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Old 06-25-2002, 08:26 PM   #1
93sl1
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Question SL1 Hesitation when engine warm with AC on

I have a 93 SL1, about 76K miles. I continue to have lots of hesitation after the car has warmed up and when the AC is on. There is no hesitation when the car is cold and the AC is on. It only starts after a few minutes after the engine has warmed a bit. Does this indicate a bad sensor? Can the engine programming be changed to correct this? Is there a switch I can install that will shut the AC off while I am accelerating to get around the problem?
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Old 06-26-2002, 03:34 PM   #2
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A dying Engine Coolant Tempurature Sensor COULD be the cause of your problem. It's a relatively easy part to replace and cheap too.... It's a 2 WIRE sensor located on the drivers side of the engine just under the point where the uper radiator hose attaches to the head. I would recommend cleaning the throttle body's butterfly and throat as well if not done recently and running a quality fuel injector cleaner through the tank BEFORE replacing the sensor. As if your injectors are a liitle clogged or your throttle butterfly a little gunked up it could be the actual root of your problem.

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Old 06-26-2002, 04:38 PM   #3
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'93 Saturn motor has 2 Coolant sensors for both Temp Gauge and car computer. They are not hard to replace like you said, but I doubt if this is really the culprit.

93sl1, what's your Coolant needle reading during your drive with AC on? If it's near on the Cold side (Away from Mid-point, near 1/4 mark) even after long driving you may have a bad thermostats.

Also, are you driving an Automatic? You got to realize '93 SL1 motor only produce 85HP, with AC on and Auto tranny you won't expect to have lots of oooomphs from this powertrain. Esp during HOT days with air temp rising, you motor is less efficient to convert gasoline into HPs too. That's why performance people are looking for ways to route lot of COLD air through the intake near ground instead......

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Old 06-26-2002, 05:25 PM   #4
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Default Re: SL1 Hesitation when engine warm with AC on

Quote:
Originally posted by 93sl1
Is there a switch I can install that will shut the AC off while I am accelerating to get around the problem?
Thanks
When you depress the gas pedal almost all the way (about 90% I estimate, someone else knows the exact #), the compressor automatically shuts down for a few seconds to give you the extra boost you need. With the temps around here in southern CA I use the AC a *lot* and find myself flooring it anytime I'm heading onto the freeway, especially if the onramp is on an upgrade. If you don't want to stomp the pedal so much, you can get into the habit of clicking both AC and recirc buttons so the air you have cooled already stays longer in the system, then just pop that ac button back on when you're at cruising speed.

I normally keep the recirculate button off unless I'm behind an oil-burner or diesel to keep fresh air coming in.

Pete

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Old 06-26-2002, 10:27 PM   #5
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Thanks for the info.
The car has a manual transmission. Over the past year I have replaced plugs, wires, oxygen sensor, EGR, and most recently the alternator (it died). I considered changing the MAP and coolant sensors but have not done it yet. The coolant needle stays at about midpoint with the AC on. I did not realize that the AC would shut off if the pedal is pressed down far enough. I have been turning the AC off and on with the AC switch when I need to accelerate quickly.
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Old 06-27-2002, 12:29 AM   #6
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I drove several TBI equipped SL1s today (85 hp.. for those that don't know that the TBI injected model is the 85 horse one.) and noticed that ALL of them were slow to rev with the air on- like it was really straining the enigne. However, it seems that the newer 100 HP models don't strain nealry as much, and are still quick to rev with the A/C on.
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Old 06-27-2002, 09:49 AM   #7
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That's right. The AC on my lovely 94 SL is straining the motor whenever switch on, so I know the feeling. Is it because of the older compressor design or better compressor clutch?

I realize later model '00+ of Saturn has a quieter operation when engaging the AC, at least I don't hear the 'Click' engagement noise whenever pressing the AC button and the motor is less straining too! (SOHC motor)

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Old 06-29-2002, 01:27 AM   #8
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Is the AC cutoff a sure thing, and if so, what years have it? When I got my car, I wondered about it, but the owners manual says nothing and this is the first I've heard of it. Prior, I had only heard about the feature on performance engines, so I figured GM was too cheap to put it on.

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