1993 Nissan Sentra Check Engine Light

1993 NISSAN SENTRA
90,000 MILES • 4 CYL • FWD • AUTOMATIC
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JFIGUEROA1
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The Check Engine light has recently come on in my dash board. I don't know the cause of it. I recently did a tune-up and oil change. The light came on a day after I took a 100 trip. The road is known for its curves and steep downhills, so I'm wondering if this had anything to do with this light coming on. I do recall changing to the second gear while I was going downhill, but it was only for a moment.

The morning when the check engine light came on, I noticed the engine was a bit louder and rough sounding, not its normal sound during warm up. I'd like to know what I can do, what I should check or if I just should take the car to the shop and have them run a diagnostic check. Thanks for the help.
Aug 19, 2008 at 7:00 PM
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SERVICE WRITER
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IF the CEL came on after your tune up, then carefully retrace your steps to be sure that you didn't forget to reconnect something, tighten a clamp, a disconnected vacuum hose etc. This is a good first step regardless. Visual inspection.
Aug 19, 2008 at 7:52 PM
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MASTERTECHTIM
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the computers on these cars are real primitive so when the light comes on there is a real problem. sounds like you might be describing a egr valve that may be stuck open a little. definitely have it checked out, it will be worth it in the long run, trust me. let me know what the diagnosis is and i can kind of guide you of importance and if its possible you can repair yourself
Aug 19, 2008 at 7:54 PM
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JFIGUEROA1
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I should've been more specific about the tune-up, I didn't mean recently, I meant a while ago. About a month and a half ago, so I don't know if that is the problem, I will however, follow your advice and do a visual check under the hood to see if anything has come off.
I plan to take the car to the shop for the test, they'll charge me 50 bucks, which I guess is worth the peace of mind. Tomorrow when I get back from the shop, I'll post the results and see what you recommend.Thanks for your replies.
Aug 19, 2008 at 9:31 PM