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Some Testing Results - 3rd Ground? 1800 1971

posted by  RepairmanJackal on  Sun Oct 12 11:06 CST 2008
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last visit: Tue Jun 10 09:52 CST 2014
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Thanks. Given my past history with timing, I tend not to loosen the collar and I pull the whole thing as a unit. Of course the thing won't idle at all, so I can't do anything other than set static timing.

I've not checked the dizzy ohms yet but will shortly.

First off, the Volvo Fuel Injection Fault Tracing manual is a great resource. I keep forgetting about all the resources over at Volvo1800Pictures.com. Thanks Frederik!!

I was just out testing the Ohms of the sensors and found that most things are slightly below spec - but the coolant temp sensor seems to fail the standard volvo tests.

My sensor test results...
Ohms between the pins on the coolant temp sensor comes in at around 1990 when it should read between 2100 and 3100. It completely fails the pin-to-ground ohms test. The MAP sensor comes in at 93 ohms and 345 ohms, which is very close to spec (>90 and >350 are good). My spare MAP gave the same readings so I'm not too worried about that. The air temp sensor comes in at 255 when spec is 260+. Also a little weird, but they do pass the ground continuity test.

I'm actually thinking that I missed something important. From what I've read, I think there's a third ground strap (#1 battery to body, #2 bellhousing to frame) The fault tracing manual suggests that (#3) the manifold itself is also grounded to the body. I do kinda remember a third strap from manifold to the body... However, I have Ohm-tested the body to manifold a couple times and come up with "Infinite" so maybe this is not an issue.






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