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I have just bought this car a month ago and it was running well up until a week ago when I started experiencing some misfiring and engine power loss while driving, either accelerating and even once during cruise control.
Just starts hesitating until I play with the gears and get it out of that misfire.
The check engine light went on once and it read out P0090 (Fuel Pressure Regulator 1 Control Circuit) and P0190 (Fuel Rail pressure sensor circuit malfunction) upon me taking into the dealer for an inspection they found nothing wrong with it and reset the lamp.
now it is acting up again 3 days later and even worse but no lamp this time.
They said it may be the fuel pressure regulator and I read at some other forum it could be the spark plugs and coils.
Any suggestions?
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I've got your same problem and I registered to post it and get a response about it, but now I see no one has answered since august, so disappointing...
My engine started to misfire just after I took it to this "specialized" tuning place. They changed the OEM oil, oil filter, and spark plugs for: Liqui-moly 5w40 synthetic oil, K&N oil filter and Denso iridium plugs, they also cleaned the fuel injectors, I thought it was an upgrade worth the cash but it has been a regretful downgrade, I might as well had brought it to the dealers (which I'm doing on Monday first thing).
Since the "upgrade" the car misfires frequently (mostly on higher speeds) and the engine light comes on sometimes, but no codes, I took it to the tuning place mad as hell but after a 20 minute ride the car did nothing wrong and it didn't deliver any codes to the scanner (obviously a work of Murphy's Law!) They said that it must be the coils that are old and can't put up with such good plugs (B.S.) or that it's a problem caused because I normally use regular gas instead of premium (more B.S.) or, that is a problem I caused to the fuel pump because I'm not supposed to wait until the tank is 5 liters to empty for a refill (premium grade B.S.).
Doing a bit of internet research, I'm guessing its the new plugs that are causing the misfire, I think the gap is not right, or maybe they didn't plug the wires right? I don't know, any suggestions???
Having the same problem with my girlfriend's S40 turbo. Replaced the coil on the misfiring cylinder which made a noticable difference but its still misfiring. I am gonna change the plugs tomorrow. I may try premium gas also.
I found that the regular does not save you anything in these cars (turbo anyways). Your fuel economy goes down and the car runs like crap and will cause further problems. In the study that I did with my '02 S40, the drop in fuel economy burning regular instead of premium negated the $/gal savings.
They can run on 87 octane but they were designed for 91 or higher.
From the owners manual:
Octane rating
Volvo engines are designed for optimum performance on unleaded premium gasoline with an AKI octane rating of 91 or above. AKI (ANTI KNOCK INDEX) is an average of the Research Octane Number, RON, and the Motor Octane Number, MON. ((RON + MON)/2). The minimum octane requirement is AKI 87 (RON 91)
OK, so I took the car to the Volvo Dealership's Service Center and they said that for sure the "special tuning" place didn't "calibrate" the plugs, which I understand as if they didn't fix the gap on those famous Denso plugs to the size required by Volvo. Unfortunatelly, I have to wait untill they first fix a crashed back door (work of a stupid ass truck, thank you very much) for them to check the plug thing (and since all parts are being shipped from Sweden, I'm in for a looooong wait). I'll be posting results.
Now, I normally use Premium but I also use Regular. On the city, I have to be honest, the difference in performance is slightly noticeable. On the road it's another thing: the car performs much better with Premium, but still, Regular is not as crappy.
As for fuel consumption, the car gives me almost 600 km per tank with Regular, and no more than 580 km per tank with Premium. In my oil rich third world country, a full tank of Regular is around 15USD cheaper than a full tank of Premium. So, when there's cash flow and I'm thinking of taking the high roads, I always fill it up with Premium; if I'm sometimes short on the wallet, I'll take Regular. Now, I don't think using Regular sometimes (or even all the time, for that matter) is harmfull for the engine, since as stated in the manual (posted by AutoNaut above) the minimum required is AKI87. (Thinking about if Regular in Mexico is really AKI87...) Anyone thinks different???
Last edited by Licenciado Sabrosito; 11-11-2009 at 06:32 PM.
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2005 Volvo S40 T5 FWD engine losing power/acceleration
