2004 S60 T5M Doubled Fuel Consumption [Bad ECT] Topic is solved

[DrDan]

A leaky injector would lead to increased fuel consumption, but not to the computer showing it. I think the OP is referring to the value shown in the DIM, which the ECM computes from the opening time of the injectors. The case here seems to be that the ECM decides to inject surplus fuel. That's why I suspected a faulty sensor.

[grizzlyturtles]

If I pull the fuel rail can I tell what injectors are bad just by looking at them? I went to see if they were leaking the other day but the fuel line is metal (correct me if I'm wrong) and I couldn't prime the fuel pump to see leaks.

This may be a stupid question... but would irregular oil changes cause this? Car had an oil change around 131xxxkms and it sits currently at 136xxx.

[grizzlyturtles]

And as for clogging the cat, I stopped driving the car as soon as the issue started, so hopefully I didn't cause it to get too clogged. If I did that means I just install the cat less down pipe earlier

[93SCMax]

Are you positive you have fuel in the oil? Clean spark plugs don't match with overfueling leading to gas in oil. If you have fuel in the oil, I suspect an injector, either leaking (o-ring?) or stuck open. Double check the spark plugs again, if wet, note the cylinder.

Otherwise, I'd start with the easy stuff and change the coolant temperature sensor 1st...but this shouldn't cause fuel in the oil.

Irregular oil changes won't cause the oil to smell like fuel, or cause unusually poor fuel economy.

Could you have a fuel leak somewhere else?

[grizzlyturtles]

I'm not positive, no, but the oil did smell like gas. I guess I could go and do an oil change and have a second opinion on if there actually is gas in the oil. I simply went off of smell and it did smell like old or shitty gas.

There is possibility for a fuel leak, but having the car parked in the driveway for several days now and there has not been a puddle or a small spot formed from a leak. Even on the road before I stopped driving the car, there was no spot except for the small leak from the rear main seal.

[MDK]

Well GT..MDK here. I kinda stayed out of this one but, when someone was saying that the injectors are stuck open... that made sense to me. I've heard that happening to other people driving different "badges" not just Volvo's.. and yeah... that will ruin a converter. They are made of platinum? I think? I've heard men around here cleaning them with laquer thinner to unclog them... trade secrets.. I suppose

[grizzlyturtles]

There is no visible leaks from the injectors outside of the engine. My car does have the metal fuel rail with the two green clips that connect the fuel line to the rail. How can I pressurize the system and check for the leaking injector without the ability to leave the rail connected to the fuel line?

I'm going to call Car Quest (the only place that stocks Volvo parts near me) tomorrow and see if I can get a coolant temperature sensor. Hopefully that will fix all of my issues.

[grizzlyturtles]

So guys, quick update:

I replaced the coolant temperature sensor. I reset the average and it significantly dropped, down to around 14 L/100km. It is definitely lower since the amount that I was reading prior to replacing the sensor was I think 26 L/100km. But the issue still persists. The average was fluxuating heavily, and seemed to stop around 15 L/100km maximum and dropped to a nice 9.5 L/100km at the lowest.

When I parked in my driveway I went and checked the engine when it was running, and there was no leaks or anything in the engine bay, just a tiny amount of water right around the coolant sensor. When I got back in, the average was still climbing when at idle. I am going to change my oil this week, the gas is really scaring me, I do't want to have to do rod bearings too

[93SCMax]

Glad to see that helped.

If you are really dumping fuel into the oil, you can also check your dipstick for signs of fuel and the level might even be high.

Since you haven't reconfirmed wet spark plugs, I'm betting a little overfueling due to the sensor. You'll certainly know when you change your oil.

[grizzlyturtles]

I'm going to get an oil change tomorrow hopefully. I'm going to check it periodically throughout the day and the following days. If the gas in the oil issue still persists, I'm going to try to check the spark plugs after I drive. Maybe there will be fuel then.