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|3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.|
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Thanks. It is the Bentley manual. The injectors are new & have made the car run more smoothly. The plugs are all uniformly soaked, so whatever is going on isn't cylinder specific. It's something that affects the engine as a whole. I'll post what happens after I replace the sensors. Hopefully it's missing/surging/dying because of the hugely excessive fuel. Either the sensors, or the fuel pressure regulator (maybe pump). Cheapest options first!
Very good possibility. That occurred to me earlier that I haven't pulled that injector or the fuel line to it. I may just pull it loose & aim it into a bottle & crank the engine to see what it's doing (with some Gorilla tape over it's mounting hole on the manifold). I also just scrolled through the Bentley again & noticed a little control box above the glove box that is referred to as the idle speed regulation control unit. If it does anything beyond control the idle air valve, it may be something to look at. I'll unplug it & see if the IAC valve stops humming with the key on.
I thoroughly cleaned every ground connection to be sure that wasn't a contributing factor. It wasn't. Through various testing I've found that it isn't a spark related issue making the car stumble & occasionally die. Whatever this is, it's not the fuel pump as the engine will scream up the rpm range with WOT. I can rev it up high & it sounds fine as I lift off & let it run back down without any throttle input. It seems at idle or part throttle is where it stumbles. WTH? That would suggest TPS, but I've already replaced it. Either a bad/wrong part or bad wiring. Please be a bad part. More testing tomorrow. Anybody have anything else to add or suggest?
The engine stumbles the same whether the IAC is plugged in or not (higher RPM, but still stumbling). This would suggest that the problem that makes it miss & stumble isn't the IAC, right? With the idle rising with it unplugged, but still stumbling in the exact same fashion, I would think that the IAC isn't the culprit. Next? I'm about to decide to make somebody a package deal on all of the new components I installed + the engine & transmission for $500 total so I can just drop in one of the V-8's I'm seriously considering. It would seem that whatever ails this Bimmer isn't going to be easily found (it's probably a wiring or bad connection issue). I figure that these parts can help somebody else that doesn't have any wiring problems. This situation sucks because I actually like this little I4, despite it's lack of power. It could be rebuilt a little stronger & still maintain decent balance & MPG. But....if I'm going to continue spending copious amounts of time on this car, I'd rather not have these Bavarian electrical gremlins thwarting my every move. Replacing this setup with an easy to work on Ford 5.0 setup with 300+ HP/TQ is more tempting every time I find more frustration with this nightmare. Ruining the Bimmer's balance isn't appealing, but it can be remedied with a few W7's in the trunk! About 2-300 more pounds total, but accompanied by 200 more HP seems like an acceptable trade-off. What do you think?
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