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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Occasional loss of power.Views : 1896 Replies : 41Users Viewing This Thread : |
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Aug 28th, 2018, 14:32 | #1 |
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Occasional loss of power.
A good few months back, maybe about 6 months, I put in an additive "Wynns Dry Fuel" to deal with lumpy running, probable/possible water in the tank.
As soon as I put the additive in, I would experience a loss of power for a few seconds, which I presumed was the additive/water mix going through and not burning like the petrol does. At first I got that loss of power quite regularly (every second day during a commuting week). Then it tailed off, but occasionally it still happens, such as today. Is it possible the additive water mix is still in the system after so long and at least a dozen tank fulls of petrol? |
Aug 28th, 2018, 22:21 | #2 | |
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Did you change the fuel filter? Not suggesting you do, just asking if you did.
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Aug 29th, 2018, 00:01 | #3 | |
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After looking into the MSDS and other references for that and similar products, i can confirm the main ingredient is methylated spirits and for the amount you get in the tub/bottle it's vastly overpriced. Much better off buying this : https://www.toolstation.com/shop/Pai...+Spirit/p99550 Buy the 2L version, it will treat up to 4 gallons/18L of fuel - anymore than that and it won't be effective. Chances are you've still got condensation in your tank and will have until you get the level down to about 1/4 tank or less then add the 2L bottle of meths, drive it until almost empty and then top up with fresh fuel. Try to use branded fuel, BP, Shell or similar, most supermarkets (except Sainsburys) use a variety of suppliers and the quality is variable. This should eliminate fuel as being the source of your problem. Then if the fault continues or gets worse, it could be time to investigate other things like the RSR, CPS and so on that can also cause loss of power. Also when do these power losses occur? Is it always after turning or on the over-run or when driving gently or what?
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Aug 29th, 2018, 11:30 | #4 | |
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Could there be crap in the filter that sometimes gets through to the engine and that causes the problem? |
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Aug 29th, 2018, 11:36 | #5 | ||
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That is why I think it is fuel related. |
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Aug 29th, 2018, 12:42 | #6 |
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Its also possible your fuel pump is failing, thats how mine went. Faily intermittent total power loss then no start.
Check how it sounds on priming, should be a nice high pitch whine and not grindy. |
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Aug 29th, 2018, 12:53 | #7 | |
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There could be other problems such as a weak fuel pump, overheated fuel pump fuse in the fusebox, failing pump or relay, faulty CPS (does the rev counter completely die when the loss of power occurs?) or something else, even a broken HT lead somewhere. You need to start somewhere, as you think it's fuel related, do the meths thing first and we can go from there.
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Aug 29th, 2018, 15:44 | #8 | |
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EDIT - did some checking https://www.volvoclub.org.uk/faq/Fue...blemsDiagnoses "Symptoms that may indicate low fuel pressure include hard starting, rough idle, hesitation, stumbling, loss of high-speed power, lean misfire (which may set an OBD trouble Bosch Under-Car Fuel Pumpcode) or pinging/knock due to low fuel pressure." The only symptom is loss of power under normal driving. I borrowed a code reader a few months back and there was no code related to the fuel pump. That would suggest it is OK. Last edited by Delta66; Aug 29th, 2018 at 15:57. |
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Aug 29th, 2018, 15:55 | #9 | |
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The revs do drop as the power drops, the car will not rev and even foot to the floor with the accelerator produces nothing, the car keeps slowing. I am now careful about foot to the floor, as the power returns all of a sudden and the car will shoot off. I replaced the HT leads a while back when trying to sort uneven idling. |
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Aug 29th, 2018, 16:06 | #10 |
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Delta. I can't advise. I am wondering in case it helps any advisers. Is it a loss of power as in total loss of power, or a significant reduction of power, a refusal to accelerate, a slowing down of the vehicle perhaps?
Reading between the lines I'm guessing a reduction of power. Dave. You mentioned the possibility of an over heated fuel pump fuse. Do the 700/900 cars have fuse boards designed for ceramic bodied fuses as per the 240? |
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