1997 Bonneville SE, driving yesterday and car suddenly died. Has a V8 engine. Engine will turn over but not start. No check engine light came on. Running great up until yesterday. Is it fuel pump, spark problem. Any info great. Wife needs car for work.

car turns off while driving without warning - 1998-2002 ...

https://www.ifixit.com/.../car+turns+off+while+driving+without+wa...

iFixitwhat would cause my car to turn off while driving & what cause it to start with ... Before you do these, you may consider doing a quick check of your battery terminals. ... So changing out the ignition control module is not a one fix for life job. ... and all thesudden the check engine light would come on and the car would die.

Diagnosing Intermittent Stalling Issues - Underhood Service

www.underhoodservice.com/diagnosing-intermittent-stalling-issues/

Oct 1, 2008 - Replacing a perfectly good ISC motor or solenoid won't fix the ... If the engine stalls while idling or driving, the engine may be running ... The engine may startand idle fine, but run out of power or even stall at highway speeds. ... If the engine is running normally one minute, but suddenly quits, .... Then dies.

Engine Performance Problems Due to Crankshaft Position ...

You need to know Battery Voltage is very important for PCM, Sensors and so on.
With a voltmeter on the battery terminal engine off, with a good full charged battery you should read 12.6v. If not the battery needs to be charge.
Clean battery"s terminals for a good connection and ground terminal body side.

Hope it helps.

Have you had it scanned to see what code is in the ecm for the check engine light?

the engine did not die because of a defective starter. either some mechanical or electrical component has gone awry, or you ran out of gas. putting a new battery and/or starter in a car with a dead engine will not cause the engine to start.

you need to have someone with some mechanical knowledge take an actual look at it. someone over the internet cannot diagnose nor divine which of the many components has malfunctioned causing the car to quit.

Easy way to check. Crank the vehicle while running remove one of the battery cables from the battery if the ingine dies your alternator is bad. I'll bet it is the alternator.

are your dasboard lights at full brightness?Turn your headlight switch(it may be on the interior light detent).BTW I drive a '97 Bonneville SE and one great thing about these cars is that if you leave a light on it will shut off after about 5 minutes so it won't drain your battery overnight.

When was the last time the spark plugs and wires were replaced?

on the exhaust

Check your battery cables,, they are probably loose or corroded. Side mount batteries that hold multiple cables have this problem that occurs over an extended period of time. Cleaning the connections and retightening the hold down bolt may fix it. Sometimes a 3/8 bolt and a washer with a nut can be used to get
a more positive holding force to keep the cable tight.

1st thing to do is have the system tested for the code that caused the check engine light to come, you may also have a fuel pump starting to fail or many other things, the check engine light may be the key. How many wiles on the car?