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Old 07-24-2006, 09:51 PM   #1
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Engine won't Rev Up and Glow Plug Trouble

I've got a .15 CXP nitro engine (single needle carb). Broken in properly with 5 tanks of 20% Odonnel fuel. Still running same type of fuel.

To date, I've run about 12 tanks of fuel with no issue, until..... this happened today.

Car will idle fine, however, now when I accelerate, the engine will rev only slightly (about 1/4 throttle), then RPM's drop back to neer idle speed, even though the carb is wide open. I can run this way for the entire tank of gas. Accelerating with a short quick burst, then coasting at idle speed.

When I go to restart it, the glow plug is dead. Burnt out the stock one and a replacement.

Anyone have some suggestions? This is my first Nitro car and I'm not sure what the issue is.

Thanks
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Old 07-24-2006, 10:20 PM   #2
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Top end to lean. open it up one turn at at time.
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Old 07-24-2006, 10:28 PM   #3
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Quote:
Originally Posted by drfritz
Top end to lean. open it up one turn at at time.

Did just that. Opened it up in 1/4 turn increments, until I was 2 1/2 turns more towards rich and did not seem to help.

Any other thoughts?
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Old 07-24-2006, 11:14 PM   #4
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Quote:
Originally Posted by tarheel23
Did just that. Opened it up in 1/4 turn increments, until I was 2 1/2 turns more towards rich and did not seem to help.

Any other thoughts?
You might have something stuck in the needle, pull it all the way out and try to flush the seat by running the motor on the starter box. you might also have on big old air leak,make sure the head is tight, back plate and check the carb has not come loose on you.
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Old 07-25-2006, 06:43 AM   #5
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Thanks, I will check those areas today and let you know how it goes.

Appreciate it.
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Old 07-25-2006, 08:26 PM   #6
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Update.

Tightened heatsink. (seemed I could turn each bolt about a 1/4 to half turn)

Tightened Carb.

Checked backplate (OK)

Pulled needle out, cleaned and reattached.

Cleaned out area around glow plug. It is possible that this was my source of the air leak. Lots of grime and gritty junk in this area. Cleaned it out, and inserted a new glow plug. I'm thinking that my glow plug was not getting a clean seal due to all the gunk and grit around the opening.

Anyway, after all of that, fired it up and ran like a champ. Ran a full tank of gas through it and ran great.

Appreciate all of your help!
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