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coolant leak and idle problem

 
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Old 11-05-2010, 03:16 AM
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coolant leak and idle problem

Ok so i just bought a 93 honda prelude si 2.3l with 4ws, knowing it had a bouncy idle, the guy who sold it to me told me it was the iacv causing the idle problem because a mechanic told him so, and when he unplugged the electrical cord on the front of the iacv, the idleing seemed normal. So i bought the car and after 260 dollers later and a new iacv the problem didnt go away (tried taking it back to autozone but they wouldnt take it because i installed it already and connected the coolant hoses to it, which apparently the iacv smelling like coolant is a chemical hazard and i dont get my money back). The cars idle shoots up to 3000rpms upon startup and goes down to 1500rpms and bounces inbetween 1500rpms and 2200rpms and it does not go away after the car warms up, anyone have an idea what is causing it? also there is a coolant leak infront of the drivers side. near the firewall is where its dripping down but i cant find the leak anywhere and ive looked for hours, could this cause the bouncing idle?

Last edited by HondaDavid; 11-05-2010 at 03:40 AM.
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Old 11-05-2010, 05:36 AM
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Re: coolant leak and idle problem

put a jumper in the service connector.. (below)



then start car...., pull iacv plug.., let warm up.

adjust idle screw on top of throttle body until rpm is 700/750..(after car is warmed up)

after adjustment, (while car is running) plug iacv back in.., car should rev up, and settle down.. turn off car, pull jumper, then pull battery cable for about 30 seconds.

should be fine...., if not, post results


also coolant needs to be bled of air.., your leak sounds like its coming from your heater lines, or water pump (look for drips over by the timing belt area, on the ground)
bleed air from coolant lines... (screw on top of the thermostat housing) when motor is warm, and thermostat is open
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Old 11-05-2010, 06:29 PM
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Re: coolant leak and idle problem

where exactly is the service connector, the picture didnt show up
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Old 11-05-2010, 08:55 PM
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Re: coolant leak and idle problem

ok so when the car warms up the idle is a little less bouncy but it still bounces like 1400-2000 rpms but i really want to get this car fixed anyone else have any ideas?

Last edited by HondaDavid; 11-06-2010 at 12:28 AM.
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Old 11-07-2010, 02:33 AM
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Re: coolant leak and idle problem

Anyone else have any ideas on what to do?
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Old 11-07-2010, 08:07 PM
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Re: coolant leak and idle problem

Air in the line and a leaking heater hose sounds pretty accurate to me...what have you found? The shop manual has a pretty clear set of instructions for bleeding the system; the bleed bolt is on top of the thermostat housing.
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Old 11-07-2010, 08:49 PM
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Re: coolant leak and idle problem

I fixed the Idle Problem but i still cant find the source of the coolant leak

Last edited by HondaDavid; 11-08-2010 at 03:03 AM.
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Old 11-08-2010, 08:57 PM
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Re: coolant leak and idle problem

There are three heater hose connections into the firewall. There's also a hard coolant pipe (with some hoses connecting to it) going across the bottom of the engine -- you'll have to get underneath the car to check that.
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Old 11-09-2010, 01:32 AM
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Re: coolant leak and idle problem

i was under the car and looked at those hoses and none were leaking : ( This is my first car(well second but the first sold after 4 days because i wanted a lude since i was like 9 and now im 17:o) i really want to get this lude in tip top shape
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Old 11-09-2010, 09:58 AM
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Re: coolant leak and idle problem

Steam clean the engine compartment, paying special attention to any hoses and of course around the radiator, let the car run... watch.

There are a LOT of hoses, it could be leaking from any where. Including, but not limited to the engine block. You have air in the system, Once you FIX the leak and bleed the air, as has been mentioned many times, you will find the issue will go away.

Have you downloaded the user repair guide yet? It is in the GEN specific forum in the stickies. Get it. Read it. Do it.
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Last edited by LilMsPrelude; 11-09-2010 at 10:01 AM.
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Old 11-09-2010, 11:57 AM
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Re: coolant leak and idle problem

see if the coolant is dripping out the bottom of your timing belt cover...... and also check coolant flow (removing radiator cap and visual inspection of flow) when your car is warmed up, and thermostat is open....

where i'm getting at here is the water pump.... look for drips out the bottom of timing belt cover, and check for coolant flow


and maybe the next time you turn on your heater, see if you can smell coolant, and check intirior for leaking coolant also
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Last edited by ben_deez; 11-09-2010 at 12:00 PM.
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