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xiolo1
New User
Oct 11, 2006, 4:54 PM
Post #1 of 5
(2332 views)
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97 Sunfire RPM troubles
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I have a 97 Sunfire, with a 5 speed, pretty much no extras, 2.2L.
When the car is at low idle (approx 1000 rpm), and I step on the gas the rpms drop down to 500 before popping up to where ever I have the accelerator at, obviously causing problems as I let the clutch out. I've found that when stopping at a light, with the clutch depressed, if I keep my foot on the gas to keep the idle at 1500, when I start going again the rpms don't drop.
I recently changed the oxygen sensor as I had burnt it out. I'm not sure if the problem started when I burned out the O2 sensor, or if this happened after I replaced it. I tested my vacuum lines, and there are no leaks. Any ideas how to fix this?
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DanD
Veteran
/ Moderator
Oct 12, 2006, 3:31 AM
Post #2 of 5
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Re: 97 Sunfire RPM troubles
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There are many things that can cause this that the list is to long to post. I would start by having the computer scanned; yes for codes but also scanned by someone that is familiar with what “normal” data should be and how the different inputs and outputs react to each other. Short of that I think that you’ll be throwing parts at this car in the hope of falling over the cause of this hesitation.
When was the last time you did a servicing on the car; ie tune-up?
Dan.
Canadian "EH"
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xiolo1
New User
Oct 13, 2006, 9:12 PM
Post #3 of 5
(2318 views)
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Re: 97 Sunfire RPM troubles
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did a tune-up last fall. cleaned out the throttle body and changed the fuel filter tonight. that wasn't it either. :( Any other ideas?
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DanD
Veteran
/ Moderator
Oct 14, 2006, 12:28 AM
Post #4 of 5
(2316 views)
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Re: 97 Sunfire RPM troubles
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Scan data, fuel pressure tests, service bulletins, checking for updated calibration (programming) for the computer all of which takes hands on, an experienced technician, access to equipment and information.
Shall I go on or should I just say it’s time to take the vehicle in and have it diagnosed?
Short of this you’re going to be throwing parts at this car; which could be more expensive then paying a garage to diagnose this.
Just because you give a shop permission to test it doesn’t mean you have to allow them to repair it. Be up front with them tell them everything you can about the problem and that your intensions are to try the repair yourself.
They will or should appreciate your honesty and charge you accordingly.
I do a fair amount of diagnostic only work for people and other shops. It doesn’t bother me that someone else is going to bolt the part on; anyone can do that. But the satisfaction of finding the problem that they couldn’t and making a bit of money along the way is quite rewarding.
Dan.
Canadian "EH"
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xiolo1
New User
Oct 14, 2006, 7:48 AM
Post #5 of 5
(2313 views)
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Re: 97 Sunfire RPM troubles
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That makes sense. And yeah, could save me a whole lot of money, time and frustration. Thank you Dan. 
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