1986 Isuzu Pup Rough Idle Dies

1986 ISUZU
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CRICKET3377
  • MEMBER
  • 1 POST
New problem.... The pup wont idle on its own... it idles VERY ROUGH and once I take my foot off the gas pedal, it dies... please.. any ideas????? Thanks so much...
Apr 6, 2006 at 5:12 AM
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KENB79764
  • ✓Experienced Mechanic
  • 52 POSTS
i have seen a few mid 80's isuzu's do this most every time it was a rubber diaphragm in the carb. the symptoms get steadily worse like yours. give me your email address and I will try to locate the exploded diagram and send it to you indicating the probable cause.
Apr 7, 2006 at 1:41 AM
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FLOYD ALEXANDER
  • MEMBER
  • 1 POST
the rough idleing on your isuzu could be due to the fact that your carburator has been tuned down. it is a simple adjustment to make, however when you turn the idle on it back up you may get worse gas mileage.
Oct 24, 2007 at 9:49 AM
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Suggested Repair

Inspect the carburetor rubber diaphragm, a common failure on mid-1980s Isuzus that worsens until the engine will not idle and dies when the throttle is released. Confirm the diaphragm before relying on a simple idle-speed adjustment.

Conversation Summary

The owner of a 1986 Isuzu Pup reported a very rough idle that dies as soon as the gas pedal is released. An expert said similar mid-1980s Isuzus usually had a failed rubber diaphragm in the carburetor and offered a diagram of the likely part. Another participant suggested the carburetor idle had been turned down and that raising it could hurt fuel mileage.

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