[MLB]

Thanks

Tonite i will check for 12V at the injector plug to see if i can identify which wire (or both) is the culprit.

And look for some of that tape.

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[MLB]

As far as tracking down a failure in the wiring for cylinder three feel injector, I plan to move forward expecting the bad spot will first show an insulation failure (like I saw on cylinder two plug where the wires had not yet broken) rather than the more difficult to observe possibility of broken wires inside intact insulation.

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[az968]

It's muck more likely a wiring issue resulted from the movement of connectors while working on the engine than somewhere deep in the wiring recesses. Your plan of attack is most appropriate. Try switching injector 2 and 3 and see what happens.

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[MLB]

Fuel injector plugs for cylinders 1, 2 and 4 all read 12 V for the hot wire, but cylinder number three hot reads only 5 V. So there's voltage there strangely enough but not enough to cycle the injector apparently. (And that still could be because the other line that can be switched to ground at the ECM may be broken)

I have now exposed about 10 inches of cylinder number three wires and there are no breaks...


So...can anyone check their voltage at cyl 3 plug (with the key turned to run position) to verify it should be 12V?

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[banditsc]

Did you check the chip install in the ECU? Make sure you have all the pins installed, it's easy for one to get bent or broken on install.

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[MLB]

Thanks i will verify the chip install tonite

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[banditsc]

Also check for any damage to the connector on the ECU board, very possible for a solder joint to crack.

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[az968]

Yeah, the supercharge has a new chip so it could be a problem with pin 35 as banditsc suggests.

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[MCL968]

Excellent suggestions! Esp the solder joints.

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[MLB]

Well crap, is this supposed to be plugged in somewhere!?

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[MLB]

All pins on the chip appear to be fully and correctly seated, and the depression in the board receptacle and on the chip are aligned on the same end


   

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[flash]

lol - um - i think you just found your problem

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[MLB]

Excuse me?

First of all I didn't find a picture or clear description in your instruction manual. And this is the way Pete's chip was designed with the depressions aligned on the same end. I guess yours is supposed to go the other way around?

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[flash]

no no - the pic above showing the multipin connector of the ECU disconnected

 

the chip is correct

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[MLB]

Funny. Obviously the multipin was just disconnected in order to verify chip placement.

The small white 2 prong plug in my fingers is the one i found disconnected.

And i dont find its connector mate anywhere nearby

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[flash]

lol - wasn't so obvious to me.

 

that connector is the coding plug for ROW cars that run on leaded fuel.  it is not used on our cars.

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[Bulti]

IIRC, on my car that plug is wrapped or capped off by the factory.

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[MLB]

Ok, so I'm back to only 5V reading at fuel injector #3.

Guess ive still got to find a damaged wire. Fudge!

Appreciate the feedback, just discouraged at being "so close and yet so far"

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[Bulti]

You could watch this video on voltage drop:


https://youtu.be/DfLyh43iihM


The guy has a way of explaining stuff in a way few others can. His video's helped me out on a few occasions.


Give it a chance, it may help.

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[MLB]

OK I got it figured out. And no broken wires. That was a good YouTube video Bulti, just didn't happen to have anything to do with this issue.


So the most important clue was the 5 V I detected at cylinder number three, but I didn't put all the pieces together until my local mechanic said tonight at the club meeting that's a reference voltage Porsche uses for various sensors. I made a mistake, and I'm a better person for it now ;0)

And after I repair the stupid wiring loom that I cut open I'm going to go have some fun driving (below 4krpm)

Thanks again for all the support; next i will finally get to rave about the awesome supercharger!

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