11-13-2018, 01:49 PM | #1 |
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Idle Issue
My 1971 Jimmy with the original 350 has recently developed a problem at idle. It runs fine for a minute or so then slowly begins to decrease to the point of running rough and threatens to die without feathering the throttle. When I do that it has some initial hesitation as well. The problem seems to have developed suddenly, not progressively. It runs fine down the road, no lack of power or ignition miss. Any thoughts or ideas on what could be causing the idle issue? TIA!
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11-13-2018, 01:58 PM | #2 |
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Re: Idle Issue
Whats your idle RPM?
Could be a vacuum leak. |
11-13-2018, 02:44 PM | #3 |
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Re: Idle Issue
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11-13-2018, 03:07 PM | #4 |
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Re: Idle Issue
It’s the weather!
Cooler moist air is the problem. It creates a colder intake. Cold fuel vapour inside the intake reverts back to a liquid. The liquid gas puddles in the intake. Some vapour gets to the chamber but is too lean to support god combustion. It runs rough. Cure is a heat soak. Usually when it starts to run rough if you shut it off for 5 minutes and wait for the hot air in the lifter valley to heat the intake then you’ll be good to go. |
11-13-2018, 04:32 PM | #5 |
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11-13-2018, 04:35 PM | #6 | |
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Quote:
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11-13-2018, 05:07 PM | #7 |
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Re: Idle Issue
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11-13-2018, 06:39 PM | #8 |
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Re: Idle Issue
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11-13-2018, 07:15 PM | #9 |
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11-13-2018, 08:37 PM | #10 |
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Mad remote troubleshooting and diagnosis, SeventyOne! I found the vacuum line to the PVC valve disconnected at a tee. Reconnected and it runs like new again! Thanks, and I appreciate everyone’s input! Hope to repay with some good advice of my own to someone in need in the future.
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11-13-2018, 08:41 PM | #11 |
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Re: Idle Issue
Awesome glad it was a cheap and easy fix!
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11-14-2018, 02:54 PM | #12 |
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Re: Idle Issue
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