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So, I'm stupmed here on a 1989 Volvo 240 wagon.
It stopped running, though it didn't stop in the middle of driving. It just that the next time we went to use it wouldn't fire at all.
I checked a bunch of things, and can tell you pretty much what it's NOT.
there's spark- at least coming from the distributor cap, so unless all of a sudden all 4 spark plugs died at the same time, it's not that.
I've checked a bunch of the known trouble spots.
The fuel pump relay under the glove box is fine. I replaced with a known good one, and it didn't make a difference.
Also tried swapping the mass air flow unit with a known good one- (it was behaving funny a while ago- but even when that dies, it still would idle) - that' didn't make it run, so it' clearly wasn't that.
It's not the in line fuel pump fuse. We had problems with that too a while ago and I replaced all that, and I checked that- its ok.
When putting the ignition on I can't hear the fuel pump, but I have an 87 here that I'm using as a control in the experiment, and that one you can't hear it either.
I jumped the #4 and #6 terminals (ok I'm not sitting in front of the car now, I think those are the two- whatever ones you jump to make the fuel pump go) in the fuse box, to make the fuel pump work. Yep, I can hear it now. Still, even hard wiring that so it's on, it's not firing.
(oh by the way, if you put a little starting fluid in the intake manifold, it will fire a few times, but not catch)
I checked for fuel pressure. No, I did not go through the whole process of checking the fuel pressure- I don't want to mess up anything that's likely ok. Suffice to say when loosening the pipe going into the fuel rail, yeah, fuel shoots out on pressure, so I'm guessing it's not that.
I'm sorta at the point where what's left? is it the brain? Yeah, that's all connected just fine (wiggled all the connections). Sure, the brain looks fine, nice and shiny- not like it's getting wet or anything.
From what I can see it's got spark, it's got fuel, it's just not telling it to inject in the injectors at all. I don't think all 4 fuel injectors got clogged up at the same time. I'd expect it to run crappy first before doing to DOA.
So. suggestions? Like I said, I have an 87 (ok, maybe it's an 86) here I'm using for parts swapping/testing, but sadly the bosch brain isn't the same one. I don't want to have to get another brain and then find out that's not it either.
-Bricky
Oh, and I tried the thing to figure out the failure code, and either I accidentally wiped it or it told me nothing. I (thought) was following the proceedure in the Haynes manual pretty closely but maybe I wiped it. So that didn't really tell me anything.
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