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Old 29 Dec 2012, 09:16 pm
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Default Erratic idle in 93 Civic Del Sol?

I am considering buying a 1993 Honda Civic Del Sol Si, 5 speed, for 1200 dollars from a preowned dealership. Everything looks fine, besides normal interior deterioration and some cracked parts in the passenger door panel. When we started the car up it fired right up, went to 2000 rpm, and stayed there. I thought it was just fast idling, but after it staying there for 10 seconds I asked the salesman what was wrong. He said he didn't know, and that it will rev up and down when idling. Sure enough, a few seconds later it dropped to 1000 rpm, then went back up to 2000 rpm, and cycled like this RrrrUUUUHHHH...RrrruUUUUHHH...rrrrrruuUUUUUUhhh. It runs fine other than that. What is this? I heard it could be the idle air control valve, or the fast idle valve, or even a vacuum leak or a PCV valve problem. I'm gonna have a mechanic look at it tomorrow, but I wanna know if it is worth buying this car. I have enough money, but I don't know how much it will cost to fix it. Please no short or vague, unhelpful answers. 10 points to the best answer! Thanks!
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Old 29 Dec 2012, 09:32 pm
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Find a picture online of where the IACV is just google it... take a screwdriver or something and tap on it with the handle of the screwdriver and it should stop for a few seconds .. or it could be air in the coolant system if not then watch this

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