What is this mystery wiring...?

What is in the blue box, its not oem thats for sure

 

pull the fuse. If nothing bad happens, get rid of the contraption.

 

Could it be a electrical fuel cut off? in the last picture it looks like its plumbed into the fuel line. or it could be a pressure data recorder? don't know why it would need such a big shunt resistor on the buckhead thou.

JIm

 

It’s clearly the control module for the ejection seat.


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Are you sure it is not injecting fuel into the exhaust, flames out the back setup ?

 

That modification is for "federalizing" a euro version (K-Jet without Lambda) for US importation. It's the addition of a frequency valve (run by an added ECU) to slightly change the warm control pressure and provide a sort of "with Lambda" functionality that the US version has. There should also be an O2 sensor mounted in your exhaust stream which is also electrically connected to that same added ECU (if it's all still actually working). If you do a search on "quasi-Lambda", you'll get some prior threads on the topic. Many euro F models from the mid-80s got this modification when brought into the US. (Don't recognize your added ECU brand, but some other added "Lambda" ECU brand names were DC Johnson and Neutronics.)

The large "gold" thingy is a low-resistance, high-power resistor probably suggested to be added into the +12V line going to run the added ECU to reduce any electrical noise on that line (if present).

 

Yes, it's the same frequency valve (AKA metering valve). Sometimes it wrongly gets called a "fuel injector". A better (but maybe less flattering) description would be "a controllable leak". The nominal warm-running signal supplied to it is a 50% duty cycle so it's nominally half-open (i.e. open half the time). In your case, when the duty cycle is increased, it leaks more from the control pressure circuit = lowers the control pressure = allows the plunger to move more for the same intake airflow = open the slits more = adds richness. And, likewise, decreasing the duty cycle makes things more lean. On a US model, changing the frequency valve leaking changes the lower chamber pressure (rather than the control pressure) so the US system has a much faster response.

One thing you can do is just touch this added FV when the engine is running -- if it's vibrating/buzzing = it's still, at least, connected to the ECU and running (but could be open-loop or closed-loop). The next level would be to measure the voltage on the single wire of the O2 sensor while still connected to the ECU relative to ground during warm idle. If it's "swinging" every second or two from lean (<0.5 VDC) to rich (>0.5 VDC) = it's working as intended (closed-loop). Or if the O2 sensor is unplugged it will run open-loop (i.e., the FV will still buzz, but at a constant 50% duty cycle).

If it's not buzzing/vibrating = the system is dead. One point is that if it is now buzzing and you remove it = you'll need to retweak the mixture adjustment. And, likewise, if you take a non-working FV and do something to make it work = you'll need to retweak the mixture adjustment.

With regard to "NEED" -- that's up to you. Even though you have no inspection (and there are fewer and fewer places that do inspections), it is a legal thing. IMO, if the system is not working at all (FV not buzzing at warm idle) = that's some justification for stripping it all out and reverting to a stock euro K-Jet without Lambda configuration (but I'd keep all the parts), and would indicate the system's mixture was adjusted when the FV was dead. If it's working at least open-loop (i.e., the added FV is buzzing at warm idle) = I'd just leave it as is. If it's actually still working closed-loop = MIRACLE!

 

Steve has never ceased to amaze me with his CIS expertise !!! Wow !

 

Steve's reply deserves some sort of award, amazing knowledge! Hard to believe that rather convoluted installation was an "official" modification. Did the car actually run better as a result of this, or just lower emmissions (not clear to me how the modification as described would lower emissions)?

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Won't disagree that that is done in a way that is higher up on the "ugly" scale with those obvious white wires and mounting that resistor in such a noticeable place, but, in terms of what and how it's been done, it's about the same as the others I've seen. Can't say that I've ever seen one where I've thought to myself: "Wow, that is very nicely done, and looks totally stock".

Won't change how it runs, but, in theory, the engine would be operating more often more closely to stochiometric so should slightly reduce total emissions. However, I'd wager that is was more important to just be able to check "yes" on a bureaucrat's list of needed modifications that it has been changed to have some sort of "with Lambda" functionality like a US version.

PS Thanks for the award

 

I think its your furductor