89 4.2liter carburator bogging problem - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 12-04-2002, 06:38 PM
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89 4.2liter carburator bogging problem

recently used nutter bypass and am still having a lot of lean running problems, can the coolant temperature switch still if bad be causing problems with the computer disabled?any help would be greatly appreciated.thanks
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post #2 of (permalink) Old 12-04-2002, 06:46 PM
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Re: 89 4.2liter carburator bogging problem

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post #3 of (permalink) Old 12-04-2002, 07:18 PM
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Re: 89 4.2liter carburator bogging problem

sorry, new at these things.
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post #4 of (permalink) Old 12-04-2002, 07:25 PM
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Re: 89 4.2liter carburator bogging problem

Thanks for filling out the profile! [img]images/graemlins/smile.gif[/img]

If the engine is running lean, it's not the CTO switch. The computer and it's input/output controls have all been deactivated.

More than likely the BBD Carb's metering pins are too far "in." IF the metering pins were moved furhter out then more fuel would flow, enriching the mix.

Did the engine start running lean after the bypass?
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post #5 of (permalink) Old 12-05-2002, 04:29 PM
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Re: 89 4.2liter carburator bogging problem

we did the bypass after putting a rebuilt holly carburator,because the old one seemed to be using too much fuel, but it seems at sometimes that it might not be opening up all the away at road speeds, and causing very poor gas mileage. the old carburator would get around 190-200 miles, the new one hasn't got above 150 miles and as low as 75 miles per tank. Do you have any ideas what this might be? thanks so much.
post #6 of (permalink) Old 12-05-2002, 08:56 PM
 
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Re: 89 4.2liter carburator bogging problem

200 miles pertank on a carter???? that is like awsome. Stick the carter back on with the metering pins pushed all the way out. good luck.
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