Yale GLC030, engine 2.0 mazda, starts and idles great, accelerate to high RPM, runs smooth for about 25 seconds then starts to brake up , slows down almost to a stall then after about 5 seconds picks back up to high RPM and does this over and over like clock work. Any suggestions.
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I'll have to give this one some thought. Just so I'm clear:
Complete tune up has been done
Fuel system has been replaced
Removing exhaust has no effect
No pressure build up in hyd system
When engine slows down- no missing present- slows down like throttle being closed
At lower RPM it seem to take a little longer but, does the same. On the exaust system, I removed the pipe at the manifold and it did the same. Their is no load on the hydraulic. I messed with it a little today and I noticed that even at an idle now the engine will miss a little and idle smooth again over and over just about 5 seconds apart and the cycle is getting shorter at high speed, its now about 15 to 17 seconds. What ever it is its getting worse.
Does it do this rhythmic cycle only at full throttle (up against the governor)? You mention 25 seconds at full throttle- if it does do this cycle at lower rpms, is the amount of time for it to start this cycle the same? Looking outside the box: could be hyd system, trans or even the muffler (I've seen them collapse internally & cause backpressure)- just some thoughts
Tried two different distributors that worked fine in the other trucks. I have watched the timing mark as it brakes up. At full speed it advances to about 8 degrees and as it brakes up it slowly drops back to about 2 degrees, never stops firing or skips a flash. I have talked to our local engine rebuild and he said he can't think of anything internally that would cause this.
I've never seen this on a Yale- only on Toyotas, but you never know- try adjusting the ignition timing when the engine starts to break up- could be a ignitor going bad.
On Toyotas I've found that when the ignition electronics start to go bad it affects the ignition timing. Usually it's during the starting cycle that the issue comes to light- unit won't start- extremely advancing the timing while cranking will get the engine to start- then retarding the timing to normal specs after starting keeps the engine running good.
Just a thought- the chatter could be from the ignition timing changing on it's own- try checking timing with a timing light while the issue is happening- keep me posted
Governor was replaced. no change. Governor was removed and ran engine without it, no change. carburetor was replaced. no change. lp fuel lock off replaced. no change. lp regulator replaced. no change. Their is a lot of chatter from the valve train when the engine starts to brake up.
Sounds like the pneumatic engine governor under the mixer (carb) is going bad. If you dead head the tilt cyl's, putting the engine under load & accelerate the engine- do the symptoms change? If the engine rpm raises & then plateaus & stays there, replace the governor
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