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Bent Valve cause misfiring?!

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Old 11-16-2006, 06:17 PM
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Default Bent Valve cause misfiring?!
I just went to get my crx smogged with stock D15 engine and it didnt pass. The guy told me that HCM is high because due to bent valve and that it is misfiring is some rpm. Then it dawn on me. I overheated my engine a while back and i changed the headgasket and i only got the head resurface but i didnt get a valve job because i thought it wasnt worth paying $250 more for a D15 engine. So what would you guys suggest?
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Old 11-17-2006, 02:33 AM
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Default Re: Bent Valve cause misfiring?!
buy another head
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Old 11-17-2006, 02:37 AM
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Default Re: Bent Valve cause misfiring?!
but bent valve cause higher HCM? Thats unheard of....
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Old 11-17-2006, 11:40 AM
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Default Re: Bent Valve cause misfiring?!
unburnt gases flowing out the exhaust instead of being trapped in the cylinder and burning
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Old 11-17-2006, 12:04 PM
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Default Re: Bent Valve cause misfiring?!
WTF is HCM? I think you mean HC (hydrocarbons). And yes that would cause misfiring because that valve is putting raw fuel into your exhaust stream
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Old 11-17-2006, 01:03 PM
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Default Re: Bent Valve cause misfiring?!
do a leakdown test.
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Old 11-17-2006, 01:26 PM
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Default Re: Bent Valve cause misfiring?!
i always wonder whats the difference between a leakdown test and a compression test?
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Old 11-17-2006, 03:00 PM
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Default Re: Bent Valve cause misfiring?!
a leakdown test determines how well the valves and rings hold the pressure.
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Old 11-17-2006, 03:01 PM
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Default Re: Bent Valve cause misfiring?!
Originally Posted by hmtcrxsir
i always wonder whats the difference between a leakdown test and a compression test?
They're completely different, the only similar thing is you put stuff in the spark plug hole for both tests

Leakdown you shoot compressed air into the cylinder when it's at TDC on the correct stroke and measure what % of air is leaking out.
 
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Old 11-17-2006, 04:39 PM
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Default Re: Bent Valve cause misfiring?!
yep..and alotof ppl dont give importance to leakdown test.. ..
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