU upgrade yet and would rather confirm cold start enrichment before buying either a '946 or '933. Looking to unplug/remove the original cold start valve.








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556 ECU upgrade to 946, cold start valve? 200 1989

posted by  hardknocks! on  Thu Sep 27 18:45 CST 2012
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last visit: Sun Oct 12 06:42 CST 2014
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hello
o.k. i see what your saying. i have only read here it works fine.
Dan Page i believe is using this setup and he will probably confirm this.
good luck
Mike







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