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2004 V70 5speed non-turbo 225kmi. Misfiring, throwing the 0300 code. The car has about 3/4 tank of gas, and the weather was in the 30's a few days, then went into the 90's with extreme humidity for a few days. I thought maybe it was condensation causing the misfire, but with todays fascist gas being 10% ethanol I didnt think moisture was a big issue anymore? But I added a bottle of drygas just in case. Didnt help. I have drivin about 10 miles hoping it is going to cure itself, but it hasnt yet. I just got out on the highway, and found the engine will run ok, but with a skip. I get up to 65mph then the throttle stops responding and the rpms stick at 3000, and the car loses speed. I found that if I turn the ignition off while driving, then back on(not the safest thing to do while on the highway I know), it will let the throttle again be responsive. I know the common causes are the coil packs cracking and the camshaft sensor going bad. I figured it might be bad gas, but now I suspect its something else. Why would it throw just the 0300 code if it is not a specific coil pack that went bad? I had an issue a couple of years ago on this car throwing 0303 and 0305 codes, I switched around some coil packs with no change, and I fixed that issue by installing a new fuel pressure sensor. I can put a new camshaft sensor on now, but I am hoping one of you Volvo gurus might have some ideas on the best way to attack this issue.
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Sorry about the suggestions to replace the plugs. I just figured it was a cheap enough thing to just "go ahead and try".
To add a bit of confusion.... at 10 years old and 225K, it's time for the fuel pressure sensor to go bad if it hasn't been replaced yet. When it does start to go out it will cause random missfires across all cylinders. It rears its ugly head under heavy acceleration. Volvo had a problem with these around 2002-2004 (not sure of exact years) and issued a bulletin about it. For certain VIN numbers they will provide one free replacement. Call the Volvo owners help desk to get the real scoop rather than relying on a particular dealer. I've found they don't always respond the same.
We had sensor go bad on both my wife's 05 S80 (turbo) and my 03 V70 (NA) within the course of about six months. On the S80 she would get bad missfires when accelerating up an onramp, etc. but it took for ever to get a fault code and check enging light. On my V70 I got the CEL immediately - go figure. On at least one of the cars, I think the S80, I was able to attach a fuel pressure gauge and detect a fluctuating fuel pressure that coincided with the engine stumbling.
Just food for thought.....
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The plugs were a cheap try, why not. It gave me a chance to see that none were soaked with gas or antifreeze, so I was able to rule that out.
I did get the 0303 and 0305 about 2 years ago, and as you said it was the Fuel Pressure sensor. I replaced that and problem was solved back then. Strange thing was I never felt any misfire when those codes were coming up back then.
This time it is the 0300 random misfire, and it runs with a skip that seems to be very nonrandom. It also is more pronounced at lower RPMs. At times I can get the car up to 6k RPMs and it seems almost ok, but then it goes into in a sort of limp mode and restricts the RPMs to about 3k. This causes me to have to restart the car while moving, and then it allows the RPMs to get higher than 3k again for a short while. This car is a manual trans.
I received the Cam sensor yesterday and tried that with no luck, as Klaus suggested would probably be the case. I am hoping the coil pack I ordered shows up today and I will try that on top of each plug. If that is not the problem, I think I may be SOL, which would really be too bad because this car is spotless inside, seriously comfortable, and gives me 30mpg even at these miles(225kmi)!
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Well, I fixed it. The new coil pack I bought fixed it. I only bought one coil as a diagnostic tool. I started changing them out at cylinder #5, and started the engine each time and had no change as I went down the line. I had lost almost all faith as I got down to the last cylinder, and wouldn't ya know it, that was the problem! I still have no idea why it didnt throw the 0301 code instead of the random misfire, but regardless, my trusty old Volvo will live on!
Thanks to those who offered their help in helping me resolve this problem.
I will be buying a new full set of coils, as I expect the others to start going as well.
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Amazing. I also thought you should have received a 301. Only 9 years on a single coil pack? LOL
Our older cars need rotors/caps/wires sooner than that. At least the single coil lasts a bit longer, but when that goes the car doesn't.
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"...Our older cars need rotors/caps/wires sooner than that...."
True statement, Klaus. We become spoiled with today's reliability.
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Good show!
That makes me think that since the coil packs seem to have a finite life span, I should start grabbing them up whenever I see them at the P-N-P.
I told myself when I moved that I wasn't going to start stockpiling old parts again, but damn if it isn't hard not too! The first week in the new place I had to go to the P-N-P and get an interior door panel to canabolize the opener lever off of. I put the donor panel out for the trash collectors and they wouldn't take it. So guess where it is now.
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Your car has CVVT, continous variable valve timing, controlled by a solenoid at the top of the timing belt. The solenoid could be dirty and not funchioning as designed and at higher rpms with torque could be throwing the timing off.
The solenoid has engine oil pumped into it, so there are two oil lines with it. I do not know how to clean it or maintain it. I suggest looking around the web and see what there is to see...
If it idles fine and revs OK in neutral without throwing a code, this is a good possibility.
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I am not sure but the problem be a bad knock sensor. Is it possible to clean them.
I like the idea of buying an old set of coils or measure the resistance with a voltmeter.
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How old are the spark plugs and what type are they? I've had the best results in our Volvos with the plain old $2.50 NGK copper cores. At $10 it's almost sensible to just throw a new set in there. The fancy-shmancy designer fashion plugs never worked out very well for me.
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I can certainly throw a set of new plugs in. The plugs in there have been firing away for many, many, many miles. They were in there when I bought the car, and I know they are not the fancy ones(which I agree should not be used in a Volvo). But if it were a bad plug it would throw a specific cylinder code, and not the "Random Misfire" code, or so I would assume?
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I had a 1998 that gave me a P0300. I almost ran out of gas, actually I did but at the pump. When the engine died, before I could shut it off, the CEL came on and only one code.
Obviously, the P0300 is there because of emmissions rules and to try to get you to pull over because of the misfire condition on more than one cylinder. And that is the crux, more than one cylinder.
Should you get P0303 and P0304 and continue to drive, the P0300 takes over and stays there even if cyl 3 & 4 come back to life.
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I will have to try clearing the codes and rechecking after just a minute of driving to see if perhaps it shows an isolated cylinder code. The codes that it did throw were the 0300x2 and also 2 more instances of the same code as pending. I cleared them and it did the same thing after driving a few miles. What would you suggest as the starting point to diagnose the issue in the most logical, cost effective way?
I did order a cam sensor that should be in sometime next week.
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I would leave the cam sensor in the box for a while. Usually when that goes the engine refuses to start.
Did you pull all 5 plugs? Were they wet? What gap? (.028) Remember, misfires happen because the knock sensors detect a knock at the wrong time.
You should get a pending code just after start up, no need to drive around the block.
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I just changed out the plugs with a fresh set of NGKs. None were wet, and they all looked about the same condition. This had no effect on the skip while running. I took it around the block and it threw the same 0300 code.
I read that the coil packs can crack, and I wasnt sure where they crack, but didnt notice anything obvious while changing the plugs. I cant spend $350 just to try a new set of coil packs for this car due to the high miles on it, but I guess I can buy a couple of used ones and try changing them out to see what happens. Would this be the logical next step, or what else might I try?
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P0300 -- ECM-3100 -- Misfire, at least one cylinder -- Start-up
P0300 -- ECM-310C -- Misfire, at least one cylinder -- Catalytic converter damage
P0300 -- ECM-310D -- Misfire, at least one cylinder -- Emissions impact
P0300 -- ECM-310D -- Misfire, at least one cylinder -- Emissions impact this is the info I have on a dtc po300,, I would change out those ngk plugs and use volvo plugs, hope this helps.
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