[Val Walkinshaw]

Low pressure Fuel pressure in the tank was ranging 50.
High pressure pump is ranging around 500

Blackstone oil analysis shows no fuel or any other contaminates.

Both O2 sensors seem to be appropriately responding both to the ECU and to each other. Neither appears erratic and voltage is spot on.

I've never posted a video, I hope this link works

https://youtube.com/shorts/hVr18AHooPE?feature=share

[ember1205]

No fuel in the oil would seemingly rule out the HPFP from leaking into the engine. The O2 sensors are seemingly in line. Sounds like cleaning the MAF would be a good step along with doing a pressure check on the fuel rail itself, and start checking for vacuum / exhaust leaks to be sure nothing odd is happening there.

[vince3]

How long has the rotofab been on the car? Since that is the only modification, I would start with double checking every connection and go through the rotofab instructions again.

[ember1205]

Originally Posted by vince3

How long has the rotofab been on the car? Since that is the only modification, I would start with double checking every connection and go through the rotofab instructions again.

Agree that this is something to look more closely at. When you change out the intake for a CAI, you create the potential to move more air into the motor and without also modding the tune to compensate for the extra air, the motor could end up running lean. While that doesn't -seem- to be case here (it appears to be running quite rich), it would be worth fully investigating. The simplest thing to do would be to revert back to stock and see what happens to the numbers.

[Val Walkinshaw]

Originally Posted by vince3

How long has the rotofab been on the car? Since that is the only modification, I would start with double checking every connection and go through the rotofab instructions again.

Originally Posted by ember1205

Agree that this is something to look more closely at. When you change out the intake for a CAI, you create the potential to move more air into the motor and without also modding the tune to compensate for the extra air, the motor could end up running lean. While that doesn't -seem- to be case here (it appears to be running quite rich), it would be worth fully investigating. The simplest thing to do would be to revert back to stock and see what happens to the numbers.

Rotofab has been on there 5 years. Issue with the fuel trim has been the last 2 years

[ember1205]

Do you still have the stock intake to put it back?

[Val Walkinshaw]

Originally Posted by ember1205

Do you still have the stock intake to put it back?

nope

[vince3]

Originally Posted by Val Walkinshaw

No tune
No mods.
It's my my HP module because I was looking at sending off a base tune file to them when I was thinking about a tune.

Maf should be . 2-.9 lb/min. Mine is reading 1.4 lb/min.

Those forums are a bit of a mess in my experience.

I also have used my bidirectional autel to do some snooping hence how I know about the lack of misfires.

My main problem is a rough idle at 600 rpm/stumble, small reduction in power (not proven but it feels that way) and gas mileage that started at 10mpg for some time under gentle driving that has now worked its way up to 18. I didn't drive the car much last year due to unfortunate circumstances so I'm trying to pick up where I left off with this issue.

You got a lot of conflicting info. You say you MAF is high for 600rpms and its 1.4lbs. The screenshot you posted is at 1000rpms and the MAF is at 1.4lbs. I guess wait for the weather to warm, then go for a drive and post of 5 minute log of the drive. I don't think you can post it here, but you can post in the Gen V section of hptuners, link it here for those to review. I can also see in my logs vs the video you posted, your o2 sensors oscillate different than mine. Mine goes low and high for longer periods, yours mostly stay low with occasional spikes. That could be because your are running rich, but my logs are the opposite. When go slightly lean, the oscillate low and when i'm rich they go high. I'm definitely not an expert, but i would log more channels. I just posted a log for your to review and compare to yours on Hptuners.

https://forum.hptuners.com/showthrea...559#post862559

[bishopts]

Here is a picture of the comparison of looking at the misfires in the misfire section of GM specific vs mode 6 in obd2 generic. These are from my camaro just after in got off work today. As you can see looking at it in obd2 generic in mode 6 will show misfires that the GM specific won't catch.

My fuel trim is slightly rich but not as bad as yours. I haven't looked into it but i think i have a spark plug wire failing again.

[bishopts]

Here is the path to this menu. Once you're there, scroll to the very bottom and that will be misfires per cylinder.

[Val Walkinshaw]

Originally Posted by vince3

You got a lot of conflicting info. You say you MAF is high for 600rpms and its 1.4lbs. The screenshot you posted is at 1000rpms and the MAF is at 1.4lbs. I guess wait for the weather to warm, then go for a drive and post of 5 minute log of the drive. I don't think you can post it here, but you can post in the Gen V section of hptuners, link it here for those to review. I can also see in my logs vs the video you posted, your o2 sensors oscillate different than mine. Mine goes low and high for longer periods, yours mostly stay low with occasional spikes. That could be because your are running rich, but my logs are the opposite. When go slightly lean, the oscillate low and when i'm rich they go high. I'm definitely not an expert, but i would log more channels. I just posted a log for your to review and compare to yours on Hptuners.

https://forum.hptuners.com/showthrea...559#post862559

my bad I had two videos at 600 and 1000 RPM. I posted the wrong one.
thanks for your insight
I will some snooping on the forum

[Val Walkinshaw]

Originally Posted by bishopts

Here is the path to this menu. Once you're there, scroll to the very bottom and that will be misfires per cylinder.

when I asked for pics of the tree menu it was because I was wanting to learn how to "rezero your airflow compensation." as you had said in a previous post. I don't know how to do that.

I am familiar with the misfire diag. DOne it many times hoping this was a bad spark plug but alas my count is only 1 as of the other day on cylinder 7.

[ember1205]

Just thinking here...

You mentioned that you were observing misfires... Lack of ignition could increase fuel present in the exhaust which could then "trickle down" to everything else you're seeing. If you haven't already, and since you have the pieces on hand, maybe this is a good time to swap the plugs and then swap the wires.

Misfires could be caused by a variety of things and some of the things on that list could be connectivity issues that could trace to the wires or even the plugs themselves and spark not getting through 100% of the time.

[bishopts]

Originally Posted by Val Walkinshaw

when I asked for pics of the tree menu it was because I was wanting to learn how to "rezero your airflow compensation." as you had said in a previous post. I don't know how to do that.

I am familiar with the misfire diag. DOne it many times hoping this was a bad spark plug but alas my count is only 1 as of the other day on cylinder 7.

I looked into that also. Apparently our camaros don't have that function like all other GM products so. I thought about changing the build to something that for sure has it like a malibu or equinox. But i needed to go to something.