V70 Base- Power Lag Under 2k Rpms and Now Won't Start

alexv702003 · Post by **alexv702003** » 02 Apr 2017, 21:20

Hi, I have a 2003 V70 base non-turbo 2.4 fwd with 130k miles. My problem is that it has a lack of power under 2k rpms. The rpms climb slowly under 2k and once it reaches 2k rpms, it takes off and everything is fine. It is almost dangerous from a full stop. It has been like this since I got the car about 3 years ago.

I recently changed the spark plugs with Volvo plugs and am running a 89/93 mix for 91 octane (I have been running 87 octane before this).

Any ideas on this lack of power/slow climbing rpms under 2k?

Thanks for any responses.

Post by **June** » 03 Apr 2017, 02:22

What oil used? I noticed lighter weight oil seems to make a difference in acceleration. I have no idea why but when summer rolls around and I switch to 10w30 from 5w30 as required for my particular turbocharged engine, I always think the car feels sluggish with 10w30. Both weights are synthetic only I use. June

93SCMax · Post by **93SCMax** » 03 Apr 2017, 05:54

Changed the air filter or cleaned the MAF recently? Just a thought to improve air flow and ECU response at low rpm's.

Post by **oragex** » 03 Apr 2017, 06:56

I assume automatic?

It's the first time I read about such issue, so perhaps not something common. Any repairs done, fuel pump, PEM, FPS ? Can you read the FPS number, maybe it has the sensor for the turbo engines.

Maybe also check all these hoses are in place

Post by **chrism** » 03 Apr 2017, 11:07

Maybe the VVT isn't advancing/retarding properly. That "could" be affected by oil weight/cleanliness. Have you changed the oil recently? Are you running synthetic?

alexv702003 · Post by **alexv702003** » 03 Apr 2017, 19:53

Yes Automatic.

Yes I have been changing the oil with full synthetic 5w-30. I changed the oil about a week ago with mobile 1 5w-30 full synthetic. I also changed the air filter at the same time.

I drove the car to my father's house this afternoon and when I went to start it up tonight (about 4 hours later), it would start, stumble, then die. I had the same problem last year around this same time when the weather got warmer (I am in the northeast). I replaced the fuel pump and it was fixed.

Could the weather change affect the fuel pump or fuel filter? It is a Bosch fuel pump with only 5k miles on it and only 11 months old.

Post by **oragex** » 03 Apr 2017, 20:27

I don't think the fuel pump could be in cause if it's a Bosch unit.

While there, I'd clean the throttle body flap on both sides. Then have a look at the MAF wire - not saying it's related, but it's a good maintenance on this engine.

alexv702003 · Post by **alexv702003** » 03 Apr 2017, 20:47

Ok thanks, I'll look into that.

Any ideas why my car was not able to start tonight? It would turn over for 5 seconds max (each time was different) while the rpms stumbled and then die. I had the same exact symptoms last year and the fuel pump solved the issue. Idk why a Bosch pump would fail within 1 year though.

alexv702003 · Post by **alexv702003** » 03 Apr 2017, 20:55

I remembered that I have the steel fuel tank. Is the fuel filter serviceable on my car or is it part of the fuel pump?

Post by **oragex** » 04 Apr 2017, 05:26

alexv702003 wrote: ↑03 Apr 2017, 20:55 I remembered that I have the steel fuel tank. Is the fuel filter serviceable on my car or is it part of the fuel pump?

on metal tanks the filter is long life one and integrated with the pump

key word: PEM. at the right rear door, as you look underneath on top of the gas tank, you can see the module, it's secured with one screw. prone to corrosion. I believe it doesn't need reprogramming and can be replaced with a used unit