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Jmackaecker

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    this is all new to me. working on garbage tricks

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  1. This is the reading on the bigger sensor wire. Key is on and signal wire is disconnected from the back of the gauge. This reading does not change when the signal wire is connected.
  2. Ok so I have this 06 Mack 688 and the temp gauge is inop, (pegged out at 260°). I've tested the wires behind the gauge. Readings: White wire/ I= battery voltage 12v White wire/ S= signal from sensor Black wire = Ground So I disconnected the S wire and tested. Reads a solid ground with the temp sensors unplugged or plugged in, at the water manifold. The gauge it self works, needle goes back to cold when I disconnect the S wire. Then I tap the S wire to the S post on the gauge and it jumps right back to pegged out. So I'm thinking the S wire is shorted. So I go to the sensors and test the bigger one unplugged, One wire is 12v and the other is neither ground nor power but shows voltage on me power prob so I know it's not broken. I'm just wondering what sensor is the one that operates the gauge itself. I read somewhere on here the one that pionts to the back of the truck is the ecu gauge and the one that pionts to the driverside is the gauge. Also would like like some more input on why it might be working. Thanks in advance!
  3. ok ill try that this afternoon. what am I looking for when I crack open the line?
  4. ok so I have the fuel return check valve out and it seems to be moving freely.
  5. yes it does, when holding rpms at about 12-1250
  6. ok so I moved the gauge to correct port on the block. The needle is all over the place. It seems to run way better with gauge hooked up, and doesn't really have the problem any more. There is still smoke but more now when I let off the peddle after romping on it. I'm uploading a video to you tube. I'll send the link when it's done. thanks BTW for taking your time to help. also is this the check valve to check/replace?
  7. installed the hose with the valve and the psi slims down to about 70psi.
  8. Finally got around to installing the fuel psi gauge. Note that the psi is fluctuating between 55 and 85-90 because there is no in line valve to hold the value. would I still go off of the highest reading? The filters are new and the pump seems to be Farley new.
  9. just seen that the turbo to manifold is leaking exhaust
  10. yes sorry its white smoke and an E7 350 engine
  11. Alright Ill Have and update tomorrow. thanks a lot for leading me in the right direction.
  12. I got this here Mack at a job I just started. I'm semi new to diesel engines and to the JalTest software. To start this truck after its been sitting for a week or so I would need to use starting fluid to get it running, after that it runs and starts no problem till it starts. After I get it running to OP temp go to rev it up, 700 rpm all the way to about 1100 is ok, but when I go to past that it will start blowing smoke if I put the petal to the metal. I've also performed a cylinder test on a known running fine 690s truck in the image below. I'm not sure if those numbers are even up to. The test on the one smoking, the numbers ranged from 29 to 35, also tried a compression test using JalTest. I would be Cranking the engine over and the date would never show up on the screen. So I perform a compression test on the know good 690s and with in 5 sec of cranking I had info right away. Any Ideas?? Thanks in advance!
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