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I had this cobalt for a little over a year now and I've been trying to fix this problem. I checks compression and got 180, 180, 210, 210, and I have replaced the fuel injectors and the fuel filter. I have also checked and replaced the spark plugs, but none of them were bad when I replaced them. I've personally run out of ideas and I need some help on fixing this problem, thanks.
Spark plugs were ok, just old, a good half quart of gas at least, ran fine going out the road but starting on any incline will cause trouble. The coil packs seem to be ok as well. We did some more research and we are going to replace the HPFP and see what happens. Thank you for responding.
just a guess because the dipstick has quite a bit more on than when I put oil in it last time. What I mean is that the line where the oil ended on the dipstick has come up a noticeable amount. Also I have put less than 500 miles on the car since the last oil change and the oil is significantly darker than it was when I just put it in. That and the smell of gas it a lot worse than when I just changed the oil. Another thing, thank you for telling me that it is not a hpfp, I'm learning my car stuff and I've just read on other websites about it and I assumed it was something normal. Also sorry if I sound dumb with this, I'm just learning as I go.
Fuel is some how leaking into the engine through an injector.
Are you injectors new or used or rebuilt?
Any codes?
Possible your EVAP system is clogged or bad solenoid?
I was on the mobile app so I didn't explain the lack of hpfp well. The LSJ only has the in tank pump, and in stock form is a returnless system. I don't think a new fuel pump will solve the perceved fuel in oil issue.
If the oil level has come up noticeably on the dipstick I'd be more concerned about coolant getting into the oil, the engine coolant and supercharger coolant are separate. Driving habits can impact the fuel smell of oil, I had one used oil analysis (UOA) come back at trace for fuel and it had a noticeable fuel smell, and another UOA came back at 1% and I didn't think the fuel smell was any worse or better than before. When you say noticeable has it risen up 1/4 or more the distance between the add and full line?
It could be a stuck injector, or improperly sized injectors. If the car was modified and tuned for different sized injectors than installed it can cause serious issues. Post some pictures of the engine bay, try to get good pictures of the superchrager pulley, new injectors, old injectors (if you still have them), header, intake tube, and anything else that seems interested.
Post some pictures of the engine bay, try to get good pictures of the superchrager pulley, new injectors, old injectors (if you still have them), header, intake tube, and anything else that seems interested.
Add; Inside the coolant reservoir, inside the valve cover (thought the oil fill cap hole), and even the oil on the dipstick.
I don't think it's your issue... but run the car a bit if you can and then pull the hard plastic EVAP line off of the throttle body. If fuel comes out or it is noticeably wet from fuel, then that's your issue.
For that much fuel to get into the crankcase, you either have a stuck injector, a coilpack isn't firing, or fuel is being pulled through the EVAP system.
You can check the fuel injectors by listening to it idle. Touch each fuel injector with a screwdriver; you should be able to feel the injector "click" as it opens/closes. If you can't feel it, but your ear up to the end of the screwdriver and try to listen for it. You're essentially be using the screwdriver like a doctor's stethoscope.
It's gonna be a few days before I can get some of those photos but thank you for the suggestion. I also plan on running another compression test because when I first did it I was not quite used to it so knowing me I probably messed something up. The guy I bought the car from claimed that he didn't mess with anything other than replacing the air intake. I will add on that the guy also said that at 40,000 miles he had to replace the engine and it was still covered by a warranty so the new block came straight from Chevrolet. The car currently has 95,000 miles. I should also add while I wait to be able to take the photos that the problem happened before getting new injectors.
Last edited by Dixiespiderman; Oct 6, 2021 at 11:29 PM.
I don't think it's your issue... but run the car a bit if you can and then pull the hard plastic EVAP line off of the throttle body. If fuel comes out or it is noticeably wet from fuel, then that's your issue.
For that much fuel to get into the crankcase, you either have a stuck injector, a coilpack isn't firing, or fuel is being pulled through the EVAP system.
You can check the fuel injectors by listening to it idle. Touch each fuel injector with a screwdriver; you should be able to feel the injector "click" as it opens/closes. If you can't feel it, but your ear up to the end of the screwdriver and try to listen for it. You're essentially be using the screwdriver like a doctor's stethoscope.
By any chance could you tell me which line is the plastic EVAP line? Is it the one that is slightly to the right of the engine and on top?
I think you're talking about the right one. It's the only one connected to the throttle body. It has a little tab that you rotate around its axis and then pull it off. Real simple.
Thank you, I checked it and it smelled just like exhaust, there might have been a hint of gas but since it just smelled like exhaust I couldn't tell. Also, I went ahead and changed the fuel pump because of some occasional problems I've had and my car runs a lot better and the throttle response is a lot better. With the old pump it felt like there was no difference between half and full throttle. I'm still going to be checking my oil for a returning smell though, so it might be a few days again.
