1985 Mazda RX7 Idle Bogs Out

1985 MAZDA RX7
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EJOHNSON1887
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  • 1 POST
The car runs find except when it trys to idle. Half the time it bogs out. It seems like the idle speed was set way to low. My question is what is the approiate idle speed on a 1985 mazda rx7 with around 144,000 miles? Also how exactly can i go about adjusting the idle speed?
Jan 21, 2007 at 6:54 AM
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COSMO
  • ✓Experienced Mechanic
  • 347 POSTS
I take it that this is a carb engine 12a.

Sounds like one of the air jets in the carb might be clogged with dirt. You can do an in car rebuild of the top of the carb if you need to.

The idle speed should be around 700-800 rpm give or take, depending on how it runs

Cosmo...Mazda Tech
Jan 21, 2007 at 8:09 AM

Suggested Repair

Suspect a clogged carburetor air jet on the 12A carb engine and consider an in-car rebuild of the carburetor top. Set idle speed around 700-800 rpm, adjusting as needed for how the engine runs.

Conversation Summary

The owner of a 1985 Mazda RX-7 with about 144,000 miles said the car runs fine but bogs out about half the time at idle and asked for the correct idle speed and adjustment method. The expert assumed a carbureted 12A engine, suggested a clogged carburetor air jet, and recommended an in-car rebuild of the carburetor top if needed. Idle speed was given as about 700-800 rpm depending on how the engine runs.

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