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sounds like you have air in your engine coolant. you should have a bleeder valve somewhere near the thermostat housing metric size 12 nut , with engine off and cool remove radiator cap and loosen bleeder bolt add coolant to radiator until solid stream of coolant comes out bleeder then tighten bolt repeat if necessary, until all air is removed. hope this helps

that might be it but from my experience with hondas and especially preludes it is either the IAC valve located on the front of the intake manifold or the FIT valve located on the bottom of the throttle bodie. if you unplug the IAC it should be a very fast idol up and down that means that's not ur problem. if that's not it next check the FIT. there will be 2 coolant lines running to the valve and 2 10mm bolts holding it on. pull the FIt off and there will be 2 8mm bolts on the end will also have a Philips head. use the *mm to take the plate of and there will be a big white ring with a silver dome shaped piece of metal in the middle take a big screw driver and stick it in the slot on the white ring, and tighten the ring back down. over time these things come loose and will cause idol surge. preludes are nitorious for it.

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โˆ™ 2011-09-12 07:53:32
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Q: 98 Prelude idle surges with no check engine light or code What should you check for?
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