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Your EZ-K ignition module (in LHD) lives up high on the right side of the pedal assembly. You will need to remove both the footwell and under dash panels as well as the knee bolster plate for proper access. Fairly easy to get at with good lighting, but the mounting bracket can be a bit of a knuckle scraper if you're not careful. I'll sometimes need to remove it when working on the later style square brake switches at the pedal that can be a real pain to remove without breaking the plastic tabs.
That black box thingy on the firewall is a vibration dampener, just a chunk of metal, as others mention. I wondered about it for years, especially with it having a braided ground strap. It's seemingly some kind of design afterthought to deal with harmonic vibrations that showed up at the firewall. I see mention of two additional vibration dampeners supposedly on the fenders up by the headlight assemblies. I can't say as I've ever noticed them.
That "idle compensation relay" was apparently used with certain EZ-117K and EZ-118K systems on '87-'89 740s with B200/230K, B200/230E engines (not North American market). It's shown in manuals living in front of the left strut tower behind the power steering reservoir. Beyond the obvious of it having something to do with idle and being a dotted line optional component, I'm not familiar with its exact function, but ignition module idle compensation is described on p53 in TP30317. It was apparently needed on some engines where the CIS (constant idle system) wasn't fully integrated with the ECU (the way it is in the B230F/FT engines we're familiar with). In the manuals, pin 9 that it's connected to isn't indicated as an input or output, but I supect pin 9 is a secondary load input signal (pin 8 is the primary load input signal from the ECU). It's also connected to the cooling fan motor and climate control system, so possibly had something to do with the magical ECC system available in Europe.
As for your problem in general, you seem to have your heart set on blaming the ignition module, although a flaky rpm governor is really grasping at straws. Amarin concurs with you that it's a definite possibility. It would be nice to be able to temporarily swap one in (a huge advantage for me having two similar 940s). I'm thinking more along the lines of Spook with your distributor and ignition wires. I've had a worn distributor cap/rotor that looked not too bad, but created all kinds of intermittent problems until finally becoming a no start. Any hint of oil inside or at the bottom of the distributor cap from a leaking distributor shaft seal/bushing?
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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