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post #1 of 5 Old 10-29-2009, 08:34 PM Thread Starter
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pyro problem

im having issues with my egt probe. i have the white faced ev series gauges. started out as the gauge would not register at first and happeded once or twoce over that last week. now it is getting to be all the time. ive checked the wiring and from the plug end to the probe is where im getting the short at.

Randy
2006 f250 4x4
crewcab shortbed
lariat auto
Some tuning, gauges and other assorted non factory dodads
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post #2 of 5 Old 10-30-2009, 09:45 AM
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How are you measuring it? The probe generates a small voltage in proportion to the difference in temperature between its "hot end" (the probe tip) and the end of the leadwire. If you have a multi-meter with a millivolt setting, check the voltage at the probe wires, it should be approximately 5.2 mV (negative to red, positive to yellow).

Regards,
Michael Pliska

ISSPRO Engineering Manager

1995 F350 PSD CC DRW, 271k miles
10 ISSPRO Performax™ gauges, Tymar Intake, Gutted EBPV, Tymar 3x4" DP, Tymar 5" exhaust, Cat's lost, Baby Swamps, Swamps tuning, Tricumulator springs and Accumulator Valve, Tru-Cool 4590
1998 S&S 9.5' slide-in camper
33' enclosed tag trailer with 2 drag cars (73 Vega Super-Gas & 74 Vega ET)
92 GMC Typhoon, 73 Chevy Blazer with Pontiac 400, 73 T/A 455
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post #3 of 5 Old 10-30-2009, 09:52 AM Thread Starter
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The issue I don't think is voltage. The gauge will read 0* at idle and when first installed would usually go to about 300*. Even during acceleration it will read 0* when I should see anywhere from 600-900*. If I crawl under the truck and wiggle the wire comming from the probe it will jump to temp. And work till for a while... If I hit a bump or go down a dirt road it will act sporadic and either go to 0 or fluxuate 200-400*. This is what leads me to think the probe has a short in it.

Randy
2006 f250 4x4
crewcab shortbed
lariat auto
Some tuning, gauges and other assorted non factory dodads
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post #4 of 5 Old 11-02-2009, 05:10 PM Thread Starter
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any ideas on what i need to do to further trouble shoot this or how to fix it? i bought the gauges in march i believe

Randy
2006 f250 4x4
crewcab shortbed
lariat auto
Some tuning, gauges and other assorted non factory dodads
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post #5 of 5 Old 11-04-2009, 08:09 AM
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It sounds like either a short or an open in the thermocouple circuit (both will yield the same results in this case). Open circuits are far more common than shorts for these items. The most common cause is corrosion on the wiring at the ring terminal connection down by the exhaust, which should be covered by 2 layers of shrink tubing right now. I would cut away the shrink tubing, disassemble the screws/nuts holding the ring terminals together, clean the ring terminals with steel wool, reassemble the screws/nuts (with replacement shrink tubing already in place to be slid back over the connections), add a dab of dielectric grease over the terminals, and shrink some tubing over the separate connections then one more layer over both connections.

If that does not solve it, then it may be a wire failure inside the thermocouple, or a bad solder joint in the amplifier box. Either way we will take care of you. Please let me know what you find.

Regards,
Michael Pliska

ISSPRO Engineering Manager

1995 F350 PSD CC DRW, 271k miles
10 ISSPRO Performax™ gauges, Tymar Intake, Gutted EBPV, Tymar 3x4" DP, Tymar 5" exhaust, Cat's lost, Baby Swamps, Swamps tuning, Tricumulator springs and Accumulator Valve, Tru-Cool 4590
1998 S&S 9.5' slide-in camper
33' enclosed tag trailer with 2 drag cars (73 Vega Super-Gas & 74 Vega ET)
92 GMC Typhoon, 73 Chevy Blazer with Pontiac 400, 73 T/A 455
GOA, IDPA & NRA member and certified firearms instructor
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