just inspected/passed, now throwing codes at me

[workingonit]

Originally Posted by jdstrickland

YOU said that you had P0171/P0174, "lean misfires, bank 1 and 2." This is a false statement. You have a lean fuel mixture, but you do not have misfires, at least not from these codes. All you have is Lean, banks 1 & 2.

I must've misread "mixture" as "misfire", on my small phone screen in bad lighting. Not the first time. I didn't think twice about it, nor did I bother to check misfires for all cylinders, since I was pretty sure I had/have a vacuum leak somewhere.

I guess I've grown lazy & careless since I retired from active car maintenance/modifications (about 2008, when I stopped racing), and just about everything else, when I retired from work (1-1-2016). Doing a little at a time, as required, slowly....

[workingonit]

I've just received the new non-OEM "Camshaft Position Sensor" (exhaust side) to replace the one currently giving me the P0365 codes (twice, only recently). I haven't pulled the one on the X5 yet, so I don't know if it's a BMW part, a crappy Chinese replacement (though I've found some Chinese knock-offs OK, but not many), or cracked/broken or what?....

While researching sensors online, I've decided it's a crap-shoot, so I at least tried to get a "German-made" part. If it is indeed made there, oar in a German-supervised plant, it probably will work OK. Actually, I've always had better-than-average luck with European parts, so far, especially German (but I'm glad I didn't have British "Lucas" or Italian "Magneti Marelli"electrics to deal with, back then).

I've had many personal vehicles (25+) before, and worked on dozens more, and only had one unexpected failure (not wear items) with a German part, the Bosch K-Jetronic FI on my '73 Volvo 142. I really believe it was the Volvo tech that screwed it up, though.

And because I've had more GM vehicles than all other combined, I've become accustomed to AC-Delco/Delphi/GM parts go from being all made-in-the-USA, to coming from all over.

Anyway, here's what I received, and plan to install in a day or so; hope it works as a good German part should.

[workingonit]

Took the wife grocery shopping today. X5 drives great as usual, but the SES light popped up as I pulled out of the store lot: P0369 - Camshaft Position Sensor 'B' Circuit Intermittent Bank 1. I haven't pulled the freeze frame data yet.

i'm waiting until after New Year's for my wife to return to work, so I can install the new CPS to see if it fixes the P0365 & P0369 codes. Still waiting for a "no wind" day to smoke test, as well.

[workingonit]

Six weeks and maybe 150-175 miles since I had any codes pop-up, P0171+P0174+P0313 reappeared today. The cam sensor replacement made its' corresponding codes go away, but the upgraded DISA fix didn't permanently fix the assumed vacuum leak problems. I guess I'll have to smoke test after all.

I grabbed a Torque Pro freeze frame before I came inside, but I'll use the Foxwell tomorrow for perhaps a better picture. I was almost sure that the DISA was the solution, though.

[workingonit]

Finally used my home-built smoke tester, ran it for 20 minutes, and found no leaks. Inspected all the ducting (hoses) to the MAF, throttle body, and IAC; all were crack-free (they certainly were not 20 years old...I suspect that PO1 had replaced them prior to PO2 bought the X5, to restore for our car-swap).

I cleaned the MAF sensor, which looked OK, and it's a Siemens, not a knock-off; all clamps were tight before and after I took them off. IAC rattles OK, and I did an activation test with the Foxwell to confirm functionality (did the same with the SAP, though it never seems to run, usually). Cleared the codes and will wait for next time they appear.

[workingonit]

Originally Posted by fourtyres

Reading the following codes(all go away when cleared-come right back)
2002 x5 3.0

P0313 Misfire w/low fuel
p0300 Random multiple cyl. misfire
p1346 misfire during start cyl.3
p1353 misfire with fuelo cutoff on cyl.6
p1350 ignition control system
p1342 misfire during start cyl.1
p0171 fuel system too lean-bank 1
p0174 fuel system too rich-bank 2
po456-evap leak monitor-small leak detected
po0491
po049


Ses light on-I'm an amateur mechanic and have been able to fix everything so far without going to the stealership-any help with troubleshooting/fixing would be greatly appreciated.Love the car and this forum!

Like the OP, I've been an amateur mechanic as well (over 50 years of it), have vowed never to go to a dealer/stealer if I can avoid it (a dealer charged my wife over $500 just to recharge her Freon in her Fiero (in 2002), while I was out-of-town; and damaged other components doing so), and I have a growing? list of codes I'm trying to fix. https://xoutpost.com/bmw-sav-forums/...-codes-me.html

CODES encountered so far:
P0171 - fuel system too lean-bank 1
P0174 - fuel system too lean-bank 2
P0313 - misfire detected with low fuel
P0365 - camshaft Position Sensor 'B' Circuit Bank 1
P0369 - camshaft Position Sensor 'B' Circuit Intermittent Bank 1
P0505 - idle control system, idle speed not plausible


P0171 & P0174 keep popping back up (4 times), even after the DISA was upgraded with the GAS kit https://germanautosolutions.com/prod...sa-repair-kit/, and the intake smoke-tested for 20 minutes.

P0313 has appeared 3x, even after the same services done above. P0505 2x, after the same tests. I rattled the IAC, but didn't clean it, as I was out of carb cleaner.

P0365 & P0369 haven't come back after I relaced the exhaust cam position sensor, nor has P0505.

Since I used the parts cannon twice already, I guess that I should try a new IAC and fuel filter (or test my fuel pressure first?).

There have been no starting, driveability or idling problems whatsoever; the X5 idles smoothly in neutral, and in drive as well.

If I need to test fuel pressure, then what thread size is the Schrader fitting on the rail? There seems to be a question about which ones work, and ones that don't. And I guess I'll replace the rubber boots as well, even though I couldn't find any leaks.

[ahlem]

How much fuel is in the tank? I had similar codes and the solution was a 99 cent O ring in the siphon pump pickup. (Thanks Andrew Wynn) If you have less than 1/3 tank, that might be something to check out and look at the dash codes.

[workingonit]

Originally Posted by ahlem

How much fuel is in the tank? I had similar codes and the solution was a 99 cent O ring in the siphon pump pickup. (Thanks Andrew Wynn) If you have less than 1/3 tank, that might be something to check out and look at the dash codes.

Since I got my X5 in May, with a 1/4 tank in it, I've never let the tank go below 1/2 full. My first drive was to the gas station where I filled it with 93 octane. I've topped it up twice since then, in late October before the state inspection, and in December, to get some "winter gas" in it.

I've only put <400 miles on it since I got it; about 200 before the first codes appeared in early November, after the inspection, and the rest of the miles since then, along with repetitive codes. At no time did it get below 1/2 tank.

However, I have seen the SES light pop up just after I've made a hard right turn (3 times, at the same intersection where I have to avoid getting rear-ended), and once more when I made a hard left acceleration onto the freeway, avoiding an idiot that tried to enter in front of me from a side street. Is the fuel moving away from the siphon pump pickup?, or is something else in the tank associated with the codes?

The freeze frames I've recorded show info that corresponds with those incidents; I use Torque Pro full-time on my dash-mounted spare Android phone to monitor my fuel trims to see if anything goes haywire, but the trims stay pretty consistent, close to the reported freeze frame info. They're always a bit high, but I don't know what other X5's with M54 engines get for fuel trim readings.

[workingonit]

Originally Posted by workingonit

...I have seen the SES light pop up just after I've made a hard right turn..., and once more when I made a hard left acceleration onto the freeway.... Is the fuel moving away from the siphon pump pickup?, or is something else in the tank associated with the codes?

The freeze frames I've recorded show info that corresponds with those incidents;the (fuel) trims stay pretty consistent, close to the reported freeze frame info. They're always a bit high, but I don't know what other X5's with M54 engines get for fuel trim readings.

I've put another 100 miles on the X5, all short hops around town (my BC shows the average speed at 19.5mph, and fuel usage at 15.0mpg), so my conjecture above is mostly correct, that my P0171 & P0174 (and sometimes a P0313) codes occur at low-speeds/sharp turns/rapid deceleration.

The fuel trims are now quite consistent, with long-term on both banks (the same reading on both) at 11.72 (sometimes at 10.94), while the short term readings are now mostly in the negative 2-6 range (the bank 2 is closer to zero than the bank 1). From what I've been reading about fuel trims, mine aren't too bad (I've yet to see examples from another M54, though).

Today I tried the smoke tester again, with no smoke visible, as usual. I'm going to try spraying carb cleaner next, since I must not have good enough eyesight to detect the vacuum leak that way. My Torque Pro app will tell me if the idle speed changes, even if it's so slight my (bad) hearing can't detect.

At what point should I look into the fuel system, if I can't find a vacuum leak? The fuel filter is < 3 years old, and I can't smell any fuel leaks anywhere (not really a possibility?). I'm also going to take off all the intake boots and replace them over the nexy six months before inspection is due.

[workingonit]

Originally Posted by workingonit

...The fuel trims are now quite consistent, with long-term on both banks (the same reading on both) at 11.72 (sometimes at 10.94), while the short term readings are now mostly in the negative 2-6 range (the bank 2 is closer to zero than the bank 1). From what I've been reading about fuel trims, mine aren't too bad (I've yet to see examples from another M54, though)....

Set the three codes again this morning, but also observed momentary short-term fuel trims of plus 10.5 to plus 11.7 (falling back quickly to plus 2 to plus 6), while the long-term fuel trims remained at 11.72, as usual. This was on my Torque Pro app, which didn't record a freeze-frame; I haven't looked with either of my hand-held scanners, yet.

Once again, I have no comparison standard to measure against, because I've yet to find what fuel trims are normal for a M54 engine. What do you guys normally see with your 3.0i engines?