Within a month of picking up my Excursion, I had a set of Isspro gauges installed. It was winter and I was amazed at how long the transmission took to get up to temp while the factory idiot light gauge was there withing a few minutes. Fast forward summer and my Isspro has been working wonderfully, as I drive I watched it steadily increase until about its no more than 90 about ambient air temp outside even while towing 9500 pound travel trailer.

A few weeks ago, I did the transmission flush per directions on FTE. A short time later I started to notice my Isspro starting to jump all around on temps. Normally running much hotter than 190 also (once to 280 although there was no way the transmissiong had time to get that hot). The whole time the factory guage didn't stray from normal. I am worried that the I screwed something up in the transmission and the gauge is accurate or that there has been a failure in the Isspro.

Is there a way to run a check via computer to find out what the transmission temp actually is ? or do I need to throw another gauge at it?

Thanks

 

You can get a scan tool that can look at live data. Transmission Temperature is available in the data stream.

The factory gauge is calibrated to be right in the middle of normal any time the transmission is between 50°F and 230°F. That's why it gets into the normal range so much faster than your Isspro gauge.

The Isspro has either a bad connection, bad ground, or a bad sender.

 

Four letter word! That was fast. Thank You. I do love this site.

Hunter 9905

 

Mark, you rock.. that little tidbit saved me alot of headache... I suppose the water temp sender is similar since it never moves..

 

I have an Actron scan tool that I always have plugged in to watch the live data stream when we are towing just so I can watch the true coolant and trans temps. One of these days I'ii get a different one that is easier to watch while we are driving.

 

Well, I pulled apart the gauge and checked and redid every connection I could find. I did not see anything obvious. Changed the oil and filter too. When I took it for a drive, the gauge worked fine and normal. So... fingers crossed.

Hunter