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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 : 21725 Replies : 119Users Viewing This Thread : |
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Aug 20th, 2021, 17:33 | #11 | |
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I'm struggling to see an ECU with tubing to it, I have attached photos of what it looks like under there. |
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Aug 20th, 2021, 17:49 | #12 | |
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The ECU is outlined in blue, the green hose (other end is on the inlet manifold) is the advance and the rubber elbow/connector is in the bit where the blue and green cross to make a weird slug-shape. Make sure that elbow is on the stub at the back of the ECU, isn't split or perished and that the neutral coloured pipe/hose is also secure in it. Also worth checking on the inlet manifold end to make sure the stub on the manifold isn't blocked, if so some carb and air intake cleaner will help clear it.
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Aug 20th, 2021, 19:34 | #13 |
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Aug 20th, 2021, 20:30 | #14 |
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So the elbow on the ECU is fine and the tubing itself is fine however the inlet manifold elbow is in poor condition, you can see this in the original photos that I uploaded with my original post (I've linked that pdf again). This was one of the first things that I wanted to replace but held off as I have no idea where to find one of these. Now that I think of it I could probably just order some non kinked tubing the same size and use that instead.
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Aug 20th, 2021, 21:29 | #15 | |
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Aug 24th, 2021, 17:56 | #16 |
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So I've checked the plug gaps and they were set to 0.8mm so I've changed them to 0.7mm. I ran the engine with the Methylated spirit, started strong but made no difference after 15 minutes of idling. Started it again about an hour later and the car stopped dropping in idle but the throttle would go up and not come down for about 10 seconds. Tried it again the day after and it was back to square one.
Here's a video: https://youtu.be/fqS72I7ArDY I'm gonna carry on working with the other suggestions. |
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Aug 24th, 2021, 18:33 | #17 | |
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Last edited by Beadybc; Aug 24th, 2021 at 19:30. |
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Aug 24th, 2021, 20:24 | #18 | ||
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I'm fairly convinced that sock is either loose, perished or split or not fitted properly.
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Aug 25th, 2021, 14:17 | #19 | |
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It has an arrow on it pointing downwards, not sure what it is indicating and I can't find any information on it as I don't know it's official name. |
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Aug 25th, 2021, 14:28 | #20 |
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740, 940, b200e, stalling, throttle lag |
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