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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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1800s ELECTRICAL QUERYViews : 908 Replies : 7Users Viewing This Thread : |
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Nov 20th, 2018, 17:05 | #1 |
VOC Member
Last Online: Dec 3rd, 2022 08:18
Join Date: Nov 2018
Location: STOCKPORT
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1800s ELECTRICAL QUERY
Hello - I am new on here having just joined the VOC. I have a 1968 1800S which I drive regularly and it has been incredibly reliable - until just recently.
What happens is this: It will be contentedly ticking over when suddenly the rev counter needle starts to jump about and then the engine just stops. Usually it will re-start when I turn the key and after a few seconds of steady running, the problem repeats itself. Mysteriously, it will often then run for a couple of days without any problem - then suddenly do it again. The other day I was driving along at about 50mph when it suddenly started happening - the rev counter started to jump and the car kept hesitating and struggling to go, then it righted itself again and was fine after that. Any idea what may be causing this? Have wiggled all the wires on the coil and the distributor (while it was running) without any effect. Someone suggested it might be a faulty coil? Any help would be welcome. |
Nov 20th, 2018, 20:03 | #2 |
Master Member
Last Online: Mar 28th, 2024 14:15
Join Date: Apr 2012
Location: Droitwich
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I had a similar thing on my Amazon a while ago, which turned out to be the electronic doings I had replaced the points with. Put points and condenser back and everything fine.
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Nov 20th, 2018, 21:45 | #3 |
Premier Member
Last Online: Today 13:32
Join Date: Jul 2007
Location: Connecticut, USA
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R55;
Welcome to this forum! First question(s) must always be: Has any work recently been done, especially on the system exhibiting issues, and if so, what what it. If none, symptoms you are describing could be ignition or fuel supply, but more likely ignition, particularly because of action of the Rev Counter just prior to complete loss of function. [Point of info: Rev counter monitors Ign Coil primary current, which Points (should) break relatively cleanly because of the quenching action of the Condensor.] ...but Condensors available in recent years, even Bosch labeled, have been less than reliable...no, worse than that: Horrendous!...and a failing Condensor allowing the primary current to break noisily would manifest itself as multiple hits in the Primary current, which in turn would be interpreted as a high RPM and indicated as such. I believe this would explain the symptoms and cause, but component replacement will confirm this. I recommend you replace the Ign Condensor with new, Bosch labeled one (probably still the best available), replace nothing else(!) and seeing if symptoms remain. Please be acutely aware of the centering of Pointsbolt. See also: http://www.sw-em.com/Volvo%20Ignitio...ition%20System Yes, the ignition coil is failing to provide a spark, but not because it has failed, symptoms are a result, not a cause. Good Hunting! |
Nov 22nd, 2018, 17:54 | #4 | |
VOC Member
Last Online: Dec 3rd, 2022 08:18
Join Date: Nov 2018
Location: STOCKPORT
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Quote:
My mechanic was certain the problem related to ignition. So what he has done is bypass the ignition switch on the dashboard and replaced it with a direct feed (fused) via a small toggle switch. Now when I turn the key, the dashboard lights up and if I turn the key a bit further it will crank the engine, but the engine will not start until I flick the switch. This has bypassed the ignition switch behind the ignition key barrel which he believed had a fault on it and which Brookhouse Parts tell me is no longer available. So far today I have driven the car without any problems. I am hoping this has therefore solved the problem and gives me the extra benefit of a hidden cutout switch which adds extra security to the vehicle, so I am very pleased with the result. I am planning a longer journey tomorrow in it so hopefully I wont have any problems. Thank you again for your help. Last edited by RIDDLER55; Nov 22nd, 2018 at 17:56. |
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Nov 22nd, 2018, 19:34 | #5 |
Premier Member
Last Online: Today 13:32
Join Date: Jul 2007
Location: Connecticut, USA
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R55;
There is little arguing with success, but you might want to undertake a shorter shakedown drive in order to build some confidence in the repairs (as I recall, your symptoms were intermittent!)...and if you are still using the Key turned into Pos 4 against the Gorilla Spring to start, beware it will eventually succumb to fatigue (Ref. http://www.sw-em.com/ignition_switch...ch_article.htm ). The recommended modification is to install a momentary "Start" switch to take the place of Pos 4 of the key to prevent future key breakage. From your description of function, I expect your mechanic has made other changes, that may even include an electronic ignition module. Cheers |
Nov 23rd, 2018, 09:18 | #6 |
arcturus
Last Online: Today 07:17
Join Date: Mar 2006
Location: Sagres Portugal
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The problems described by the poster were encountered on my 144 with 123 dizy. The wisdom of the manufacturers when I returned the dizy for examination was that the electronics were affected by "spiking" An adjustment was made to the soft ware to make it less sensitive and the problem was solved.
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life's too short to drink bad wine |
Nov 24th, 2018, 22:38 | #7 |
Junior Member
Last Online: Sep 11th, 2022 21:59
Join Date: May 2012
Location: Ooop North
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Riddler55,
Another 1800 in Stockport; I know of five in the town (including mine)! There is a black '62 on display in the new main dealership on St Mary's Way; have you had a look at it yet? Happy motoring! Mr Thirsty |
Nov 29th, 2018, 22:48 | #8 | |
VOC Member
Last Online: Dec 3rd, 2022 08:18
Join Date: Nov 2018
Location: STOCKPORT
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Quote:
I am only aware of one other in Stockport - Davenport area. Where are all the others and how come I never see one? Always out in mine! |
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