The latest is that the motor will randomly run super rich at idle - down below 11.25. I don't know how much more below as that's where my O2 sensor stops reading, but below it nonetheless.
Figure it could be one of 3 things:
- vacuum leak
- stuck/sticking injector
- dying coil
I tried pulling logs but apparently my injector duty cycle isn't included? I don't know what I'm doing anymore, I'm bad at cars.
I'll be doing a smoke test on the vacuum lines / intake this weekend to see what I uncover and go from there. Since it's intermittent, it could be any of those three.
In June I'll be riding a motorcycle through the Swiss alps and spending a week in Austria - pretty excited for it, but it's taking all of my attention to plan and prep for. Doesn't help that it's crunch time at work.
Once I'm back, I'll be buying parts for a 6-speed swap - I figure the 3.90 JDM box with DCCD is a good fit. It seems straightforward enough, but I will need to cut a hole in the floorboard to fix one of the transmission mounts - the nut broke free and won't allow me to unthread the bolt. Nothing a plasma torch and a welder can't fix.
I have been doing some stuff though:
- power washed the garage floor
- fixed up my girlfriend's 2004 BMW 530i
- replaced my roommate's girlfriend's front pads, rotors and fluid. She's... super broke.
- replaced the mid pipe on the Subaru since the old one had a nasty leak
- bought and am now prepping some new seats to throw into the 135 (hello bolstering)
In typical BMW fashion, the seats are missing the harness for power, so I've had to buy a special harness from ECS to run a new 30amp circuit to them for movement and heating. And, of course, I need two so I can do the passenger seat. And, of course, one shipped in but the other is on back order till August 21st...
So FYI, I finally got my car back, and left a bunch of stuff at the old shop. Including the stock RS seats. See if you can get them.
On the rich issue at idle, check your fuel pressure regulator. If its a stock one, its probably bad. Hopefully its a removable 2-bolt one, and not the one thats integrated to the fuel rail.
Sure - I'll shoot them an email and see.
It is a stock FPR, and it's a 2 bolt guy, but I replaced it the same time I did the swap (<2 years ago). It's an OEM part, I wouldn't assume it'd crap out that quickly :-/
I smoked the intake and vacuum lines today as a test - not a single leak could be found. It's got to be an issue with fuel or spark.
I'm tempted to send out the ID 725s to Dr. Injector for a cleaning, they were used when I bought them (3 months used, supposedly). I'm also running some hodgepodge of coils off like 3 different motors, so I'm tempted to replace those too for peace of mind.
I'll be checking the plugs tomorrow to see if there's anything suspect, otherwise I'm pricing out all of the small things I've wanted to do but have been too lazy to do so, perhaps this is a good jumping off point.