Excessive Fuel Consumption
Thread Starter
Staging Lane
Joined: Jul 2010
Posts: 69
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What effects does nitrous have on o2 sensors? The guy I bought the car from ran juice through It before u got it. I just pulled the 2 upstream sensors and the drivers side is white and the pass side has some white as well.
Driver side:
Passenger side:
Driver side:
Passenger side:
Last edited by 02 CamaroSS; Aug 9, 2010 at 07:42 PM.
Thread Starter
Staging Lane
Joined: Jul 2010
Posts: 69
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Ok, I can POSSIBLY accept getting 13mpg around town, but I seem to be getting the same mpg whether I am on city streets or the highway and that I CANNOT accept. I know something is wrong, its just a matter of finding it.
TECH Resident
Joined: Feb 2006
Posts: 855
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From: Omahaish. Nebraska.
I know I'm not the best person to ask as far as nitrous goes, but those 02 sensors both show signs of being ridiculously lean, which WILL f*ck with your gas mileage badly. Did you check to see what kind of fuel pressure you are running? And if the original owner was running nitrous the car could be tuned for that, which could also kill your mileage. I'd at least check fuel pressure at the rails by hooking up a gauge on that schrader valve on the driver's side fuel rail. It's possible you aren't getting the required fuel pressure and it's cutting out at 4k rpm because of lack of fuel.
Thread Starter
Staging Lane
Joined: Jul 2010
Posts: 69
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I know I'm not the best person to ask as far as nitrous goes, but those 02 sensors both show signs of being ridiculously lean, which WILL f*ck with your gas mileage badly. Did you check to see what kind of fuel pressure you are running? And if the original owner was running nitrous the car could be tuned for that, which could also kill your mileage. I'd at least check fuel pressure at the rails by hooking up a gauge on that schrader valve on the driver's side fuel rail. It's possible you aren't getting the required fuel pressure and it's cutting out at 4k rpm because of lack of fuel.
Good idea. Something is fishy.. Your passenger side sensor is aftermarket and your driver looks OEM. I always replace mine in twos.
If the deposits show lean, then that wouldn't mach up with excess fuel consumption. Did you put on that locking gas cap yet? I wonder if the gas is disappearing before it gets to the cylinders - the pressure test should be telling.
If the deposits show lean, then that wouldn't mach up with excess fuel consumption. Did you put on that locking gas cap yet? I wonder if the gas is disappearing before it gets to the cylinders - the pressure test should be telling.
Thread Starter
Staging Lane
Joined: Jul 2010
Posts: 69
Likes: 0
Good idea. Something is fishy.. Your passenger side sensor is aftermarket and your driver looks OEM. I always replace mine in twos.
If the deposits show lean, then that wouldn't mach up with excess fuel consumption. Did you put on that locking gas cap yet? I wonder if the gas is disappearing before it gets to the cylinders - the pressure test should be telling.
If the deposits show lean, then that wouldn't mach up with excess fuel consumption. Did you put on that locking gas cap yet? I wonder if the gas is disappearing before it gets to the cylinders - the pressure test should be telling.
I don't no y only the drivers side was replaced and not in pairs. That should b telling in itself.
TECH Resident
Joined: Feb 2006
Posts: 855
Likes: 0
From: Omahaish. Nebraska.
Good idea. Something is fishy.. Your passenger side sensor is aftermarket and your driver looks OEM. I always replace mine in twos.
If the deposits show lean, then that wouldn't mach up with excess fuel consumption. Did you put on that locking gas cap yet? I wonder if the gas is disappearing before it gets to the cylinders - the pressure test should be telling.
If the deposits show lean, then that wouldn't mach up with excess fuel consumption. Did you put on that locking gas cap yet? I wonder if the gas is disappearing before it gets to the cylinders - the pressure test should be telling.
Thread Starter
Staging Lane
Joined: Jul 2010
Posts: 69
Likes: 0
It shouldn't add up, but my wife's mustang did just that when her fuel pump was crapping out. One day it would get normal mileage, the next it would be clear down to around 8 mpg highway. I couldn't even begin to explain why some days the pressure would be fine, other days it would go super lean, then a few rare days it was so rich it would spit gas everywhere out of the pipes..... I'd definitely check your fuel pressures and pump. An OBDII scanner won't show that. You have to hook up a mechanical gauge to the schrader valve I mentioned to see fuel pressure. All the scan device will show is what is being commanded by the pcm, not the actuals.
I will be installing a fuel pressure gauge. The specs I read were 54-62psi with the key on/engine off and the pressure should increase by 10psi while idling.
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Staging Lane
Joined: Jul 2010
Posts: 69
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So far I've done a resistance test on 5 of the 8 injectors and according to haynes, the resistance should be between 11-14ohms. I've got between 14.2-14.7ohms. Does that mean they need to be replaced? I haven't done the pressure test yet. That is next.
Thread Starter
Staging Lane
Joined: Jul 2010
Posts: 69
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i also noticed my gas gauge jump around a lot. Depending on which way the car is angled when I start it, the gas gauge reads different. It was just at empty now its at 1/8 tank. Only difference was the direction the car was pointing when I started it.
Thread Starter
Staging Lane
Joined: Jul 2010
Posts: 69
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So u think the fuel pressure is in order?
I ordered 2 upstreams today. I could have bought them from my local parts store, but I could only find Bosch sensors and I have been reading people saying to stay away from Bosch O2's. I did use 1 in my Rendezvous and it seems ok. I ordered Denso sensors and they half the price of the parts store Bosch's. They should be here in 2-3 days. I do have to say that, it seems since I pulled the sensors out to take the pics and reinstalled them, the mileage seems to have gone up a bit. HOW???, I have no idea. I am hoping when the guy ran the juice through it, it did something to them. The pass side is completely white and the drive side has white on it as well. I always associated white with being lean. Whenever my motor in my 67 was lean, the plugs were white.
Regardless of whether or not the upstreams are the issue, it will be reassuring to no 1, they are both new and 2, they both match. I came explain why the drive side was replaced and the pass side was not.
I ordered 2 upstreams today. I could have bought them from my local parts store, but I could only find Bosch sensors and I have been reading people saying to stay away from Bosch O2's. I did use 1 in my Rendezvous and it seems ok. I ordered Denso sensors and they half the price of the parts store Bosch's. They should be here in 2-3 days. I do have to say that, it seems since I pulled the sensors out to take the pics and reinstalled them, the mileage seems to have gone up a bit. HOW???, I have no idea. I am hoping when the guy ran the juice through it, it did something to them. The pass side is completely white and the drive side has white on it as well. I always associated white with being lean. Whenever my motor in my 67 was lean, the plugs were white.
Regardless of whether or not the upstreams are the issue, it will be reassuring to no 1, they are both new and 2, they both match. I came explain why the drive side was replaced and the pass side was not.
Heres the latest. Just filled up. Gauge read 1/8 tank and it took 10.9gal. so the gayge is reading correctly. That means the gauge can now be taken out of the equation. With that eliminated, I can now move onto either a sensor or objectors issue. This is the 1 reason I love my 67 much better than this. With the 67 there can only be a few things. With this, that list Is infinate.
BTW, the trip odometer read 211 miles and that was whike using at least 85% highway.
BTW, the trip odometer read 211 miles and that was whike using at least 85% highway.
I drove 75% hwy / 15% heavy city traffic and getting about 22mpg with the A/C on. But, I don't think 19mpg is bad at all.