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 |
bobboinski |
Sep 25 2021, 08:12 PM
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#2
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Member Group: Members Posts: 198 Joined: 23-April 16 From: Petaluma Member No.: 19,929 Region Association: Northern California |
So with the retard disconnected and plugged-timing at idle of 850rpm right now is @tdc. At 3500 rpm it is @30 degrees BTDC. Connecting the retard pulls the timing back 3 fins (2 spaces don't know what that is in degrees) and results in barely running. Going to take it out tomorrow to see if it pings but at least the idle is resolved and I feel I'm on a good path with some numbers to work with. I'm assuming there is wear in the distributor somewhere allowing excessive centrifugal advance. Car has 105,000 miles.
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