Australian Falcon Member
Join Date: Jun 2001
Location: Western Australia
??? - Oh, I think I see where you're comming from. It's easy to overestimate the complexity of how the EEC5 operates - you're making the error of figuring that the ECU tracks the precise position of the cam - which it doesn't.
That CMP sensor is not a precise cam position sensor - it simply provides the ECU with a cue as to when #1 piston is comming up to TDC on compression (the crank sensor just tells it when the piston is on TDC, not which stroke it's on) - so when you shift the cam around you don't have to worry about making sure that CMP sensor follows it - it will still be giving the ECU what it needs.
All you need to do to change the cam timing with an adjustable gear is loosen the adjustment bolts/screws on the cam gear, then carefully move the big bolt head in the centre in the direction you want to change the cam timing - ie. this will rotate the cam slightly either in the direction of rotation of the engine (advanced) or opposite to rotation direction (retarded).
As far as ignition timing goes, I'm pretty sure the EF timing is run by the ECU from it's precise reading of engine TDC - which it does get from the crank position sensor. Hmmm - with that in mind I'd guess it's not possible to actually change the base timing on an EF. The only other possiblility is that the CMP sensor is involved in setting timing - if that's the case then it's still not directly linked to or affected by where the camshaft is and will still provide the ECU with a suitable feedback for working out which stroke #1 is on even if it's moved around somewhat.
IT'LL GO OR IT'LL BLOW!!!
Last edited by EDFUTURA; 07-25-03 at 01:02 AM.