Idling goes up and down

Tiny
ALPHEUS.LEKOTE
  • MEMBER
  • 1998 HYUNDAI ELANTRA
  • 258,000 MILES
I just overhauled the engine and when I start the car it starts on a first kick but with idling that goes up and down especially down. The ratiator boils after leting it iddle for about 30 minutes though the temperature on the indicator is fine. When I drive the car hesitate and pulls forward at take offs as well as at speed below 80km/h forcing me to press the accelerator a bit more. Is it timing or sensors? Please help.
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Thursday, February 16th, 2012 AT 7:58 PM

6 Replies

Tiny
BILLYMAC
  • EXPERT
Hi yes this sounds like a timing problem recheck the timing belt
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Thursday, February 16th, 2012 AT 8:01 PM
Tiny
ALPHEUS.LEKOTE
  • MEMBER
Hi! Billymac, you mean the timing is out maybe by one tooth or what must I check exacly?
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Thursday, February 16th, 2012 AT 8:12 PM
Tiny
BILLYMAC
  • EXPERT
Yes mostlikely it is out by one tooth this will cause these issues you have. Maybe not but we have to start there
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Thursday, February 16th, 2012 AT 8:19 PM
Tiny
ALPHEUS.LEKOTE
  • MEMBER
Thank you very much Billymac I got assistance from someone to set the timing for me and there is a big improvement but the idling is still not stable, when I start the car it idles at 1000 rev/min and slowly goes below 1000 rev/min as the car idles. There is one more thing that I don't understand now, the car can't drive smoothly at take offs especially at gear 1 when I release the clutch pedal without pressing the gas pedal it hesitate like and the engine goes off. Is it still timing problem? What can be the problem Sir.
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Thursday, February 23rd, 2012 AT 6:58 AM
Tiny
BILLYMAC
  • EXPERT
It really sounds like you still have a small timeing prob possibly a misplaced vac hose
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Thursday, February 23rd, 2012 AT 3:42 PM
Tiny
WRENCHTECH
  • EXPERT
The ignition timing is not adjustable. If it overheated, then you need to have the cooling system pressure tested to find the leak. The reason it's not idling right is likely because it's low on coolant. The IAC (idle air control) works off coolant temp and if it's low it will have air pockets that don't read.
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Thursday, February 23rd, 2012 AT 4:23 PM

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