Mini maxx EGT reading - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 05-25-2013, 09:07 PM Thread Starter
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Mini maxx EGT reading

My egt reading is wacko. I had to have some work done by the dealer and had my tech guy replace the egt sensor on the passenger side behind the fender well. That didn't fix anything. The reading jumps all over the place. From
250-300 at idle, when driving and cruising it shoots from 350-900-650-780- ECT. Just all over the place with no type of normal range from light throttle into heavy throttle.

Can I drill and tap into the egr cooler block off plate on the driver side up pipe? After looking at the mini maxx I don't see where an egt pyro would plug in?

Idk what to do but it sucks not being able to rest egt's!


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post #2 of 8 Old 05-27-2013, 08:59 AM
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It doesn't plug into the mini maxx. It plugs into the block on the OBDII cord where the hdmi plugs in from mini maxx I believe

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post #3 of 8 Old 05-27-2013, 08:16 PM
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If you want to add a non oem pyrometer, you will need this kit from H&S with the PCH board. The EGR block off plate would not be a good location as it is a dead end. you need to mount the pyro in the exhaust gas stream.
Universal Pyrometer Kit for Black Maxx/Mini Maxx (Includes Thermocouple and PCH) - Replacement Parts - Accessories / Replacement Parts
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post #4 of 8 Old 05-27-2013, 08:39 PM Thread Starter
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Thanks for the input y'all. I'll probably buy the h&s kit, although I'd rather utilize the factory pyro but not sure how to fix that? Doesn't it get it's reading from the egt probe on the passenger side up pipe area?


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post #5 of 8 Old 05-28-2013, 09:22 AM
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Yes the factory pyro the H&S tuner is reading from the ECM is the one in the RH up pipe known as EGRT#1. Your symptoms sound like a bad wiring conection. I would double check to make sure they did actually change the pyro probe in that pipe. Then look closely at the plug & wiring the probe is conected to. Make sure the wiring hasn't rubbed through or burned & isn't grounding. The intermittent jumpy readings sound like a bad conection in the plug.
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post #6 of 8 Old 05-28-2013, 03:34 PM Thread Starter
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Quote:
Originally Posted by TD-5 View Post
Yes the factory pyro the H&S tuner is reading from the ECM is the one in the RH up pipe known as EGRT#1. Your symptoms sound like a bad wiring conection. I would double check to make sure they did actually change the pyro probe in that pipe. Then look closely at the plug & wiring the probe is conected to. Make sure the wiring hasn't rubbed through or burned & isn't grounding. The intermittent jumpy readings sound like a bad conection in the plug.
Thanks man, I'll investigate more closely and see what I can find. I'll take a video of my mini maxx too and post it up to make sure I'm not wrong- could be normal behavior but I don't think it is


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post #7 of 8 Old 05-29-2013, 01:13 PM
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Sounds like a wiring/connector issue. I would check that out to see what's going on. Could be as simple as a little bit of corrosion at the connector.
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post #8 of 8 Old 05-29-2013, 01:30 PM
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unplug the pryo probe from the truck and see if the reading changes. i believe if the mini maxx is not getting a signal from the truck it reads 92.

also go thru the menu on the mini maxx and make sure it is set on pyro 1. if it is set on H&S pyros or pyro 2 it wont read properly
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