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12-05-2019, 10:49 AM | #21 |
Senior Member
Join Date: Oct 2015
Location: Bay City Michigan
Posts: 1,050
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Re: Vacuum testing to diagnose fast idle
poor compression should be fixed. burnt or bent valve. maybe get lucky and its a bad head gasket. For worn guides you would need to take out the valves mine bent on the way out so got a new set of old style nos for $30. the valves cant grow. seats can be lapped down. but someone willing to do that amount of lapping will probably correct stem length.
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12-05-2019, 10:56 PM | #22 |
Senior Member
Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,354
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Re: Vacuum testing to diagnose fast idle
When you say loose valve guides, do you mean worn stem clearance, or not securely attached?
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12-06-2019, 04:01 PM | #23 |
Senior Member
Join Date: May 2010
Location: new britain,ct 06052
Posts: 9,390
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Re: Vacuum testing to diagnose fast idle
I would think worn stem clearance.
Paul in CT |
12-06-2019, 04:05 PM | #24 | |
Senior Member
Join Date: Apr 2018
Location: Mebane NC
Posts: 2,353
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Re: Vacuum testing to diagnose fast idle
Right, like the guides have worn away over time and now there's lateral movement as the valves go up and down, causing them to not perform as desired.
Edit: Wanted to share this response I got from a local "classic car restoration" shop when I emailed them to ask whether they would take on a Model A valve job: Quote:
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12-06-2019, 07:11 PM | #25 |
Senior Member
Join Date: Jul 2011
Location: Redondo Beach, CA
Posts: 5,849
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Re: Vacuum testing to diagnose fast idle
A stock Model A has ~65psi compression and bringing #2 up to specs is certainly not going to "blow the bottom out". I agree, find someone else...
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