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View Full Version : thermocouple not working when in manifold



kyle03d
June 8th, 2006, 07:29 AM
I have tried the few thermocouples that I have around and they all seem to work fine when hooked up to the flashscan box. BUT when they are put into the manifold or touched to a ground, the reading goes right to 32 degrees.

Thanks,
Kyle

McRat
June 8th, 2006, 09:01 AM
Got the polarity right?

GMPX
June 8th, 2006, 09:09 AM
That's what I was thinking, one side of the input to the thermocouple chip is connected to ground internally, it might be that one of the wires in the thermocouple is also connected to GND and if it is all the wrong way around it just shorts the input (don't worry it won't harm anything).

Cheers,
Ross

kyle03d
June 8th, 2006, 10:33 AM
I read on here that the red goes to pin A so I wired it that way, so when it didn't work with it in the manifold I tried them the other way, and then continued to try 2 more thermocouples both ways. Seems wierd. Thanks for the help guys.

GMPX
June 8th, 2006, 12:47 PM
So all of them give the same failed result?

Cheers,
Ross

kyle03d
July 26th, 2006, 06:41 AM
yep

GMPX
September 22nd, 2006, 12:29 PM
We sent a modified unit off to someone with the same problem, just waiting to hear back.

Cheers,
Ross

kyle03d
September 23rd, 2006, 05:12 AM
modified cable?

awesome

GMPX
September 23rd, 2006, 01:46 PM
Yes, a modified cable, it's only a 3 minute job to do, but we would like to see it actually solves the issue first :)

Cheers,
Ross

chevyspy
August 14th, 2007, 12:44 AM
What thermocouple/pyro gauge would be best to use with EFI Live. I would like the ability to run a gauge and feed EFI Live, is this possible? Vehicle is 2006 Duramax LLY. Thanks.