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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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May 16th, 2018, 17:41 | #41 | |||
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I wonder about the inlet manifold gasket, i think the pink visible ones can leak but thater, green, not easily seen don't?
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May 16th, 2018, 17:57 | #42 |
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I sprayed some carb cleaner around all the injectors & manifold no change in rpm. I have sprayed soapy water on air hoses & joints no bubbles or leaks visually checked hoses for splits or oil damaged parts that might collaps. Just done a draw test to see if the voltage regulator was acting up but all is ok.
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May 16th, 2018, 19:30 | #43 | |
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As for spraying soapy water on the various air/vacuum hoses, again it won't work. There's no air pressure there, especially on the vacuum hoses so you won't see any bubbles. What are you calling a draw test? I'm guessing you put a voltmeter across the battery terminals with the engine running? If so, what did it read?
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May 16th, 2018, 19:38 | #44 |
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agree not a very good way to test i heard gas was also good so i tried that as well again no change. Draw test was 13.4 idle 14 on load 12v engine off.
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May 16th, 2018, 20:14 | #45 |
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anyone disconnected the injectors in turn yet?
Or are we assuming they are all operating ok? Engine is running lean apparently. No vacuum leaks apparently. No idle control fault apparently. Hmmmm - what else is in the mix, easy to get to and takes 30 seconds to isolate? |
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May 17th, 2018, 07:02 | #46 | |
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Bloody glad we didn't have that crap over here! |
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May 17th, 2018, 07:42 | #47 | |
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May 17th, 2018, 09:40 | #48 | |
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https://www.volvoforums.org.uk/showthread.php?t=281270 That's on a 1995 car. I had a dim-dip resistor on my 1988 740s (not looked for it on my current 760) yet the Haynes Book of Fantasy shows a similar circuit to the ones linked to above. For some reason Volvo show this similar diagram in all their dim-dip circuits but all of them that i've come across have had that resistor. One of the quirks of UK models!
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May 17th, 2018, 09:47 | #49 |
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I had idle issues, where the idle was uneven, which was massively improved by simply removing the ICV, blasting it with carb cleaner and refitting.
A more recent idle issue, where the idle had dropped, was cured by adding a petrol system cleaner additive. This has various diagnostics and suggestions for idle problems; https://www.volvoclub.org.uk/faq/Eng...#Idle_Problems |
May 17th, 2018, 10:41 | #50 | |
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I did have a leak caused by the inlet gasket. I hadn't tightened up the nuts evenly enough and the manifold was kinda on at an angle leaving the disti end end a bit loose and the gasket uncompressed. It didn't leak, but eventually the gasket got brittle and a bit cracked and broke off. Didn't cause idle problems though, as was small enough to be compensated for by the idle valve. Make sure the gasket compression is even at either ends of the manifold. |
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