Date: Sun, 5 Dec 1999 09:27:14 -0700 From: "Christopher A. Nowell" <c_a_nowellnopsamail.com> Subject: Re: Fuel injection 86 900
Benton, I had a similar problem with my 87 900. One mechanic I went to thought it was probably the relay itself, but wasn't quite sure. He took the relay out and put a wire in its place (horizontally, I believe, but it only works one way). When the wire is in the place of the fuel pump relay, you will hear the fuel pump working. It will never stop. But the car starts and runs wonderfully. It is quite a hassle to have to open and close the hood in our frigid Canadian temperatures each time I wasn't to start and stop. This also increases the possibility for explosion in the case of an accident. Anyhow, I brought my Saab to a Saab repair shop 600 km north of the other one, and he determined that it was simply a corroded fuse! The fuel pump fuse was corroded. By shorting the relay socket, I also missed the fuse, so the car ran fine without either. The corrosion on the fuse somehow wasn't complete, and depending on bumps, humidity and pressure didn't always affect my car. Paid $0.25 for a new fuse, and now my car runs beautifully. The corrosion isn't "rust colour." Just look for any non-shiny fuses. Hope this helps, -Chris Benton Quest <campjohnnopsamhio.net> wrote in message news:4Dj24.1165$2G4.18198nopsam... > SYMPTOMS: This is a really weird problem that this car has had for 2 years. > Originally the engine just died. I just pulled over and waited a bit and it > would restart. After checking the fuel pump and finding it okay, I > determined that for some reason, the fuel pump relay was getting a command > to turn off. > The first start in a cold morning is fine, and sometimes the car will > run great for days, but sooner or later, it will have a "spell". A spell is > how I describe the condition this car gets sometimes, which seems to be a > very lean mode, as if the fuel pressure regulator is being told by the car's > "brain" to reduce fuel pressure. The car will go in to or out of a spell > very quickly, in the blink of an eye, and sometimes a spell will stop at the > same time the tach starts working again. > The tach is another mysterious factor in this condition. One minute the > tach works, another minute it is dead. Sometimes the tach turns on and off > with the turn signal, but usually not. If the car is having a spell, the > tach is always dead, but if the car is running fine, the tach may or may not > be working. > There is nothing that causes a spell for sure, and nothing that cures > one. The car seems to have a mind of its own. You can be cruising the > freeway with the car running fine, and then you exit and stop and the car > stalls. Sometimes revving the engine a little brings the car out of a spell, > but usually not. > If you are on the freeway with the engine up to operating temp and the > car has a spell, you can keep cruising, just shift down to 4th gear and > floor it, you can at least stay above 50 mph. But if the car has been > sitting for a while and is nearly cold, and you start it and it has a spell. > You will hear some back firing in the intake manifold. It might snap out of > the spell, but if not, you will have to rev it hard to get enough power to > move, and then only very slowly! > You will get some dirty looks from other drivers as you go thru the > intersection like you are running on one piston! HOWEVER, just floor the gas > until the revs get high enough, and you feel a burst of power, then shift up > and floor it again until that high rpm burst of power comes back. The brain > seems to give some fuel pressure at high rpms even during a spell. Revving > it may break the spell, and if so, then it goes back to normal power. > I suspect it could be either the brain box, the ignition pulse amp, the > amp, the regulator, or a ground somewhere. > Anyone else had this problem? > > >
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