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Old 12-16-2007, 11:27 AM   #1
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Default Engine crackleing

When i start my engine it will idle and with out hitting the gas at all it starts to crackle but still stays idle and sounds like its about to die but it wont.....

is that because the piston is going barley fast enough to keep it moving on its own?
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Old 12-16-2007, 12:41 PM   #2
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maybe you have some dirt or something in your motor
clean out your motor and see what happens

good luck
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Old 12-16-2007, 01:02 PM   #3
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Old 12-16-2007, 01:27 PM   #4
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Last edited by houston; 12-16-2007 at 08:38 PM.
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Old 12-16-2007, 01:27 PM   #5
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Rear bearing could be shot...
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Old 12-16-2007, 01:30 PM   #6
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Quote:
Originally Posted by houston View Post
thats called four stroking , when the engine fires sporratically . sign of a good engine !! must still be breaking the engine in ? find a good tuner at your local track to help you tune your engine in you will be very appreciative
later,
monty
agreed, sounds like a new engine with a tuning issue..
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Old 12-16-2007, 01:41 PM   #7
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it has 2 gallons threw it and i know how to tune.

so what do you think is the problem then?
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Old 12-16-2007, 01:59 PM   #8
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Old 12-16-2007, 02:22 PM   #9
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Sounds like an airleak or a bearing about to fail. I would do like Houston says and break the motor down.
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Old 12-16-2007, 06:52 PM   #10
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OH SH*@ i remember now when i cleaned my engine last the insulator on the carb was cracked! is that the problem?

your so hilarious houston NOT lol


heres the pic(s) i used

look at the whole album for more pics

http://www2.snapfish.com/slideshow/A...2/t_=114970912
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Old 12-16-2007, 08:06 PM   #11
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i did an up and down the street like 5 mins ago and now its being restricted from 2nd gear and crackleing while going as fast as i can (in first) and not shifting into 2nd for some reason

im going to see if i can get a video
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Old 12-16-2007, 08:36 PM   #12
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try a hotter glow plug. What are your temps at?
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Old 12-16-2007, 08:59 PM   #13
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im useing a p3 turbo plug and i didnt check my temps i will do that tomorrow after school
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Old 12-17-2007, 03:09 AM   #14
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A crackling noise coming from the exhaust pipe usually means detonation. If you recently did any maintenance or repair to the engine and forgot to reinstall one or all of the head shims, there's a good chance that there's too much compression and it's creating detonation. Check the top of the piston and the inner surface of the head button - if it has the appearance of being sandblasted, then you're engine is definitely suffering from detonation.
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Old 12-17-2007, 08:07 AM   #15
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Quote:
Originally Posted by rcg33k View Post
A crackling noise coming from the exhaust pipe usually means detonation. If you recently did any maintenance or repair to the engine and forgot to reinstall one or all of the head shims, there's a good chance that there's too much compression and it's creating detonation. Check the top of the piston and the inner surface of the head button - if it has the appearance of being sandblasted, then you're engine is definitely suffering from detonation.
+1

That was my first thought as well. Also, going to a hotter plug will only amplify the problem.

Detonation is also usually described as having a "frying egg" sound.
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