Speed control problem with PS 2 Diesel

I have a set of MTH E6 Diesel engines (item number 20-2258-1) that were new in the box until last week when I opened the box and removed the diesels for the fist time.  It is a gorgeous set!  I replaced the battery with a new full charged one and the engine was found and added to the remote but it did not list type of engine.  I started it up and everything seemed to work OK so I ran the engine with the  trailing powered a attached and noticed the sounds went from one level to the next and then back down.   The speed was also fluctuating to correspond with the sounds.   It did this at all speeds.  I removed the second A and the engine did the same thing by itself.

Also noted that unlike any other PS2 engine I have ever run, the engine speed increases very quickly with just a little rotation.

This is a very early PS2 model (2001).  Has anyone experienced this problem and if so, how did you correct the problem.

Thanks for any help you can offer,

Don

Original Post

I don't know of any issue running the master by itself, but it sounds like you may have a tach sensor or board speed control issue.  I'd be looking at the tach sensor, the flywheel tape.

One thing to try, do a factory reset.  Since this is a "new" engine, and presumably it's never been messed outside the factory, the fact that you didn't get the engine info suggests it has a problem adding it.  I'd also consider trying it on a test track with nothing else connected or on the track.

I recently saw this phenomenon for the first time recently.  Speed fluctions at in neutral and erratic speed control.  It was a PS-2 5V also.  Change the tach reader.  G

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Yes,  Does this one have a space between sensor and PCB or is it flat on PCB.  The Part # is AG-0000058 for the non spacer version.  If it has a spacer I need to know thickness.  1.1mm or 2.2 mm.  G

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Don, you might think about pulling the board and have an MTH tech put it in his board test fixture.   By doing this, you are now using the tach reader from the test fixture.    I agree with George to change the tach reader.   

 

 

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DIFFERENT ISSUE!

Thank you John, George and Marty for the suggestions.  I was able to get a replacement sensor from George and installed it in the engine.  The engine accelerated more smoothly but the sounds would go from one rev level to the next and then back down again in 2 to 4 second intervals but it did not look like the engine was speeding up or slowing down.  I put another earlier model PS2 diesel - a UP H1044 switcher - on the track with it and ran the two at the same time.  When the remote stated the B&O E6 was running at 15 scale MPH, the H1044 was running at 30 scale MPH and all the while the E6 rev level was going up and down and up etc., but it did maintain a constant speed with relation to the H1044.

Any one have an idea as to what would cause this problem?

Thanks again for the help!

Don

Replace tach tape and make sure gap is small.  If that does not fix it, reload sound file.  After that something failing on the PS-2 5V board.  Won't be repairable in my mind.  The engine seems to be missing counts, so it speeds up.  Why the engine sounds ramping up and down so rapidly is a little weird.  G

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