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1999 Daihatsu Hyjet engine hunt

Tiny
INDIKA SILVA
  • MEMBER
  • 1999 DAIHATSU HYJET
Engine Mechanical problem
1999 Daihatsu Hyjet Two Wheel Drive Manual 120000 miles

I bought this car on year 2008, When the engine gets heated the engine start hunting. This will stop when the air conditioner ON. Also some times this problem not come. Please explained.
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Tuesday, March 10th, 2009 AT 12:26 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi Indika,

When surging occurs, it usually is due to excessive air going into the intake manifold and following are possible causes.

1. Faulty Intake Air Control (IAC)valve. IAC stuck in open position or not closing due to clogged coolant hoses.
2. Vacumn leakage at intake manifold, could be due to dislodged hoses or faulty PCV.
3. Idling speed adjusted too high.
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Tuesday, March 10th, 2009 AT 1:21 PM

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