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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Poor warm starting.Views : 819 Replies : 23Users Viewing This Thread : |
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May 15th, 2022, 20:15 | #1 |
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Poor warm starting.
I have an issue with the Volvo, where it starts on the button when the engine is cold regardless of the climate outside, however once the engine is warm then it's a pain to start up.
It will spin over fine, and fire up no problem, but it won't tick over unless I increase the revs for around 20 seconds, then it's good to go. Has anyone had an issue like this before? If so, what was your problem and how did you fix it Many thanks, Kelv
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May 15th, 2022, 23:18 | #2 | |
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May 16th, 2022, 00:08 | #3 |
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I would guess you're not using the correct hot start procedure. Press your foot halfway down on the accelerator and then turn to start position from zero, hold it there and gradually press the accelerator to the floor, releasing when it fires.
The problem will be worse in warm/hot weather and almost non-existent in cold weather.
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May 16th, 2022, 07:16 | #4 | |
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I would do as clan said and check the fuel pressure. Dave's guide could be a useful work around until the issue is found. |
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May 16th, 2022, 07:22 | #5 | |
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Very little wrong with the fuel pressure i would think, chances are the warm air intake valve has failed and is overheating the inlet manifold causing fuel vapourissation while stopped. Note that fuel vapourisation will give a percieved reduced fuel pressure and many will accredit the fault to low fuel pressure, usually changing the FPR to no avail. The fact is the simple, obvious stuff is being overlooked and incorrect starting procedure being used. To overcome this, many EFi systems have a bypass system fitted to increase fuel pressure when hot until the engine is started to overcome vapourisation.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ Last edited by Laird Scooby; May 16th, 2022 at 07:27. Reason: Add note |
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May 16th, 2022, 09:56 | #6 |
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Thanks chaps.
To be honest I've not needed to use the warm start technique since I owned a Triumph Acclaim back in 1994... Since then I've had mainly diesel cars, with the exception of a 1.8 Mondeo and a V6 406 Coupe, neither of which needed help on a warm start, so I'm a bit out of practice with the workings of a petrol car. I'll use the warm start technique fo a while and see what happens, however if this doesn't seem to have any affect then I'll start looking at fuel pressure/vapourisation issues. Dave, could you kindly help in locating the warm air intake valve and I'll cast my novice eye over it. Cheers, Kelv
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May 16th, 2022, 10:02 | #7 | |
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May 16th, 2022, 10:20 | #8 | |
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I think we may have overlooked something here... What fuel is it running? If it is E10 then you could very well have vapour issues thanks to the E10 boiling over at a much lower temperature than petrol. 7/900s have very hot engine bays when they're up to temperature. The old Bentley's I worked on would have an overflow pipe for the carbs, if you had to road test them for a service and then drain the oil while hot you would often get ethanol dripping on you and that was on E5! Last edited by 360beast; May 16th, 2022 at 10:23. |
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May 16th, 2022, 10:30 | #9 | |
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May 16th, 2022, 10:37 | #10 |
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In fact I've never done anything other than turn the key on a hot car.
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