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[Datsun 1200 encyclopedia]

Dieseling

(Difference between revisions)

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Category: Fuel System

Revision as of 01:59, 30 June 2012
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Revision as of 10:09, 6 May 2016
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[[Category:Fuel System]] [[Category:Fuel System]]
 += Why does my engine still try to run after I shut it off? =
 +Dieseling or engine run-on is a condition that can occur in gasoline powered engines, whereby the engine keeps running for a short period after being turned off, due to fuel igniting without a spark.
 +
Causes of "running on" (continuing to run when ignition is turned off) are most commonly these: Causes of "running on" (continuing to run when ignition is turned off) are most commonly these:
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* Idle too high. Should be 750 rpm or lower. * Idle too high. Should be 750 rpm or lower.
 +
 +* Open Chamber type cylinder heads. While these reduce emissions, they are more susceptible to run-on. Datsun fitted carburetors with [[Anti-diesel valve]] to these engines.

Revision as of 10:09, 6 May 2016

Why does my engine still try to run after I shut it off?

Dieseling or engine run-on is a condition that can occur in gasoline powered engines, whereby the engine keeps running for a short period after being turned off, due to fuel igniting without a spark.

Causes of "running on" (continuing to run when ignition is turned off) are most commonly these:

  • Air leak -- leak at manifold gasket, carburetor gasket, or any of the assorted vacuum diaphragms such as the distributor, air cleaner flap motor, or carburetor choke-pulloff.
  • Idle too high. Should be 750 rpm or lower.
  • Open Chamber type cylinder heads. While these reduce emissions, they are more susceptible to run-on. Datsun fitted carburetors with Anti-diesel valve to these engines.