new to me, 98 M3
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Open element filter will only cause grief with a MAF if its an oiled element like an ITG or K&N style filter, or if its a Spectre brand.
The oil can get whisked into the intake stream and coat the MAF element with a thin layer of oil which can damage it or cause bad readings.
Spectre brand filters are just horseshit and don't belong on anything nicer than a Cobalt.Remember to cap off the intake and exhaust. Plastic grocery bags work unless you only ever BYO canvas bag to Whole Foods because one time I saw a fish choking on a plastic bag and the Almond Milk at Pick N Save is low quality and don't get me started on Piggly Wiggly.
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Thanks Snap. Useful info for sure. I'll check the wiring again around everything. The car does have an open air cone filter. Would that effect the MAF readings as an "air leak"?
Both upstream O2 sensors are brand new Bosch so I think those are OK. Going to grab some injector cleaner and see if that helps.
I'm going to try rigging up a DIY smoke test this afternoon.
The filter should not affect the reading of the MAF. Unless it sheds oil.
Could the wiring have gotten switched and the o2 sensors are adjusting the wrong bank? I am not sure if there is only one fuel trim value or one for each bank so this might be bogus but it seems odd that one is low and one is high if they are both new.
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Been looking for a TS for a while, wanted to get one for my s50b32 once I figure out how to get it running, good find.
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I feel sick after looking at those pictures long enough...
I'm with Brian on this one as your flow rate is very low, and I don't know if you were on the throttle to keep it alive or if that is a bad reading.Do you have the air filter directly attached to the maf? I have head that doing that can eliminate the laminar flow that is usually maintained the stock intake. Would it be enough to cause that low of a reading? Not sure.
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Thanks. Yeah I did a bunch of research on that SC before getting the car. It's pretty highly regarded on the bimmerforums forced induction page. Made me feel more comfortable about buying someone else's mods. The SC only has about 20k miles on it. It is due for an oil change before I really start driving it. Its definitely a different type of feeling compared to the turbo 135i, In a good way, very linear power.
what, you mean you don't like the instant, always-on blast of torque trying to kill you in the 135 ?!?!?! Say it isn't so
Seriously, my 1er tried to kill me a lot.
Glad to hear you are close enough to Lake Mills to make it out to some C&C this year. The C&C there is actually how most of us who are normally too busy to connect get an excuse to meet up and hang out for a few hours. I also really enjoy it
2011 E92 M3 6MT ZCP - ESS 625 supercharged
2007 Z4MR
2003 E39 M5
2002 E46 M3
2021 X5 40i -
2011 E92 M3 6MT ZCP - ESS 625 supercharged
2007 Z4MR
2003 E39 M5
2002 E46 M3
2021 X5 40i -
I know you said you JB welded that boot really well but do yourself a favor and replace the boot if it's been torn at all. This may or may not be your issue but the boot is already weak if it's torn where you could see it.
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****PROBLEM MAF is showing a flowrate of 0.01 lb/sec. my math says that 0.15 lb/min should be roughly 2hp. At idle your engine should be creating at least 15-20hp. So your MAF is borked, your wiring has an issue, or there is a SEVERE air leak somewhere.
Throttle Position is at 17% which tells me that you have to keep your foot on the throttle a bit at idle to keep it alive because of the presumed MAF problem.
At idle with my foot off the gas my '99 M3 sits at 17%/18% throttle. Not sure on the rest of the numbers though. When I get back from my trip I can see what my car reads for the rest of the parameters you posted to compare
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hi all, back from the weekend. Update. Hooked up a DIY smoker. Paint can with some tubes hooked up to a compressor at 4 psi then blew smoke into the chamber. Worked well except I couldn't introduce enough smoke with just a cigar. Didn't really need the smoke I was able to hear one small leak out of one of the SC tubes. Fixed that and checked again couldnt hear any air leaking out of anywhere else and pressure definitely built up. Intake tube fix held fine. Drove car again and light still came on, this time only code P1188.
Filter is a K&N that probably needs to be cleaned and lightly oiled again. But not sure that would be my problem. Next step is to check injectors I suppose. I put some injector cleaner in the tank. Also tried to clean MAF. For the O2 sensors I only unplugged 1 at a time so I know I put those back in the correct spots.
Car still seems to run just fine, drove it about 250 round trip up north. who knows on this one! Kind of stumped at this point.
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Did a little more testing on the code reader. For my MAF reading i watched it while driving home. At 55 mph it would hover between .04-.05 lb/s Not sure if that's normal or low. Under reasonably heavy acceleration it'd get to .11 lb/s. So, it appears to at least be reading something. I unplugged it at idle and the car started to spit and sputter badly, so it's regulating a little bit I assume. Would software for the SC mess with this? No one on here around Madison I could swing by to test a known good MAF before dropping a couple hundred on one? I'll also be around brookfield this Friday about 2pm and heading back to Madison
I tried the screw driver on the injector trick to see if they're ticking properly. Couldn't really hear crap over regular engine noise. You'd think they'd be OK since they're only 20K miles old when the SC was put on. Haven't flow tested them yet. I suppose that's next.
Happy to entertain other ideas! New fuel filter comes Friday as well, maybe its not getting the fuel it needs?
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What's the part number on your maf, I might have one.
Real OEM is saying
but I'll double check what's actually on mine since the SC kit supposedly came with a new one.
Another note, I see my reading is .01 lb/s. I'm looking online for normal readings and see readings are all recorded in lb/hr. Not sure if that makes my reading OK.
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thanks for pointing that out, lb/min is the most frequently used unit for engine airflow (besides CFM) and I totally overlooked the fact that your scanner outputs lb/sec. .05 lb/sec is roughly 30hp which is reasonable for cruising. "reasonably heavy acceleration" at .11 lb/sec is only 60hp which is only considered reasonably heavy acceleration in an air-cooled beetle.
if you can get a WOT reading and give an approximate RPM during the reading we can get a better gauge as to whether the MAF reading is reasonably or not. So far it appears reasonable at low throttle openings but not heavy acceleration.
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thanks SNAP, i'll do that today!
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OK, took out for lunch. A bit hard to read while driving and going to WOT but I noticed it as high as 24.1 lb/s. If I had to guess my rpm around 4500-5000 range at that point. Again hard to drive and not crash while watching three things. So, it may have peaked higher I just didn't catch it. I also took some revised data while cruising at 55 mph. Not sure if that tells anymore of a story.
One other little thing I've noticed. When I come off throttle and into neutral from stop and go traffic the rpm will dip very briefly to about 400 rpm and recover immediately to normal idle. Only does this in stop/go. Doesn't do it if I come into neutral from higher gears like 4 and 5 and drop into neutral.
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24.1 lb/sec is an absurd value which equates to 14,500 HP
24.1 lb/min is a very realistic value which equates to 240 HP
You should be seeing 0.35-0.40 lb/sec at WOT for that rpm.
rpm dip upon return to idle means the engine isn't idling efficiently. Most of the time this means a vacuum leak. Sometimes it means check your idle control valve, clean it and inspect the plumbing on it and make sure it works.
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Yeah, my car is really fast!
sorry meant .24 I'll take a passenger with me who can watch more closely to see if it gets up towards .35I'll keep searching for vac leaks. Going to have get it up on ramps. Because of the SC the ICV is located under the SC and very hard to get at. I was hoping in the back of my mind i wouldn't have to deal with that, but am realizing I'm probably going to need to inspect it. Not sure how i'm going to get at it. ugh......
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Ok, finally got some time to pull a bunch of numbers from my car. It was not fully warmed up, but idling around 750rpm.
Absolute throttle position: 18.8%
Voltage: 14.00
B1S1 O2 voltage: 0.125 (bounced between this and 0.950, probably an issue with my reader)
B1S2 O2 voltage: 0.960
B2S1 O2 voltage: 0.115 (bounced between this and 0.950, probably an issue with my reader)
B2S2 O2 voltage: 0.940
Short term fuel trim 1: Between -2.4 and 0.8
Long term fuel trim 1: 2.34
Short term fuel trim 2: Between -.8 and 2.4
Long term fuel trim 2: 1.56
Timing advance: between 15 and 17.5
Mass airflow 1 (g/s): Between 3.57 and 3.85
Mass airflow 2 (g/s): Between 3.43 and 4.9 (4.9 was just after startup, rpm's not fully settled)
Hopefully this helps!
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Thanks M42B32. I've discovered I have the 803 Porsche MAF because of the supercharger and upgraded injectors. So, not sure my numbers will give much of a comparison. I'd say the MAF appears to be functioning though. That would have also been new at the time of SC install.
I haven't had a chance to drive much since this weekend. Summer tires on the M and snow don't mix. Hopefully tomorrow I'll be able to get it out of the subdivision. Spent the weekend tearing down to the ICV. Cleaned that real well, it was pretty dirty. Put everything back together real tight, added hose clamps to vacuum lines that didn't have any just to be safe. Not hearing any leaks. Cleaned the air filter. It was filthy. Still getting crap out of it after using the K&N cleaner three times. Cleared codes and only took for a couple short trips. Pending codes didn't come back. Not holding my breath though, codes seemed to appear when I'd get to highway speeds, which I didn't do yet. Tomorrow should be a good test.
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