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  1. A

    3,9 EFI vacuum expected readings

    Hi all, many thanks for all the replies. My interest in this parameter derives exactly from what discool has reported: didn't find mention of vacuum levels anywhere in the manual, yet the book is populated with sentences such as "..a leak in the vacuum manifold..." "an air leak somewhere in the...
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    3,9 EFI vacuum expected readings

    Hello everybody, long time since my last post, which means not having troubles for quite a while. However it was time for a new ignition amplifier and I took the opportunity for an extended check as a parallel problem idling refuses to be at the correct RPM to start with and I can keep it under...
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    weird 3.9 idling

    Ok then I would greatly appreciate if you could please point me to suited gauges, just to have an example of what I'll be looking for, thanks. Just as an update, and to stress the intermittent aspect, yesterday it did run really awfully, on top of the hiccup at some point cylinder 5 stopped...
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    weird 3.9 idling

    Kev, The reason why I raised those questions is just the opposite: I think it would help a lot discussing those points, and I honestly think they are reasonable points as well. Each of us has a personal approach to solve problems, and comparing approaches is generally better than taking...
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    weird 3.9 idling

    If there is anything that could be said to be constant in this problem that would be it is intermittent. On the same run it does it only sometimes, and that can be either randomly (or what appears to be so) or only when under full throttle. Engine can be made to revv up by applying a very light...
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    weird 3.9 idling

    OK, so, as Kev suggests, these cars do seem to learn and adapt to situations with time. Mine is peculiar though as it seems to learn to be naughty instead of trying to improve.... A major hiccup is back now.. It is almost undriveable, I was on the motorwya today and I doubted I could make it...
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    weird 3.9 idling

    Hi All, Kev thanks for the info, it had to be 7 1/2, I couldn't think of any other combination. However I wonder how many times a bad quality copy/scan has misled some judgement/operation. I have found on the diagram the connection that senses the Heated Front Screen ON and tells the ECU, which...
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    weird 3.9 idling

    I just googled it... the oil pressure switch is to feed the circuit only when engine is running, so that one is solved. What I couldn't find is why or how operating the switch could modify idle....
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    weird 3.9 idling

    Hi, just to keep it alive, more news after refitting everything to place. First of all I discovered the mysterious relay+fuses are part of the front screen heater circuit. I picked it on a picture in the manual and then confirmed by operating the switch and feeling the relay vibrating. It could...
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    weird 3.9 idling

    Hi all, major update here…. I decided to take the long way and removed the right hand seat, removed the ECU, removed the plastic case from multiplug and carried out all fuel injection tests as per workshop manual. I was expecting to find faults either in coil-to-ecu or injectors or something...
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    weird 3.9 idling

    Sleeping over it brought some suggestions to me. As far as I understand it, although distributor and coil are in the list of objects to be tested in the section specific to fuel injection troubleshooting, the ignition circuit itself does not include them. Hence having sparks doesn't mean there...
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    weird 3.9 idling

    Just an update + unfortunately very bad news… I disassembled and completely overhauled the distributor, but didn’t find anything relevant that could point to pattern in the ability to trigger strobo response. No excessive play, wires are ok and pick-up resistance is within specifications. I...
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    weird 3.9 idling

    Hi folks, while waiting to have those tests made as suggested by kev, I checked a few things over again and discovered something “interesting”. First, the marks on the pulley are perfectly aligned to BTDC, so after reducing the CO trim down to 1 V as suggested I was ready to check timing, but...
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    weird 3.9 idling

    Hello kev, many thanks for taking the time to go over this matter again. While I will have to wait for trying the settings and adjustments you suggest (it' s pouring very hard these days, and alway at weekends or late afternoons when one has free time to spend...) I realize there is a gap in...
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    weird 3.9 idling

    Hi all, I did the search and found a post by Kev indicating the resistance value to be between 2K and 5K ohms, so I will check that asap ignition parts I read very often about the need to keep with original ignition parts. I tried to buy good quality, and still have old cap + arm. Old leads...
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    weird 3.9 idling

    Hello Kev, I will try to reply in between lines: distributor was disassembled + checked and it is the correct model. The wires are those you describe, I thought they have silicon rubber insulation, but may be I am wrong. However, do you happen to know the ohm readings for the pickup? I will try...
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    weird 3.9 idling

    Hi cooltide, what would you be inspecting in the timing/distributor system? I could only think of checking tha gap, and that was ok. Another possibility I thought of but wouldn't know how to check is the silicon wires inside the distributor. They move and bend every time the vac unit will act so...
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    weird 3.9 idling

    Hi Kev, tanks for your suggestions. I though I mentioned but only very early in this thread and only once, that the engine has been recently totally rebuilt. By saying totally I mean from changing cylinder liners on to everything that needed change. In fact I eventually kept only pistons +...
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    weird 3.9 idling

    Hi all, resurrecting this thread, but unfortunately no good news… Since my last post a lot of things had to be done in the attempt to cure the problem, and I can tell few things remained pretty unchanged. 1) all the trivial renewable (rotor arm, cap, leads and the like) + new vacuum unit on...
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    weird 3.9 idling

    Hi all, some new symptoms accumulated in the meanwhile and I thought I might update the thread. Idling is now down to1k, but for no apparent reasons. Nothing mechanical done after the plenum chamber replacement. May be it learns from experience.... Idling actually still fluctuates, now even...
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