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Bringing a 740 back to life

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Old Jun 20th, 2021, 19:25   #111
Challo
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Let me know how you get on Chris, don't forget to pull fuse #1 before you change the Lambda and refit after.
Well I finally got there and refitted the new sensor. Fuse removed and replaced once the new sensor was fitted.

Video taken of the car running and uploaded to YouTube. Might be me thinking it, but it defiantly sounds better.

https://youtube.com/shorts/8NkBa0Xu2MM?feature=share
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Old Jun 20th, 2021, 20:16   #112
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Well I finally got there and refitted the new sensor. Fuse removed and replaced once the new sensor was fitted.

Video taken of the car running and uploaded to YouTube. Might be me thinking it, but it defiantly sounds better.

https://youtube.com/shorts/8NkBa0Xu2MM?feature=share
That's much better Chris! You can see the voltage swinging up to 750-800mV which given your meter seems a bit slow to respond (most digital meters are) it's probably closer to 1V but by the time the meter is getting to the point whre it catches up the voltage is already on the way back down. An oscilloscope would prove that but not really necessary as you can see the lower voltage has a bigger swing downwards too.

Definitely sounds smoother, have you driven it yet and if so, does it feel more responsive?
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Old Jun 20th, 2021, 20:49   #113
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That's much better Chris! You can see the voltage swinging up to 750-800mV which given your meter seems a bit slow to respond (most digital meters are) it's probably closer to 1V but by the time the meter is getting to the point whre it catches up the voltage is already on the way back down. An oscilloscope would prove that but not really necessary as you can see the lower voltage has a bigger swing downwards too.

Definitely sounds smoother, have you driven it yet and if so, does it feel more responsive?
Thanks for the confirmation. Not driven it as yet, going to book in the MOT next Friday and give it a run prior to see how it goes.
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Old Jun 25th, 2021, 14:26   #114
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Finally bit of good news. The old girl has passed the MOT and will be put into daily use ASAP.

Plenty of little jobs that need to be addressed but the main thing is she is road legal and starting venturing out. Plus it means I can stick my Mini in the garage and get that fixed up ready for sale.

Thanks for all the help over the past few months. Very much appreciated
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Old Jun 25th, 2021, 14:32   #115
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Finally bit of good news. The old girl has passed the MOT and will be put into daily use ASAP.

Plenty of little jobs that need to be addressed but the main thing is she is road legal and starting venturing out. Plus it means I can stick my Mini in the garage and get that fixed up ready for sale.

Thanks for all the help over the past few months. Very much appreciated
Excellent news Chris! Congrats on the pass!

Any idea what the emissions are now?

Was it livelier as you drove to/from the test station?
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Old Jun 25th, 2021, 15:09   #116
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Excellent news Chris! Congrats on the pass!

Any idea what the emissions are now?

Was it livelier as you drove to/from the test station?

Left the paperwork in the car so will check later and let you know. Definitely left livelier and pick up was good.
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Old Jun 25th, 2021, 16:21   #117
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Brilliant news and well done on getting it back on the road!
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Old Jun 25th, 2021, 23:11   #118
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Excellent news Chris! Congrats on the pass!

Any idea what the emissions are now?

Was it livelier as you drove to/from the test station?
Says the CO was 0.487, and the HC was 99.
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Old Jun 25th, 2021, 23:33   #119
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Says the CO was 0.487, and the HC was 99.
That's pretty good on the emissions! Room for a little improvement but not much to be fair, considering the engine.

I'd be tempted to get the Carlube ATF-U out, 0.5L in the sump and a couple of eggcup fulls in the tank. Then every oil/filter change, after refitting the sump plug, first 0.5L of ATF-U followed by 10W40 up to the level, once a year 2 eggcup fulls in the tank should keep the engine sweet and clean and the various parts doing what they're meant to and the bit in the tank will keep the fuel system clean and lubricated.

Plenty of time to do that now anyway!
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Old Jul 9th, 2021, 14:44   #120
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Since the MOT managed a few local trips, but today took the old girl for a longer drive. Had the tracking done this morning, but it needs to go back as it pulls slightly to the left. Also there is some vibration at motorway speeds so will get them to check the wheel balancing.

Got back and noticed two issues to check on:

1. Start the car and it idles sub 1k rpm, but once up to temp and start in traffic in park it clicks up to 1100-1200k rpm. Any particular reason for this?

2. Coolant leaking inside and outside the car. Inside it’s the heater control valve, but I have the parts for that. Outside it’s dripping from the pipe which connects to the expansion tank. Going to replace that pipe, but not clear which one I need.

Checked PFV and they only have top or bottom hoses. I think I need top hose but unclear https://www.partsforvolvosonline.com...oducts_id=3950
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Last edited by Challo; Jul 9th, 2021 at 15:13.
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