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So a PS2 Challenger I bought a while back on the forum was doing ok but has a few issues that I'm about to attempt to troubleshoot and fix.  I figured I'd run this past you guys first to see if anyone has any insite on this before I open her up tonight.

 

Ever since I got it, when I have the smoke on and blow the horn at low speeds the marker lights flicker and it slows down a bit while blowing the horn.  If the smoke is off everything is fine.  I'm hoping its just a bare wire touching something and an easy fix.

 

But last night while running it, it was doing ok as I left it running for about 5 minutes.... then all of the sudden it accelerates to top speed (maybe) and I quickly hit the DIR button to stop it which it does.  So I figure that was an anomaly and throttle it up to 25/30 again.  After a few minutes it suddenly accelerates to a super fast speed and then trips the MTH Brick's breaker.  I wait a minute and push the breaker and it trips immediately.  I try this twice more and then take the engine off the track and try the breaker and it doesn't trip again.

 

So, first I'm hoping the engine isn't toast.  I put it back on the shelf the rest of the evening and ran my old weathered Y6b.  

 

It seems I heard of this problem before a while back but I couldn't find the thread.  Anyone have any advice?   

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The lights flickering are probably a faulty MUX board..... What's a MUX board?? I think it's way of sending additional  data from the main circuit board via 1 pin  to a board in the engine when all the pins on the tether are used up.  This problem has been around for quite some time. (something like that)

 

How's the battery???  A engine will with a dead or weak battery will drop into neutral (conventional) with the  slightest short  and the next slight power  interruption will cause the engine to take off. And as  Gunrunner has mentioned, check out the tack reader and timing tape spacing.

I did the "Feature Reset" and ran my track cleaner around twice.  Then I proceeded to run the engine for a while and it seems to be ok now.  I did not open the engine up to look into the smoke on/horn blowing problem yet.  I'll try and get to that this week and see what I can come up with.  

 

As the engine ran fine last night I thought about something.  I asked myself if the engine TOOK OFF when the "clickity clack" feature started?  Because it ran for a bit fine at speed, then took off.  Could it be related to the "clickity clack" kicking in?  Hmmmmmm..... 

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