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Old Nov 12, 2008 | 08:35 PM
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390 Engine Trouble
I have a 390 that has an issue at speeds above 65mph. The engine cuts out and sputters until you slow down. Im wondering if this is a fuel pump, or a carb issue.
 
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Old Nov 12, 2008 | 08:38 PM
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Originally Posted by 73BlackBeauty
I have a 390 that has an issue at speeds above 65mph. The engine cuts out and sputters until you slow down. Im wondering if this is a fuel pump, or a carb issue.
Did you check the pressure? when's the last time you changed the plugs?
 
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Old Nov 12, 2008 | 08:43 PM
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Yea its got 40 lbs of oil pressure and new autolite plugs and wires.
 
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Old Nov 12, 2008 | 08:52 PM
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I think he was asking about fuel pressure?
 
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Old Nov 12, 2008 | 08:57 PM
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it has good fuel pressure to
 
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Old Nov 12, 2008 | 09:00 PM
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Originally Posted by 73BlackBeauty
it has good fuel pressure to
You running an electric or mechanical fuel pump?
 
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Old Nov 12, 2008 | 09:02 PM
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mechanical
 
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Old Nov 12, 2008 | 10:20 PM
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Had a nearly identical problem a few weeks back with my 390. I'd check any rubber portions of fuel line for cracks/leaks that may allow air into the line. Also, replace your fuel filter.

I did both and the problem disappeared. You didn't mention it with yours, but mine ran fine at lower speeds and idled with no problem. It was just choking at anything above 3000 RPM.

Rick
 
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Old Nov 12, 2008 | 10:27 PM
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Your carb could also be clogged up with carbon deposits...did you inspect it?
 
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Old Nov 13, 2008 | 01:11 AM
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do you have electronic ignition or points? If points check your point gap. Electronics could be bad at higher rpms as well. Possibly a bad coil or rotor button and cracked distributor cap. Just things to consider.
 
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Old Nov 13, 2008 | 07:13 AM
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Originally Posted by TexasRho83
Your carb could also be clogged up with carbon deposits...did you inspect it?
I was told not to run this engine over 3,000RPM's for too long. I'm running a 4-speed, 4:10 gears in my 250.
 
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