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I thought BMW guys didn't use Megasquirt because of some weird compatibility issue? (can't remember what it was)
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Jan 2, 2014 18:15
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McMadCow posted:I'll take this one since it's my ride. The issue is twofold and we're 99% sure they're related. This might be a dumb question, but did you check the idle control valve?
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Jan 2, 2014 18:18
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Lightbulb Out posted:This might be a dumb question, but did you check the idle control valve? Yes, sorry about that, forgot to mention. We replaced that as well with a junkyard one. So unless it was an identical fault on both pieces, it's not the cause. Also, would the ICV be related to the WOT with any pedal travel?
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Jan 2, 2014 19:50
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Is there a throttle position sensor on those?
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Jan 2, 2014 19:53
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It's called a switch on that model, but yes. And it's been replaced- factory new one in there and no improvement.
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Jan 2, 2014 19:54
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Have you gotten your can of propane out and gone hunting for vacuum leaks? Also are BMW FI systems dependent in any way on coolant temperature? Perhaps a sensor is bad?
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Jan 2, 2014 20:35
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revmoo posted:I thought BMW guys didn't use Megasquirt because of some weird compatibility issue? (can't remember what it was) Where in the world did you hear that nonsense? They even sell plug-n-play Megasquirts that comes pre-mapped and wired for several models of 325/535/M5/other 80's-early 90's BMWs. http://www.diyautotune.com/catalog/megasquirtpnp-c-40.html They're likely just not that common since BMW DMEs are easy to reflash with new tunes on the later models, negating the need for an aftermarket ECU most of the time.
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Jan 2, 2014 20:38
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Panaflex posted:Have you gotten your can of propane out and gone hunting for vacuum leaks? Also are BMW FI systems dependent in any way on coolant temperature? Perhaps a sensor is bad? Both good questions that James Woods can answer better than I can right now because I'm stuck overseas for the past year+.
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Jan 2, 2014 20:51
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McMadCow posted:Both good questions that James Woods can answer better than I can right now because I'm stuck overseas for the past year+. Have you tried a known-good ecu/dme?
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Jan 2, 2014 21:06
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Saga posted:Have you tried a known-good ecu/dme? Tried two different M42 ECUs with the same result. Also did both with and without the Turner chip that's in there.
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Jan 2, 2014 21:16
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Do those cars have an actual WOT sensor? I think they might - it could be faulty and sending a weird fuel map.
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Jan 3, 2014 04:55
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VelociBacon posted:Do those cars have an actual WOT sensor? I think they might - it could be faulty and sending a weird fuel map. I believe the TPS has three states - idle, WOT, and somewhere in between. If so, he's changed that already.
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Jan 3, 2014 04:56
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Just went through a similar fiasco with the girlfriend's M42'd E36. It would be a paint to start cold, idle like crap or rev to 2000 - 3000 rpm. When driving it would surge, and accelerate by itself from a steady throttle position. We picked up a low KM ICV, cleaned the hell out of it and installed it. At the same time we replaced the PCV hose and cleaned the breather. So far so good - starts well and behaves when driving.
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Jan 3, 2014 05:44
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It almost sounds like a corroded/flaky wiring harness but here's hoping it isn't.
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Jan 3, 2014 06:11
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Hondas in the 80's had terrible beak booster problems that would cause idle surging.
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Jan 3, 2014 06:17
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Sounds more like a vacuum leak to me.
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Jan 3, 2014 07:40
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jamal posted:Sounds more like a vacuum leak to me. Sadly no. We not only did a vacuum leak test with starter fluid but a month ago I also replaced every vacuum hose on the drat thing. My money is still on the MAF which I will be purchasing new shortly. Meanwhile..... There comes a time where you must walk a path and there comes a time where you must open a door. Change is abound and has invaded my life in more ways than one. Not in the least of which that the consignment shop I work for is moving locations to a new airplane hangar sized facility that we hope to pack to the gills with more of these exotic monstrosities. This means Don and I are up to our elbows in poo poo as we tend to what we've dubbed our problem children. This is a gnarly bunch of cars that have been giving us trouble and won't move under their own power or are otherwise unsafe to drive on public roads. You see, since the move is just a few miles down the expressway the boss doesn't want to waste money flatbedding everything over to the new shop. This means we have to drive as many of these fuckers as possible over to the new facility over the next two days.   Don got stuck down in LA for a couple days so I'm here tending over the kids, namely a 1956 Bentley S1 and a 1997 Benteley Azure.  The big job ahead of me is the Azure which needs new pads and rotors all around before it can drive over. Yes a simple brake job on a British luxury car, how hard could that be?  Well what the gently caress is this poo poo? Two goddamned calipers per front wheel? Each one is a single piston with a pad surface area less than half of what you'd get on a Vette or 911 or even a loving Chevy Silverado these days. Why? I utter this phrase constantly while underneath these English cocksuckers. I swear to God the men who designed these cars must have been molested by a mechanic at an early age because they build these things as if their number one objective was to hamper it's serviceability.   I've gotten to the point that it doesn't even phase me to find out that you have to completely remove the hub assembly to replace a simple wear item like the rotors nor does it surprise me that they're attached to the hub by seventeen pounds of fasteners where most manufacturers use a single hex screw or nothing at all for the same job.  Good gently caress gentlemen, if you lads could build a caliper worth a drat you wouldn't need a rotor that weighed seventy five pounds. Lets have a look at the back.  Hey, that almost looks like a proper brake caliper. Too bad that hub assembly you see in front of the rotor isn't a hub assembly at all but rather part of the brake rotor itself. That and it's held on by the same bolts used on the prop shaft on the QE2.  This picture is of the back of the caliper and shows three of the five hard brake lines that go into each rear caliper. Yes I know WHY? This is backed up by a mechanical linkage to the parking brake in case you're thinking that all that plumbing was there for that reason.  Why does a two door convertible need such an overly elaborate brake system anyway?  Oh. That's why.  These official Bentley stainless steel cotter pins were hand made by the original Cotter family of Chester England. They cost $95 a piece.   After much bending, flaring, swearing and crying the Azure is back on it's feet next to another problem child waiting for some LMF-11 Mineral Oil, a substance I've come to find is scarcer than Kryptonite. Now on to the real doozy the S1  It's not turning over so I begin a series of electrical tests that conclude nothing other than that I have a high tolerance for electrical shock. I'm reminded the hard way that this car is wired in reverse polarity with a shower of sparks and a $10 fuse burnt in my FLUKE. I make note of my error and am then greeted with more sparks and smoke when I find that certain aftermarket add-ons like the electric fuel pump are wired in straight polarity. The car then fries my dick off as the deaf as poo poo 65 year old HA sales manager decides to crank the engine while I'm resetting the ignition wire after a spark test.   After all my fiddling with this contraption Don turns up and shows me the correct procedure on how to manually prime the carburetors which springs the thing to life like a shot of adrenaline to the heart. That hillbilly has more than a few tricks up his sleeve.  This inspired us to take the S1 on a test drive in the neighborhood to see how it would fare on the trip to the new shop. Driving this thing is less like driving a car a more like operating a nineteenth century locomotive.  The dash is festooned with esoteric knobs and switches most of which aren't labeled in the slightest. Despite this it is an absolute pleasure to drive in or more to the point be driven in. It's like being driven around in a well appointed den rather than being in a car.  The bartender at the local watering hole we get lunch at liked the car very much and insisted being photographed in it. With our flock attended to and ready to embark on our journey we call it a night and get some much needed rest. The next day we begin driving entire fleet over to the new facility and we will need all the wits and testicular fortitude we can muster.
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Jan 3, 2014 09:28
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Jesus. I would get irritated about stuff like changing a clutch on an s2k, a turbo on an evo x, or downpipes on a gtr, but that is a whole new level of bullshit. Although there are a surprising number of cars with the hubs outside of the rotor. Some hondas and mazdas off the top of my head.James Woods posted:Sadly no. We not only did a vacuum leak test with starter fluid but a month ago I also replaced every vacuum hose on the drat thing. My money is still on the MAF which I will be purchasing new shortly What happens if you unplug the maf? The subarus I'm used to dealing with will idle well without one. On second thought that probably won't solve anything. jamal fucked around with this message at 09:42 on Jan 3, 2014 |
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Jan 3, 2014 09:36
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NEEDS MORE BREAKS
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Jan 3, 2014 09:36
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Now poo poo's getting exciting.
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Jan 3, 2014 09:38
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Another fantastic update. Good on Bentley for remembering how important it is to properly balance the weight of the calipers around the axle on the fronts...jamal posted:Although there are a surprising number of cars with the hubs outside of the rotor. Some hondas and mazdas off the top of my head. My 96 pathfinder had this as well. e: Oh gently caress I can't unsee goatse in that brake caliper(s) picture
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Jan 3, 2014 10:21
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quote:It's not turning over so I begin a series of electrical tests I gasped out loud, for reals. Nightmare fuel. 50's Bentley Electrical Work sounds like a death metal band name.
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Jan 3, 2014 13:36
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Jan 3, 2014 14:03
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$95 cotter pins on a '97, I will never complain about BMW and Mercedes dealer-loving prices again.
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Jan 3, 2014 16:59
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Seat Safety Switch posted:$95 cotter pins on a '97, I will never complain about BMW and Mercedes dealer-loving prices again. Do $95 cotter pins at least come in a package that contains a handwritten note describing the ancestry and childhood of the guy who made them?
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Jan 3, 2014 17:09
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Motronic posted:This is sage advice from someone who has apparently also been on the wrong end of this one.  Yes, I have. Also hub-captured rotors are a thing, 96-97 Accords and pre-BG Mazda Familias are ones I've worked on. They're not totally uncommon on older cars, it allowed for opposing piston calipers without non-standard wheel offsets, but I've never seen that reasoning actually used.
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Jan 3, 2014 17:10
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Now we know who this was really aimed at. I mean holy gently caress, two single piston calipers? A rear rotor setup that would look more at home on a one-ton truck (and yes I realize that's kinda what this thing is but still)
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Jan 3, 2014 17:18
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RR/Bentley also wrapped the harnesses in tubes.... which would chafe! The positive earth slip up was a good laugh though.
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Jan 3, 2014 17:24
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This thread.  I'm going to stop complaining about hard to find or needlessly expensive parts for my car now.
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Jan 3, 2014 17:26
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Yeah I get pissy when I have to work on ford products instead of subaru stuff sometimes  This thread is terrifying.
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Jan 4, 2014 00:52
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VelociBacon posted:Is that the same model that Clarkson had on the track (with a couple failures)? I had no idea it was actually as fast as Ford is saying. Tesla black box data showed that Top Gear/Clarkson deliberately lied about the poor battery life Other accusations such as the fact that it uses tree hugger tires are incontrovertible shortfalls but most of that "review" was anti-America fluff.
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Jan 4, 2014 01:12
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Slow is Fast posted:This thread is terrifying. This thread is magical. I don't know what you're taking about.
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Jan 4, 2014 01:42
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Moxie Omen posted:The answer to any and all 1980's/90's BMW fuel injection problems is Megasquirt. DJ Commie posted:Never, ever, ever modify a not working fuel injection system. You'll end up with the same thing, now even more broken. Its better to fix it first, then modify it, otherwise you're chasing demons you may have made worse. jamal posted:Sounds more like a vacuum leak to me. HotCanadianChick posted:I can't imagine hiring a fabricator to custom machine replacement parts is any more expensive than buying factory Ferrari parts, so I doubt it matters that much...
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Jan 4, 2014 05:02
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Why would a bolt from those days not be made on a cam/hydraulic screw machine?
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Jan 4, 2014 06:08
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British cars are notoriously "gently caress you peasant" for wrenching. But when they are not busy melting down, they are magnificent machines to drive. Edit: drat you auto correct! BrokenKnucklez fucked around with this message at 16:40 on Jan 4, 2014 |
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Jan 4, 2014 07:14
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Please tell me that you tested the original bolts, or got hold of the factory spec/drawing. If it's a critical bolt like for a head or a bearing cap, what it looks like is a lot less important than how it performs.
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Jan 4, 2014 10:14
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BrokenKnucklez posted:British cars are notoriously "gently caress you pheasant" for wrenching. But when they are not busy melting down, they are magnificent machines to drive. They run over a lot of birds? 
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Jan 4, 2014 13:43
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I had an issue very similar to your surging issue on an older car of mine, an 87 Escort (please don't laugh). What ended up being the issue was a wire that had broken inside it's insulation. When the car was warmed up, the hear caused the wire to separate, making the engine surge and eventually stop all together. This occurred within the firewall pass-through. I don't know if this helps, but I thought another experience might be of use to you. If you shoot your wires, get them warm first and don't be afraid to jiggle.
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Jan 4, 2014 16:01
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rear end in a top hat casserole posted:They run over a lot of birds? auto correct.
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Jan 4, 2014 16:41
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No-one kills pheasants with their nice car. Everyone knows you need a beater.
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Jan 4, 2014 19:33
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