Necam EGI DFCO valve
There is a valve (DFCO) sitting in the bottom of the distributor. To test this, with the engine running, pull its plug-connector. Your engine should stop immediately.
If this test fails, the DFCO membrane is not working as it should.
Stretch the spring which sits under the rubber diaphragm/ membrane of the distributor. If this fix fails, you will need to buy one of those Necam distributor rebuild kits you see on eBay. Remove the aluminium cap at the bottom of the dizzy. Change the diaphragm/ membrane.
Sometimes the small rubber-tip of the DFCO valve is worn. Fortunately a new DFCO is not an expensive part. Be aware there are two versions of this part. Cost about £40 on eBay.
More on Dizzy cleaning
Clean the dizzy V-grooves with a 0.15 mm feeler gauge, but nothing larger. The kits usually come with one. The slots are soft and easily damaged. If one slot is particularly clogged, being made for a 6-cyl engine, swap it with one of the spare connections on the distributor.
The stepper motor itself is not easy to check without changing the part. Sorry.
To pressure-test the vaporiser and distributor you need an M6 screw thread. I’ll cover that when I’ve a mo’
WORK IN PROGRESS
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Bifuel V70 Classic 1999 [The Old Grumpy in the Corner, "When I was a lad... blah, bl**dy blah."]
Last edited by CNGBiFuel; Apr 8th, 2018 at 16:10.
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