1985-1998 [Subscribe to Daily Digest] |
>> I am getting a little better than base boost. At least I think so. It's kind of hard to tell without an actual gauge, but it seems like a little more boost with the BPC connector disconnected.
That's really odd, as assuming you refer to a 2.3L engine you should get more boost with the BPC solenoid attached, or the same if the solenoid is bad, but not less. You really need to connect a boost guage to ascertain what's going on. It would also help to know what year-model car you own.
>> I disconnected the "W" hose and got more boost. I didn't push it hard enough to see if I could hit cut out. But it went into the orange where the needle never goes. I checked the resitance across the BPC terminals and it was 3 volts in both cases.
It's been years since I owned or worked on a 2.0L engine, which uses a different type of BPC solenoid, but the 2.3L cars should boost wildly with the lower hose removed, triggering the fuel-cutoff switch. According to the Saab parts book, the solenoid for all 2.3L engines (i.e., late-'90 to '98 9KT's) has the same part numbers, though I've seen some minor variations in different solenoids. Some have a restrictor in the bottom vacuum nipple and some do not, for example.
>> As near as I can tell there are no vacuum leaks. Cruise works and brake lights work appropriately.
Again, without a guage it is difficult to know if the vacuum level is normal or not.
>> The BPC does not buzz at all.
The solenoid will buzz, but it is almost inaudible on my present car ('95 Aero). On my '91 9KT I never was able to hear it. In any case, the engine should be off but ignition on--then put your ear right on the solenoid. Don't expect to hear anything with the engine running or standing five feet away.
>> I have not checked base boost since I don't have a real boost gauge, and I don't want to just start twirlling the wastegate rod.
No, leave the wastegate rod alone, or at least remember how many turns you made in case you want to return to square one. I found a cheap pressure guage at a local industrial-supply shop, and since I now have an on-board graduated gauge I have made it a practice to ship it around to people in need. You score a 10 on the "in-need" meter, so I can have the previous loanee ship it to you. There's no charge and I only ask that you put it in a safe place until the next person in need surfaces, then you can ship to him/her. That may take months, but I see no point in everyone shipping it back to me every time. Email me for details.
>> I have ordered the APC/DI manual, and the dealership tells me it's in. Anything to check before I tear into the manual. I don't have a known good BPC to experiment with.
Having a known good unit would be very helpful, as these things are sometimes hard to diagnose. The manual will give you specs like electrical values, etc., for checking the solenoid's operation.
posted by 68.11.251...
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