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Old May 15th, 2018, 23:54   #11
Laird Scooby
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What make are they?
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Old May 16th, 2018, 03:46   #12
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what is this dip beam/flash resistor people are referring to? I've never come across one before...

REference to a wiring diagram would be cool!
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Old May 16th, 2018, 08:18   #13
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Volvo plugs.
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Old May 16th, 2018, 08:19   #14
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The longer one is the light resistor the other injector resistor.
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Old May 16th, 2018, 09:41   #15
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huh - waddayaknow.

The diagrams I have (940 1995) show this as an electronic unit.
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Old May 16th, 2018, 10:00   #16
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So i think i may have found the problem. This morning I built a led code flasher and got on the fuel pin code 223 icv signal missing or faulty. Has a near new one on there but it was a cheapy one. Il try a bosch one from someone & see if it works.
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Old May 16th, 2018, 10:06   #17
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I was just about to mention the idle control valve, mine gets oil in and gums up. I think the breather pod is blocked on mine so it builds too much pressure in the crankcase and forces some oil out of the breather which in turn blocks the idle control valve and coats the throttle butterfly.

I get similar idle problems to you but not as bad, I find if I rev it into the higher RPMs on start up it usually idles better after that as it clears things out a bit (gives an oily smoke puff from the exhaust and then it's fine until it blocks up again).
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Old May 16th, 2018, 10:14   #18
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Quote:
Originally Posted by aardvarkash10 View Post
what is this dip beam/flash resistor people are referring to? I've never come across one before...

REference to a wiring diagram would be cool!
There you go Ash - Pg 26, item 7/75 :

http://www.myvolvolibrary.info/Tech_...ction-3-39.pdf

A law was passed here that from 1/7/86, all new cars must have dim-dip lighting. In simple terms, if the sidelights are on and so is the ignition (ie engine running) then the dipped beam headlamps should operate at reduced intensity. This was meant as an accident-prevention measure so people couldn't drive on sidelights alone after dark. Wikipedia explains the rest, although it disagrees with me on the date :

https://en.wikipedia.org/wiki/Automo...#Dim-dip_lamps

That would be why you've never come across it!

Some systems, notably Ford that was implemented by Bosch used a bespoke relay that was incredibly prone to failure and complicated to even try and fix. They were also f-expensive from Ford dealers. In the light of the EU throwing their toys out of the pram and the subsequent lack of need to fix dim-dip if it stopped working, mostly if it packed up it was ignored.
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Old May 16th, 2018, 10:18   #19
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Quote:
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Volvo plugs.
You're lucky then - they come pre-gapped to 0.65-0.7mm. Default gap on NGKs is 0.9mm which is way too large. No reason to suspect the gap would increase substantially over 1k miles so (for now at least) you can probably ignore them.

By the way, FYI the ICV won't effect running on the throttle - clue is in the name - Idle Control Valve.

Also, your Volvo can't be scanned with a generic OBD-II scanner, it still used Volvos own OBD system that isn't recognised as one of the default protocols.
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Old May 16th, 2018, 10:24   #20
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According service manual TP0005071 the reduced low beam (dim-dip) system was introduced in the UK only, starting from 1996.
"Reduced low beams for the UK:
The dimdip or reduced low beam is a new system for all vehicles. A resistance of 0.9 Ohm is used to lower the supply voltage to the headlights to about 9V."
You won't find this system outside the UK
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