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I have an '85 S-10 Blazer with a 2.8 V6 automatic transmission, it has a high idle and a dieseling problem, the previous owner removed the fuse for the automatic choke, how can I reduce the idle?

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Dieseling or running-on is a fairly natural consequence of an engine that is idling too fast or being switched off before the idle has been restored after being revved.

Changes to engine design to improve acceleration and economy and meet new emission regulations required higher idle speeds and dieseling became a common problem which required the introduction of a fuel cut-off solenoid on many carburettors.

Dieseling is sometimes the result of overheating or too much carbon in the combustion chamber.

The design changes mentioned above required changes to carburation, including the choke design and operation. Complying with new emission regs required a quick engine warm-up and for the automatic choke to disengage in about two minutes. A higher fast idle was also required and mostly at least one vacuum servo was used to ensure smooth running during the warm-up period.

In order to disengage the choke quickly, it was often arranged to be heated, either by electricity alone or by electricity and hot water.

If the fuse has been removed the choke will not work correctly. Why the previous owner removed the fuse is a mystery, perhaps there is a fault.
The choke must be put back into good operation in order to achieve proper fuel economy and smooth running, or alternatively the carburettor could be converted to manual choke.

Posted on Apr 30, 2017

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