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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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940 Rich start up.Views : 817 Replies : 13Users Viewing This Thread : |
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Apr 6th, 2020, 21:01 | #11 | |
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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May 31st, 2020, 10:13 | #12 |
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Last Online: Mar 26th, 2024 18:43
Join Date: May 2009
Location: Wembley London
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Update.
Both LPG filters changed.
Bosch CTS replaced as part of preventative maintenance. Did the fuse out, and M1 trip. Now much better at start up (Thanks again Dave). Plugs now at point six of a mm. Good colours. Running a bit smoother. And. Had a MBC fitted when I went to see Luke360 about some parts. I had one on a previous 940. Set at around 8 psi. Great fun, a welcome addition to life. Not done idle control valve cleaning yet but will soon. Still got the intriguing whoosh of air out when opening petrol cap, but that's non urgent, and I'll start a new thread, along with researching the traditional 'petrol gauge misbehaving' -stuck at 80 pc. I have some resistors, to check if it is the lovely sender unit rather than gauge. . . |
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Jun 2nd, 2020, 14:26 | #13 |
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Location: Amersfoort (NL)
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Ignition and LPG
The ignition voltage needs to be I believe 20% higher for jumping a spark in an LPG mixture when compared to a petrol mixture. So any deteriorating components or flaws in the ignition system will first show up when running on LPG, especially when accelerating. A smaller spark plug gap will just make it a bit easier for the spark to jump over.
Rob |
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Jun 2nd, 2020, 14:51 | #14 | |
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There used to be a device available many moons ago (probably outlawed by the H&S regimes) that could be connected between an HT lead and a spare HT lead to the plug, hinged in the middle with a scale and pointer and two pointed electrodes for the spark to jump across. Start the car and slowly open the gap until that plug just stopped firing then close it until it started firing again - then read the scale against the pointer to determine the firing voltage. It's 30 ish years since i used one so may have the method and/or description slightly off but the principle holds true.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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