Question about 1997 Saab 900
My saab when accelerating into the yellow, starts to bog or buck and not go any faster until i let off the gas and bring it back down to normal range. I first tried going to our local salvage yard where they have alot of saabs. Bought a new used wastegate and APC solenoid. Still has this problem. What is the possibility of those being bad also? Is there a definate way of telling exactly if it is the wastegate of apc solenoid? I can pull the wastegate actuator arm out by hand... please HELP!!!
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Posted on Jan 02, 2017
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There are several common cruise control failures on Saabs. The pedal switch failures are the most common problem. What generally occurs is that the pedal switches become mis-adjusted or the ears get broken off the switches causing a no contact condition. Another common problem is that the cruise vacuum hose leading from the vacuum pump under the false bulkhead begins to crack where the vacuum fitting is located at the firewall.. The third most common failure is an intermittent functioning cruise control module. This can often be identified by noting that the cruise will work intermittently (900 & 9000 only).
Another Issue: On turbo models, there is a vacuum controlled switch, located near the pump (red cap) that cuts the signal to the APC solenoid valve when the cruise control is on (switch opens). If the switch is faulty (I broke mine on rough road), it can keep turbo boost at the "basic" level even if the cruise is turned off. The APC boost gauge will only go half-way into the yellow region, and performance will suffer. Either replace the vacuum controlled switch or pull the pigtail connector below the switch and short the ends of the yellow/white wire going to the APC solenoid valve and
proper turbo boost should return. Be aware that if this second fix is employed, your turbo is not limited in boost when in cruise control.
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