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How does an engine with "bent valves" act

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Old Jun 24, 2009 | 01:01 AM
  #1  
IRONFIST's Avatar
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From: CALGARY, ALBERTA, CANADA
How does an engine with "bent valves" act

My car is missing slightly, its kind of intermittent, especially under acceleration.... feels like an electrical problem with the ignition.
BUT I did over rev the car and bent some pushrods, could I have damaged some valves as well?
Old Jun 24, 2009 | 06:19 AM
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It might act a lot like you describe. Did you get all the bent pushrods replaced?

Last edited by shoebox; Jun 24, 2009 at 10:50 AM.
Old Jun 24, 2009 | 09:46 AM
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Originally Posted by shoebox
I might act a lot like you describe. Did you get all the bent pushrods replaced?
Yah I did, I also over torqued a couple of the last rocker arms, I realized this when I put the car back together and it made more noise then it did with bent pushrods

Looks like somebody used one of my torque wrenches as a breaker bar for something and it's off by about 8 to 10ft/lbs. So I had to take it all apart and now it's running, no valvetrain noise, but its missing pretty good.
Old Jun 24, 2009 | 09:58 AM
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Could be a bad lifter also. Need to identify which cylinder has the miss.
Old Jun 24, 2009 | 01:59 PM
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Originally Posted by Z28SORR
Could be a bad lifter also. Need to identify which cylinder has the miss.
How do I do that?
Old Jun 26, 2009 | 11:51 AM
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Compression test.
Read the spark plugs.
Measure the exhaust temps, each cylinder.
Pull one spark plug wire at a time, see how much difference it make in the way it ildes.
Listen with a mechs. stethoscope.
Take the valve covers off and look for a short valve.
ETC. ETC.
Old Jun 26, 2009 | 06:54 PM
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I bought myself a set of 243's from Davenport Motorsports... I'll be throwing those on over the weekend, that'll tell me about any bent valves.
Old Jun 26, 2009 | 10:28 PM
  #8  
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From: tracy
scan tool if check engine light.

other way to see which cylinder is "missing" is by removing injector connectors one at a time. whichever one has the least effect on the motor would be the first one to inspect.

Jeremy
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