02 CamaroSS

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:

02 CamaroSS

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.

Blackhawk777

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.

02 CamaroSS

The guy told me had a kit laying around and jusy wanted to see if the kit worked. It wasn't likehe tan yhe car on juice all the time, bit who knows. I haven't checked fuel pressure, but Ivan going to. I am also going to hook an obd 2 scanner to it. Should the scanner give me a pressure reading? The car has 105k on it so I'm changing the upstreams just for reassurance.

wssix99

iTrader: (5)

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.

02 CamaroSS

It's funny u mentioned the gas cap. Todays fuels evap at a much faster rate. I no this because if I don't start my 67 at least every 3 days, the bowls empty and it cranks for a while. The ring on the cap does have cracks all around It. I may go 2 the dealer yo get a replacement because I like the strap feature so I don't forget it. I haven't seen a locking or aftermarket period withvthe strap.

I don't no y only the drivers side was replaced and not in pairs. That should b telling in itself.

Blackhawk777

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.

02 CamaroSS

Mine definitely DOES NOT get good mileage 1 day and poor on the orhers. I wish I got a good day. Mine is ALWAYS bad. I did some math and around town I'm getting around 13.33mpg. My problen Is, I'm getting 13.33mpg whether I'm on city streets or the highway. I should be getting AT LEAST 18-20mpg on the highway and Im not. The mpg does not improve with highway driving.

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.

Blackhawk777

Yup that sounds about right. Problem is, the fuel pumps on these cars are kindof a bitch. Good luck to you at any rate

02 CamaroSS

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.

02 CamaroSS

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.

02 CamaroSS

Ok. 58psi running, 48psi key on/engine off. The time it took me to pick up my phone, load this page and type this info, its bled down to 46psi. About 1.5min.

Blackhawk777

Hmm.... Maybe an injector issue, or the fuel pump isn't maintaining pressure.

02 CamaroSS

The bleed down was with the key on/engine off, not running.

Blackhawk777

Ok, at this point I'd like to officially say I'm stumped. Since you've already had the o2 sensors out, I'd just replace them and see if it makes any difference.

02 CamaroSS

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.

xBrian

My .02 would be on the tune and the O2s. After reading this thread, I think maybe I should check my sensors as well.

02 CamaroSS

I asked him if he did anything to the ecu and he said no.

Blackhawk777

Keep us posted on how it runs with the new sensors. It is really bizarre that only one was changed. I usually do both if I have one crapping out, just for peace of mind.

tmdz28

iTrader: (2)

211 miles / 10.9 gallons = 19.35 miles per gallon. Does not seem too bad to me.

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.