Flaky Pyro Reading

[JFitzgerald]

Just installed my gauges last weekend - Isspro R3607T and boost gauge also. They've been working fine until last night when I noticed the pyro needle jerking around rapidly. When I reach under the dash and tap the little control box that came with it, it goes back steady. Today, when I left work for lunch, the needle didn't come up at all when I started the truck. I sat there a minute waiting, having a hard time believing the gauge hadn't moved yet since it is about 90* today. Then I tapped the box and it started reading right again.



I'm guessing I have a bad "control" box, but is there something I may have done wrong? Connections are good and tight, I installed carefully per instructions in the box.



What's in the box anyway, a signal amplifier?



Just want to make sure I didn't make some mistake before I call the place I bought them. Is the box sensitive to mounting position?



Thanks, John

 

[DieselB59]

Sounds like you have a bad signal amplifier box. I have installed about four dozen of the EV pyros now, and have had two bad signal amplifier boxes out of all of them. Same thing..... works really intermittently, then nothing. On a side note..... my cb kills the pyro all together when I key up the mike. Comes right back when I release the button.

 

[TomGolden]

I have the older ISSPRO gauges (no amplifier box) and recently my needle started doing the same type of erratic activity. I called Isspro and asked for a suggestion, and the guy I talked to suggested checking the wire connections. When I went under the hood to trace the lines out, I discovered that my thermocouple had worked itself to finger looseness. I tightened it back down, and all is well again.



Tom

 

[JFitzgerald]

Thanks for the info, guys. It is erratic. Hauled a car to OH yesterday, all the way there and back - the gauge read fine. When I stopped to refuel just before I got home, the gauge was reading nothing. Tapped it again and it came back. I'll call the dealer I bought the gauge from to see about a replacement.



And, I'll check that the thermocouple is tight. I could see it working loose once or twice after installation with heat cycling and vibration.

 

[JFitzgerald]

Update

Just to let those who replied know what happened, I called Huckstorf Diesel, the dealer I bought the gauges from. They said they hadn't heard of the problem, but would call Isspro. A couple days later, I had a new pyro delivered to me. Just got around to switching it out last night (been busy ), and it's fine now.



Gotta say Mark at Huckstorf took good care of me. I purchased the gauges from him while at Muncie. He was the most helpful and had the best price on the whole package after shopping the vendors there.



Oh, and I checked the thermocouple, it was still tight.



Not affiliated with Huckstorf, just a happy customer.

 

[JohnE]

I've got ISSPRO gagues, too. The prometer reads well, but the signal amplifier box has a high frequency whistle. Sometimes the whistle goes away after a few minutes sometimes it stays on.

Anyone else noticed this?



Tom;

Good point on the thermocouple. The local diesel shop says the most frequentproblem is the brass fittings tend to lossen. They have better luck with stainless steel.



diesel on

-John

 

[Dkevdog]

John- I've become somewhat of a guage freak (I have 9 guages in all ) and I have two ISSPRO EV guages- 1 pre and 1 post. And yes, BOTH of them whistle. It's only annoying until a fire it up and then you can't hear anything anyway!



I also have had the intermittant guage crash, happened a few times right after install, and then nothing for about a month. Then yesterday, died again, five minutes later all is well.





Kev

 

[mikel]

Originally posted by JohnE

I've got ISSPRO gagues, too. The prometer reads well, but the signal amplifier box has a high frequency whistle. Sometimes the whistle goes away after a few minutes sometimes it stays on.

Anyone else noticed this?



-John

Mine does this too. I thought it was the gauge, never even thought to blame the box. It's pretty annoying at first, but so far after about 5 - 10 minutes it either goes away or I tune it out. Any ideas how to get rid of it?



Whistleing down the road,

Mike

 

[JBlock]

Mine had the same erratic neahavior

Interesting, right after I installed mine, the guage start droping to zero the firast night sometimes until until the truck was stopped and cooled down. after about a day or two the problem when away and never came back.



I running a comp with HY35 on level 1x2. I see high exhaust temperature if I put my foot in it. It was running in the yellow on MT Hood at a12-1400 rpm. I installed my set in Februaryy. Is anyone else have high temperature with the Christmas - February boxes. There an adjustment procedure but I have use it yet. Cool down never get below 300 mostly about 325.



I added the tunbuckle and raise the post to 25 psi. the high temperature are under load at about 10 psi boost. Managable by dropping out of overdrive in the mountains.



Comments.

 

[JFitzgerald]

Mine whistles too, same as Kev said, once the mighty Cummins is running, it is not noticeable. It is the control box, not the gauge and both my first and second one whistle(d).