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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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740 poor running and stallingViews : 21781 Replies : 119Users Viewing This Thread : |
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#31 | |
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#32 | |
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#33 | |
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(Photos attached of it disconnected) |
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#34 | |
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![]() DO NOT strip it down! ![]() There are parts inside that need special setting up procedures, you can try some carb cleaner through it once you've got it all back together and running on the car via the air intake on it but i wouldn't touch anything else other than making sure the electrical connections to the warm up regulator are good and clean and the hole in the bottom of the WU reg is clear and not filled with rust. Other than that, keep it upright, don't shake it, don't play with the air flap, just refit with new mounts and make sure the sock is intact etc as previously advised.
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#35 | |
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#36 | |
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#37 |
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When we had a mechanic around before he recommended getting a new cold start injector. I've just looked into the connection to it and noticed that there's rust sitting inside. Is this a problem?
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#38 | |
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You've had the engine running albeit not well which proves the cold start injector is working or that the mixture is close enough to get it to run anyway. The cold start injector only functions during cranking when the temperature is below a certain point (10C rings a bell but i'd have to double-check that) and then only for 8 seconds maximum so i seriously doubt that's the problem.
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#39 | |
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I've now tried everything on the list to no avail. Took out the spark plugs and noticed that as well as the spark plugs being sooted which I already knew, spark plug 3 was covered in fuel when I removed it. Using new plugs (with the correct gap) made no difference. Attached a photo of all of the spark plugs, closest to the driver on the left and furthest on the right. |
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#40 |
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Sounds like #3 plug lead is either defective or not making proper contact or #3 plug is defective.
The fuel pump whine will disappear, it's probably been a while since the pump could actually move at a sensible speed.
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Tags |
740, 940, b200e, stalling, throttle lag |
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