Service Engine Soon light on...no code

Hello,

My 1996 3.1 V6 (74,000 miles)Corsica had the service engine soon light come on after a minute of driving. This had never happened before so we had it in the shop and he told us that there was a vacuum leak...but gave my husband no code to type in here at the automotive forum. I asked about it and there was no code in the machine that was used to check out my car. I have continued to drive my car without any going wrong with it...it drives fine. I'm tempted to place a post-it-note in front of the service engine soon light...I've done that with my ABS light on my 92 Lumina when that was my everyday driver with over 300,000 miles.

I need to know if the vacuum leak is a serious problem. Can I do damage? It is my job to find out what we need to check. We usually do the work ourselves so any starting point would be appreciated.

Thanks in advance,
Mary Jo

hello rural,vacuum leaks usually cause no serious problems.high/low idle maybe a stall etc.if the cel came on then there should be a code stored in memory.go have it ck. auto zone does it free.the repair shop could have erased it but maybe not.Good Luck & let us no

Knowing the trouble code would help substantially.

There are some common places for vacuum leaks on the 191 V-6. The fuel pressure regulator line, the PCV line, and the grommet on the throttle body are the usual suspects. That grommet hides under a metal bracket where the PCV vacuum line connects.