D jet slow idle, Found this... |
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D jet slow idle, Found this... |
bobboinski |
Sep 24 2021, 06:11 PM
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#1
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Member Group: Members Posts: 198 Joined: 23-April 16 From: Petaluma Member No.: 19,929 Region Association: Northern California |
I have been fighting the D jet slow idle on my 1971 1.7. Have checked and rechecked everything. Bought a smoke machine. Bought a new timing light with advance. All new ignition parts. Checked MPS. Checked all sensors with ohm meter. Disassembled and cleaned Distributor. Good compression. So started disconnecting things. When i disconnected and plugged the vacuum retard I was able to adjust a 900 rpm idle with the (finally effective after removing vacuum retard) idle air bleed. So I did a search for "914 vacuum retard" and this link came up. Read the last post. Exactly fits my symptoms. I'm going to try what he describes tomorrow and see what happens. But I'm pretty sure I'm on the right track finally. Thoughts?
https://shoptalkforums.com/viewtopic.php?t=2513 |
dr914@autoatlanta.com |
Sep 25 2021, 09:18 AM
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#2
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914 Guru Group: Members Posts: 7,896 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
usually a too low idle that cannot be adjusted even when the dwell is perfect and steady at 50 and the timing perfect and steady at 27 btdc with the engine rpm at 3500 warm, is caused by too rich a mixture. This could be caused by a leaking manifold pressure sensor or too high fuel pressure.
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bobboinski |
Sep 25 2021, 12:31 PM
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#3
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Member Group: Members Posts: 198 Joined: 23-April 16 From: Petaluma Member No.: 19,929 Region Association: Northern California |
usually a too low idle that cannot be adjusted even when the dwell is perfect and steady at 50 and the timing perfect and steady at 27 btdc with the engine rpm at 3500 warm, is caused by too rich a mixture. This could be caused by a leaking manifold pressure sensor or too high fuel pressure. Both checked and fine. Even tried another MPS out of a good running car. The low idle persisted. Bumping the timing just a bit at idle makes all the difference. |
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