GARY ANDREWS Posted September 2, 2009 Share Posted September 2, 2009 what do you have to do if you havent got the speed sensor connected to the ecu if anything on a 3.9 rover v8.what difference will it make without it cheers gary Quote Link to comment Share on other sites More sharing options...
Dave W Posted September 2, 2009 Share Posted September 2, 2009 I've run a few 3.9 engines with the hotwire EFI and no speed sensor input and have never had any issues. I don't know if anyone's reverse engineered the ECU to see what it actually does with the speed input but I'm guessing it'll be used to effect the extra air valve, perhaps to improve engine braking ??? and maybe to adjust the mixture at cruise ??? I doubt the effect is noticeable though and I've certainly never seen an adverse effect. Some 3.9 hotwires came from the factory without a speed sensor, the ones I've come across also seem to be the ones without lambdas so maybe there is a link there ? Quote Link to comment Share on other sites More sharing options...
GARY ANDREWS Posted September 3, 2009 Author Share Posted September 3, 2009 cheers for that dave, up for more info if its out there Quote Link to comment Share on other sites More sharing options...
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