whoa! that is a serious e30 and a legitimate 320is!
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Lira (euro DS mtech II 318is reshelled, 24v swapped, also now BAR'd)
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a pressure washer'll do that for ya ;)
also, something is wrong with my M50. This is copy pasted from my thread in the 24v subforum in the hopes that maybe someone will see it.
the symptoms
once car is hot, idling for less than a minute will lead to it violently stumbling once, throwing the 1221 O2 sensor code and having a rougher idle thereafter.
No code is thrown during driving.
Power feels normal until code is thrown, there is no misfire or hesitation.
The idle is normal until code is thrown.
things I've tried with no effect
replaced oxygen sensor with a new one
replaced MAF with a different used one
replaced ICV with a cleaned, working one
replaced injectors with known-good ones
replaced coils with known-good ones
replaced spark plugs with new ones
replaced fuel filter with a new one
replaced TPS with a known good one
checked manifold vacuum; -20inhg (in spec)
leakdown test; 0% 0% 3% 1% 0% 0%
smoke test; no leaks
reset ECU; no change
replaced ECU with stock-tune 413; no change
remaining diagnostics
meter out the TPS
meter out the MAF
monitor fuel line pressure
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Sounds like your issue is when it goes into closed loop. 3.2 bar is a little low for the M50tu. It should be closer to 3.5bar, doesn't sound like much but the slightest fuel pressure drop when in closed loop can cause a lean misfire. Are you still using the M42 fuel pump? Once the code is thrown and the idle becomes rough, how does it run under a load/higher RPM? could have something to do with EGR if you still have it, or CCV, PCV?
I may be wrong but its something to consider. just my .02 cents.
awesome build BTW . I wish I could get some headway on my E30 (11 years in the making project).Last edited by TrixE30; 10-27-2015, 09:17 PM.
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Originally posted by Javier h View PostI saw this on craigs and thought of your car somewhat. An Mtech2 with an M3 engine.
Originally posted by TrixE30 View PostSounds like your issue is when it goes into closed loop. 3.2 bar is a little low for the M50tu. It should be closer to 3.5bar, doesn't sound like much but the slightest fuel pressure drop when in closed loop can cause a lean misfire. Are you still using the M42 fuel pump? Once the code is thrown and the idle becomes rough, how does it run under a load/higher RPM? could have something to do with EGR if you still have it, or CCV, PCV?
I may be wrong but its something to consider. just my .02 cents.
awesome build BTW . I wish I could get some headway on my E30 (11 years in the making project).
51psi should be with the vacuum line of the FPR unplugged.
it's definitely triggered by something that runs in closed loop if the car runs well before operating temp
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also I guess I missed an update cause i've been busy with the darn CEL
the car is back from the exhaust shop and, well, good news and bad news on that front
the following things happened
- the front flanges and x pipe got cut off a stock e36 325is downpipe
- pipes were run from the flanges placing the x-pipe in a stockish location
- two Walker 80801 CA cats were welded in post-x-pipe
- a stock e36 M3 muffler had its nice pipes and flanges cut off and new pipe run directly to the cats
good news is that it was all run really high up and form-fitting to the body, so I have a ton of clearance
bad news is it's a bit of a hatchet job. the work is well done, but not really.. right.
the ehxaust tips will be extended, waiting for them to be delivered
eventually (when I do the suspension), I'm taking the exhaust down, grinding down the welds and welding in a flange post-cat so that I don't need to take the whole thing out in one giant-ass piece every time I want to fiddle with stuff behind it.
the plan was to BAR it and then do the suspension refresh and sideskirt repair, but my new appointment isn't for a while.
Originally posted by TrixE30 View PostSounds like your issue is when it goes into closed loop. 3.2 bar is a little low for the M50tu. It should be closer to 3.5bar, doesn't sound like much but the slightest fuel pressure drop when in closed loop can cause a lean misfire. Are you still using the M42 fuel pump? Once the code is thrown and the idle becomes rough, how does it run under a load/higher RPM? could have something to do with EGR if you still have it, or CCV, PCV?
I may be wrong but its something to consider. just my .02 cents.
awesome build BTW . I wish I could get some headway on my E30 (11 years in the making project).
I think it runs fine in closed-loop until it has to sit around and idle while hot. it'll run for a while when cold, as well, just eventually hits some amount of cold idle and trips over its own shoelaces
I'm still using the m42 pump, yup. I haven't volume tested it but car doesn't seem to have a miss at WOT at all.
I haven't run it with the CEL on, that test is scheduled for tomorrow.
the CCV/PCV is new and seems to be functioning normally. the purge valve is present and hooked up as well, but I haven't tested it for function yet.
also I've been giving it the beans while testing, and the M50 has a totally pleasant amount of power. I see why you people do this now :evil:Last edited by kronus; 10-28-2015, 12:18 AM.
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I've metered out the TPS, CPS, CTS, ATS, MAF and O2 sensor and everything is nominal. still chasing this stupid thing.
edit:
CPS: 528 ohms
TPS: 1450 ohms to 4790 ohms, full sweep is fine
ATS: 2340 ohms at ambient temp
CTS: 1990 ohms at ambient temp
MAF: .8V at idle, ground ok
O2: 2500 ohms heater resistance, continuity to DME ok
beating my head on it: yesLast edited by kronus; 10-30-2015, 11:49 AM.
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went to a shop with an autologic unit; either there's a O2 sensor wiring fault, or both MAFs I've been testing with are bad. Car wants to run lean.
also got the sides done. first, template
then drill (I started with a 3/8" bit and then used a step bit to enlarge to 5/8")
then mount
then get the pods on
then drive out into the daylight and admire
I also got the 80/88 fan switch in, but it's not engaging the low speed, so my fan resistor is likely trashed.
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