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Old 06-09-2003, 09:50 AM   #1
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Default Engine problems

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Last edited by nanjoutai; 11-09-2011 at 02:41 PM.
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Old 06-09-2003, 10:01 AM   #2
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Default Re: Engine problems

Quote:
Originally posted by nanjoutai
I'm running an MR12 in an NTC3, and am having some trouble keeping the engine running for long periods.

Starting cold, it has a perfect idle and revs without problem. The large amount of smoke/fuel coming from the pipe would indicate I'm running quite rich (at speed... little/no smoke at idle). If I lean it out, it idles poorly and revs uncontrollably. If I richen it at all, it dies when given throttle.

After about 5 minutes, when the engine is up to temp (don't know how high.... planning on picking up a temp gun and recording temps this weekend), it stalls when given throttle, and then refuses to start (or if it does, refuses to idle for very long or rev at all). Wait 2-3 minutes, problem goes away.

Also worth noting, it bogs at WOT, but runs fine up to 80% throttle or so.

Seems like the engine is overheating, and cooling down solves it. Or, as I'm running quite rich, it could be that my needle settings aren't accurate when running at full temp. Or maybe the glow plug isn't within spec and doesn't operate at full temp in my environment?

I also get air bubbles in the fuel line, although everything appears to be air tight. I do notice that the fuel in the tank experiences insane turbulence, resulting in air every now and again making it's way down to the fuel inlet in the tank as the fuel is sloshed around from the pressure coming from the pressure line (if that is in fact too much pressure, I'm guessing a longer line would help?).

Anyway, I have lots of problems and little experience. Any ideas? I can only think that I'm running way too rich and adjusting it fails because I'm absolutely horrible at doing so. I've no clue why it dies at full temp, and I'm not sure if a tsunami in your fuel tank is normal......

So perhaps I'll get a temp gun, play with the pressure lines, and pray to God to bless me with some tuning skills.

Also, anyone know the factory/recommended needle settings for an MR12? The instructions it came with are quite vague.....

Thanks,
Nanjou Tai
What was the temp?
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Old 06-09-2003, 10:05 AM   #3
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Default

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Last edited by nanjoutai; 11-09-2011 at 02:41 PM.
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Old 06-09-2003, 10:08 AM   #4
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Quote:
Originally posted by nanjoutai
That's probably the million dollar question, but as I mentioned in my post, I don't know. Plan on picking up a gun and finding out this weekend though.
Temp gun is a well worth money spending device. You see, you paid hundreds of dollars on an engine, at least you wanna give it a good care. Use the temp gun, make sure it's not overheating, then troubleshoot more from there.

Last edited by eddiethefish; 06-09-2003 at 10:29 AM.
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Old 06-09-2003, 10:20 AM   #5
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Sounds like you're running lean. Just a thought...when your engine is cold and it start up and is running fine, it's lean. Why? Because you engine is tuned correctly for when it is cold. Obviously it's gonna get hot and when it does, then you won't have enough fuel to keep it running. I'm running the same engine in my NTC3. When it starts up cold, it sounds like it's gonna bog and die. But when it warms up, it runs fine. Also, I'm one of the unfortunate ones that have had the alleged "non-existant" tank problems. I finally got my car stable after getting a "good" tank.
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