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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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B230ET stopping.Views : 2135 Replies : 32Users Viewing This Thread : |
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Jun 21st, 2017, 18:22 | #11 |
Rogerthechorister
Last Online: Dec 16th, 2023 02:15
Join Date: May 2006
Location: Rochester
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Symptoms and air
The symptoms are identical to when the CPS was failing on one of my Sport Editions, and I was convinced that the OK running at over 40 mph was related to lower temperatures due to higher airflow - but of course in that case it was the temperature on the bellhousing and at the back of the engine that mattered.
There will be some frontal airflow from round the headlamp, the holes in the front panel next to the radiator, sideways from the radiator aperture, and possible (depends on the inner wing panel that I have not looked at this week) from the hole in the inner wing that some people modify to get a cold air intake into the airbox.
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B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold. |
Jun 21st, 2017, 19:16 | #12 |
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Original L-Jetronic then. Had the same system on a few Datsuns i owned when i was a young pup and also a resto project that never happened. Pretty bomb-proof because of its simplicity although in the late 70s (when the Datsuns were made) it was real cutting edge stuff and considered very complex!
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
Jun 21st, 2017, 20:53 | #13 | |||||
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Hey Dave - In the spirit of friendly discussion and to agitate my grey cells a a little, here's my tuppence in response - sorry for the threadjacking everyone else!
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Jun 21st, 2017, 23:27 | #14 | |
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We've both arrived by slightly different routes at the same probably conclusion for this, neither is right or wrong in the methods and/or clues used. We're just interpreting some things in a different way and from a different perspective but still seeing the same picture. For now though, i'm going to put my brain cell back in its jar and hit the pit
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Jun 22nd, 2017, 01:51 | #15 |
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I hate discussions that avoid referencing background info, so here we go.
Note especially pages 7 and 8 where typical fuel mixtures in spark ignition engines are outlined. L-jetronic in its various formats is designed to operate in a range that minimises exhaust emissions without compromising performance. Lean mixtures increase NOx output, rich mixtures increase CO and HC. L-jet avoids both situations by holding the mixture as close to lambda as possible ESPECIALLY at cruise - the only time the lambda (O2) sensor is included in the fuel calculations. We still agree on the ignition temperature thing btw! Sleep well |
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Jun 22nd, 2017, 02:38 | #16 |
🤍💙💗
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Motronic has no lambda sensor, so none of that applies. It runs quite rich at all times.
Motronic also has no hall effect sensor on the dizzy either. All it has is the 2 crank sensors reading the RPM and TDC from the flywheel. They are both the same and the part number is 0261210003. They were also used on some Porsche 928 and 944 models. Thankfully they are readily available on ebay: http://www.ebay.co.uk/sch/i.html?_fr...10003&_sacat=0 To test them unplug from the harness and using a multimeter you should get a reading of 1000 ohms between two of the three connectors if it is OK, otherwise it is stuffed.
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MY97 940 CD LPT Super Sports Edition 2 Turbo, Midnight Purple, 175,000 miles. |
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Jun 22nd, 2017, 07:32 | #17 | |
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Also the date of the publication makes me wonder if it's taking everything into account. The English translation was 1994 by which time L-Jetronic had "morphed" into Motronic in most applications although there were still a few around. Experience has taught me that manufacturers such as Bosch only release information like this to the general public when they already have a much newer product selling well in the market place for the simple reason they no longer want the monopoly on repairing it. A cynical point of view perhaps but in the main, true. Slept ok thanks - your turn to sleep now! Have a good 'un
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Jun 22nd, 2017, 08:26 | #18 |
Rogerthechorister
Last Online: Dec 16th, 2023 02:15
Join Date: May 2006
Location: Rochester
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No apologies
Please do not apologise for threadjacking - I see no threadjacking - all of this is very relevant to getting the grey lady running properly again!
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B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold. |
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Jun 22nd, 2017, 20:50 | #19 |
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No advice from here on - we have an America's Cup to win this weekend as well as some shabby provincial ex-european rugby team to thrash, so I will be somewhat distracted...
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Jun 23rd, 2017, 11:00 | #20 |
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As long as freak-weather conditions don't occur or you could be playing rugby on the deck of the racing yachts!
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