 Low idle, braintrust ideas? |
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| oakdalecurtis |
 Jun 23 2025, 01:12 PM
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#1
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Oakdalecurtis  Group: Members Posts: 1,372 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California 
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76 2.0 FI, 130,000 miles, stock except for Crane Fireball electronic ignition.
Has been running flawlessly until the last week, now the idle has dropped to 4-500 rpm and stalling at lights. -The idle screw has always affected the idle rpm, now it makes no difference how far out the screw is set. -Removed air cleaner (has new air filter), air going directly into throttle body makes no difference to low idle. -Valves were done a few thousand miles ago I am taking it to my mechanic to have new spark plugs installed and remove the injectors to send in for a rebuild. I'm hoping this might affect the idle. Any thoughts on what might account for the lack of idle all of a sudden to point my mechanic towards? |
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| emerygt350 |
Jun 23 2025, 04:04 PM
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#2
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Advanced Member Group: Members Posts: 2,964 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Check your timing at idle when it is 'low'. Check to see if your mps is holding vacuum.
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| oakdalecurtis |
Jun 23 2025, 04:50 PM
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#3
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Oakdalecurtis Group: Members Posts: 1,372 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California
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QUOTE(emerygt350 @ Jun 23 2025, 03:04 PM)  Check your timing at idle when it is 'low'. Check to see if your mps is holding vacuum. Hi Emery, I know what the mps is, but at the risk of asking a silly question, how do I check the vacuum? |
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| windforfun |
Jun 23 2025, 04:54 PM
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#4
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Advanced Member Group: Members Posts: 2,057 Joined: 17-December 07 From: Blackhawk, CA Member No.: 8,476 Region Association: None
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Google it. You’ll enjoy all the reading.
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| rjames |
Jun 23 2025, 05:26 PM
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#5
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I'm made of metal Group: Members Posts: 4,291 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest
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QUOTE(oakdalecurtis @ Jun 23 2025, 03:50 PM) QUOTE(emerygt350 @ Jun 23 2025, 03:04 PM) Check your timing at idle when it is 'low'. Check to see if your mps is holding vacuum. Hi Emery, I know what the mps is, but at the risk of asking a silly question, how do I check the vacuum? Disconnect the hose going to it and use a hand vacuum pump like a MityVac to pull ~15inHg on it and see if it holds there for 5 minutes. If it won’t hold vacuum then the diaphragm inside it is probably cracked and needs replacing. |
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