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Recently, on my 1987 CRX HF (carbureted and.

Tiny
BLUBABE52889
  • MEMBER
  • 1987 HONDA CRX
  • 308,000 MILES
Recently, on my 1987 CRX HF (carbureted and manual) a heater hose cracked and emptied the radiator, which caused the engine to overheat to an insanely high temperature. We replaced the heater hose and the car started fine, only issues were the idling issues that it originally had. But the next day, after the car sat overnight, I started it and the idle wont drop from 3000 rpm. Is this new high idle because the engine overheated? What could be causing it?
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Sunday, April 7th, 2013 AT 8:04 PM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Is the coolant level good? The automatic choke is assisted by a heater hose, if I am not mistaken

Roy
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Sunday, April 7th, 2013 AT 8:06 PM
Tiny
BLUBABE52889
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Yeah. The coolant level is good. Another thing I forgot to mention is that when it started idling at 3000 rpm, the pressure caused the fuel to back up and it started to come out of the fuel cap. Is this also due to the engine overheating?
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Sunday, April 7th, 2013 AT 8:08 PM
Tiny
ASEMASTER6371
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No, different issue entirely.

Roy
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Sunday, April 7th, 2013 AT 8:12 PM
Tiny
BLUBABE52889
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I wad told the thermostat could be sticking, so that's been replaced. Haven't found a vacuum leak, flushed the radiator, also replaced the transmission fluid because it has been slipping- thought it was low on fluid so changed it- which didn't help. It has new plugs, the timing was checked about a month ago, but I can't get the idle down to 1k to check it again. I am totally lost.
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Sunday, April 7th, 2013 AT 8:17 PM
Tiny
ASEMASTER6371
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See if the choke plate is all the way open that will allow the idle to come down

Roy
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Sunday, April 7th, 2013 AT 8:19 PM
Tiny
BLUBABE52889
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Okay. Any ideas about the fuel backing up like it did? Granted, the car does have 300k on it, which is a lot, but if I can fix it, I'm certainly going try.
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Sunday, April 7th, 2013 AT 8:23 PM
Tiny
ASEMASTER6371
  • MECHANIC
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I would be looking at the hoses to the tank, the evap hoses, for one of them to be blocked not allowing venting

Roy
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Sunday, April 7th, 2013 AT 8:25 PM
Tiny
BLUBABE52889
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After it warmed up, It seems the idle has fixed itself entirely. Even when it's warm it idles steadily now, not fluctuating like it was before. Hasn't died once. Thank you for your help, though. The info is greatly appreciated.
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Sunday, April 7th, 2013 AT 10:59 PM

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