Enhancement Brake
Saab 900 rough idle in D?
Here's the car: 1995 Saab 900S automatic 2.3L non-turbo 4cyl 130,000 miles
On starting, car idles very rough when car is in drive and foot on brake, low speeds (5MPH and lower) are also rough - car shakes somewhat. Idling gets better as car warms up. Also not so bad when car is in Neutral or Park.
I'm used to driving stick shift cars, so I'm not sure if a little vibration is normal in an automatic.
Not that it's related, but the SID (display) sometimes acts a little freaky (in addition to the dreaded missing pixels)
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While I'm at it here, any ideas on performance enhancement options for a car of this age. I love driving the car, but would like a little more "umph" in the acceleration. Cornering is already great.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), They get full of gunk over the miles and cause idle issues (stalls, low idle) like yours,
Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, Remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Edit - the only performance enhancement option I know of you can do that will not cost a fortune is improving the airflow to the engine. You can split the exhuast into two tailpipes and mufflers with a shop that knows what is doing by splitting the pipe from the engine manifold, and with better breathing get a slight performance boost of 10 to 15 horsepower.
Unfortunately, turbo charging is not an option from what I know of the older Saab engines since reinforcement is needed which you will not want to pay for.
Not sure what you mean the display acts freaky. Under what condtions?
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