aggravation

I hooked up the SharkTuner with hopes to try and tune my idle now that I have a rebuilt LH ECU and have tightened up a few potential air leaks but now I get "Lost Connection with LH ECU" box popping up when I try to load a map...then trying again it seems to load both the LH and then the EZK but after starting the engine and going to the fuel map page there is no blue crosshair dancing among the cells and no, there is no warning that the ECU is not using this map.
It's on the base fueling with cat map.

Switching over to the ignition map page I see the blue crosshair appears randomly for a split second and disapears then reappears in other random cells meanwhile the knock counter is registering 750 knock events and quickly multiplying in increments of 750....the engine just idling so it's not likely these numbers are even mathematically possible!

What the hell have I done now?!?
The LH ECU is a fresh rebuild and the car is running fine other than my idle is still averaging 950.

Any of you SharkTuner users ever have this problem. I tried reconnecting it checking that all the connections are tight...no joy.

Jim Morton

Craig:

I have not seen this issue specifically, but when I have seen the "lost connection", it has usually been something to do with the serial port and its connection with ST.

I'd check the serial port baud rate, possibly related to the serial cable / serial adapter you are usin, if USB.

If not serial related, just a check point here, but check your wiring on the diagnostic connector. Maybe one of the barrel connectors is intermittent, or...

As you mentioned switching between fuel and ignition maps, I will assume PEMs. If so, do you have the resistors on the diagnostic port ST cable ? There is reference to needing these resistors in the PEM manual.

Also, if your car is late enough to have the "digidash", there is another wiring mod to disconnect the "digidash" signal while ST is connected. This is also described in the PEM manual.

Good luck with this !

Please post what you find.

Regards

John Speake

Agree with Jim.

So you loaded files into the PEMs and the car runs, but the real time data is incorrect ?

Try selecting just LH or EZK "has PEM fitted" in the Tools> Options menu. Then upload the selected PEM file to the ST, then check real time data. Try both LH and EZK on their own in turn.

aggravation

Thanks guys!
To be clear, the PEM's already had the proper files loaded, I went to use the SharkTuner so I wanted to load the same files again just as a precaution to be sure I had unchanged version of them before starting to tune the idle cells.
It was when I tried to load the LH file that it wouldn't connect.
The real time data was limited to EZK, my inability to see the blue cross hairs at that time on the EZK side was probably because I was looking at the cruise map not the idle. The blue cross hair was also not available on the LH side at that time in any map I tried but I don't recall if I looked on the idle map there either...

John, in trying your test
"....selecting just LH or EZK "has PEM fitted" in the Tools> Options menu. Then upload the selected PEM file to the ST, then check real time data."
first the LH and then the EZK, what I discover is the LH refuses to let me load a file, it has no communication with the ST, the EZK allows the file to be loaded and real time data is monitored correctly, the blue cross hair is in the idle map right now as the engine was cold. (Voltage is 14 volts during this test)

So it looks like my LH doesn't want to play nice with the SharkTuner.
I bought it from Roger, I believe it is one of the rebuilds that you supply him. Is there any other test I can perform to verify this condition?

In case it matters, when I received the LH I took the PEM that came out of my old LH, file already installed, and installed it into the new LH and drove the car. As far as I can tell the new LH is working fine with the exception of when I try to use the SharkTuner.

Thanks guys

John Speake

That is strange....... your car is a fairly early S4, isn't it, an '87 ? The rebuilt LH is copmpatable with the PEMs, so I don't understand what the issue is.... check 35 way LH connector is OK.

Is the resisitor fitted to the diagnstic lead ?

aggravation

Mine is a 1988. I checked the solder on the resistor this morning, gave it a tug with my finger tips...it's tight.
I'll disconnect the battery a little later today and go over the 35 pin connectors and a few other electrical points. Something is probably broken free...

John Speake

When you try and upload the LH file, does the ST recognise that the igntion has been switched on ?
(assuming you try from igntion off.)

Have you tried uploading the LH bin file to the laptop when engine is running ?

aggravation

Yes, it starts to load after turning the key but then the warning box pops up. I'd say about half the file loads based on catching a glimpse of the progress bar after clicking the button to close out the warning box.
I haven't tried to do it while the engine is running with this LH ECU but I have done that in the past, it takes too long so I stopped it, shut off the engine and then loaded it. Should I try it now?