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2008 Honda cooling problem

J

jamsta

New member
BF9.9D. Engine runs at idle but after shifting into gear and running up RPMs a bit, engine stutters and then dies. Pee stream is cool to the touch at first, but when engine stutters, the water stream is blazing hot. Black soot-like flakes floating on water surface. Not good, but what is it?
 
Well, it could actually be two different things, not just overheating.
But...it IS overheating so you need to address that issue first and worry about the black stuff afterwards.

The pee stream should never get so hot that you can't hold your hand under it comfortably while the engine runs.

But don't hold your hand in the stream and shut the engine off. When the engine stops and the pump stops pushing water, the temperature spikes as the water in the block drains for a few seconds and that can scald your skin.

I think that your thermostat may be stuck completely closed. If it is, the engine will begin overheating fairly quickly.

If you've never replaced the thermostat, you should consider doing that.

However, I have also seen waterpumps that had damaged impeller vanes produce a decent pee stream but not pump enough water to keep the engine cool. Again, if you've never replaced the pump, you may want to do that too.

Good luck.
 
Thank you. Thermostat. Maybe that's it. Will replace it. If stuck closed, does that explain my symptoms? Pee is cold, then engine stutters and pees very hot before shutting off. Is the thermostat stuck closed and then opens when it gets crazy too hot perhaps?
 
A "sure fire" test is to just remove the stat, replace the housing then run it with no stat to see if it gets waaay better or does the same thing.

If it runs good with no stat, then get a new one. DO NOT continue to run it with no stat. That will cause you problems you don't want.

Good luck.
 
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