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Guest Message by DevFuse
 

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83 brat lousy gas mileage


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8 replies to this topic

#1 rustybolts

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Posted 14 July 2006 - 01:12 PM

My brat has become a gas sucker(14mpg) choke is staying open timing ok smell lots of unburned hydrocarbons in exhaust egr blocked any ideas

#2 NorthWet

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Posted 14 July 2006 - 02:04 PM

Possibly due to misfiring? Have you checked ignition components? I would pull the spark plugs and see if waht they look like, especially differences between cylinders.

#3 rustybolts

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Posted 15 July 2006 - 10:47 PM

Possibly due to misfiring? Have you checked ignition components? I would pull the spark plugs and see if waht they look like, especially differences between cylinders.

Plugs all uniformly black idles fairly smooth plugs and wires new somehow seems carb dumping to much gas

#4 fbh

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Posted 16 July 2006 - 12:59 AM

could be a bad jet or a bad needle and seat valve. Take the top of the carb off (SLOWLY... these damn things fly apart sometimes, then you're screwed :banana:) and have a look close to the float, there should be a little valve (screw-in?) between the chamber and where the fuel line reaches the carb.

This valve is designed to cut off the fuel flow into the carb if the fuel level in the chamber reaches a certain level, pushing the float up and closing the valve. However, if the valve has gunk in it, it won't close fully, so the pressure from the fuel pump will force fuel past the valve and up & out of the jet.

Take this valve out (Once again, carefully...) and either give it a good wash out, or replace it...

#5 fbh

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Posted 16 July 2006 - 01:01 AM

Oh yes, and never ever ever ever turn a carb or sections of a carb upside-down to have a look at it....

#6 Frank B

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Posted 16 July 2006 - 08:01 AM

Rebuild the carb, replace plug wires, cap and rotor. It should be twice that milieage.

#7 GeneralDisorder

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Posted 16 July 2006 - 12:35 PM

First off - we need more info. What type of carb (Hitachi or Carter/Weber), and if it's computer controlled feedback or not - check for an 02 sensor.

GD

#8 Joe Palmer

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Posted 21 July 2006 - 07:32 AM

On my 83 brat the NOX filter went bad, I by capped it off on both sides. Horrible smell gone, back too 27 mph.

joe

#9 Sweet82

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Posted 21 July 2006 - 09:52 AM

I'm stupid, I'll ask...

What a NOX filter?




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