Was out driving this morning. Car felt like it wanted to die when I put it into reverse. So, I scanned it. No CEL(check engine light) is lit on the cluster. But both codes are pending. Here are some screenshots.
Any pointers? Car has lately been cranking a little longer on cold starts.
Mods the car has. Just a Mina intake tube and BMC air filter.





I know it says to check for incorrect signal from ECTS, MAFS, IATS and TPS. But everytime I check those, I never see anything wrong. Air filter new. What are the correct fuel pressures for an aj27s? Maybe that's something I need to look into.

 

Based on your fuel trims, I would check that BMC air filter. I'm also running one and I find that it needs to be cleaned more often than a stock box with a K&N filter.

 

If it were the MAF, wouldn't the MAF readings be wrong?

Fuel pressure at key, primed 3 times. 42psi.
Running at idle, 39psi
Vacuum line removed from fuel pressure regulator, 50psi.
When I turn the car off, it goes from 39psi to 44psi. Currently checking bleed down times.

After 10 minutes, it's still at 44psi.

 

Maybe. Your fuel pressure readings are good, but the ECU is adjusting the mixture for some reason. There are other "Maybes" in there, too, with all the sensors feeding the ECU. Mine was throwing codes all over the place a few years ago, anything from the knock sensors to the EGR valve. The fuel trims were way out of tolerance, and when I drove up to the lake (Tahoe), I would get Restricted Performance out of nowhere (no CEL) above 6,500 feet. I cleaned all of the sensor connectors, based on other threads here in the forum, and BINGO!!! No more codes or Restricted Performance. I believe that you have the code charts, and those two codes show rich mixture on both banks. The first thing on the list of possible causes is the air filter. You've ruled out the blocked fuel return and fuel pressure regulator, so maybe a good cleaning of the connectors will help. It certainly wouldn't hurt and you can do it with a cold beverage in one hand.

 

Will do a cleaning, and reset them
And yes, those are codes for rich banks 1&2

 

Hopefully you get the same results as I did. I forgot to mention that I read the post suggesting the cleaning about four times before I actually did it. And, I didn't do the O2 sensors, yet. I'll do those when I replace the cats in a couple of weeks.

 

What were the MAF readings, fuel trims, etc before you changed away from an OE setup?

What were they shortly after you changed (after giving them time to relearn)?

 

My car has always thrown p0172 and p0175 at random since I bought the car. So, it did before and after the Mina tube and bmc filter.

Mina tube and bmc filter have been on the car for a month.

 

I've had my Mina tube and BMC filter for over 12 years with no problems when it's on there. I say that as I lived in CA for 6 of those years, so I couldn't use the filter all of the time. And, only once during that period did I have one of the smog-check shops tell me that the tube was illegal. He passed it anyway.

 

OK, so something was wrong before and still is. MAF is one suspect.

 

Do MAF's go bad or just get dirty?

So one of the of the possible causes is "leaking injectors". I guess based on my fuel pressure test, my injectors aren't leaking?

 

Even a dirty one may not clean.

If you've fairly even trims it's beyond belief that injectors are equally leaky on both banks.

 

MAFS can definitely go bad, and do it quickly. I had one go bad when I was on a trip. Drove there fine, but when I went to go to dinner, it was running very rough and blowing black smoke out of the tail pipes.Thankfully, I have AAA Premium which gives you a 200-mile tow once a year. It was 196 miles back home.

 

You are running way too rich, both banks. Had the same problem years ago with a 2008 SC RRS. Couple of cans of Lucas' Best Fuel cleaner (or BG 44k, or SEAFOAM) worked then, and about every sixty days when the problem came back.

 

The car has new fuel pumps and fuel filter. Since both banks seem to be about the same, I doubt I have leaking fuel injectors. Or are the fuel trims too skewed from bank to bank?I may give Lucas a try.

EDIT.
If an injector(s) on each bank is spraying too much fuel, would that show up as high fuel pressure on a fuel pressure gauge?

 

I wouldn't expect the injectors to be leaking; instead, spitting instead of spraying a fine mist. This gives a false reading and the ECU enriches with more fuel. At least that is how I understand the physics . . . .

Maybe one of the techs will weigh in . . . ?

 

No.

You'd get rich trims. (Because the injs added too much fuel.)

 

Thanks. Well if it is the injectors, I believe the s/c has to come off. If that is the case, so be it. I'll get the s/c ported if it comes down to it.

 

Try some cleaner first: unless your hands are just itching to turn a wrench!

 

Any recommendations on what injectors to buy? I can't find any oem injectors.

Also, I noticed that my readiness monitors are all complete, but one. "Catalyst Monitoring" could that be a cause of the rich banks?