Still is not getting any spark in a 3.8l oldsmobile 98 regency, changed the interper, crank and cam sensor is it that there is a ground or something do not know

Could be the security system locking out the injectors. Is the security light on? If you have an extra key try using the other one. Sometimes the pellets wear out.

Possible faulty crank sensor or idle speed controller, fuel pump relay, or ignition module. Get a data scan and see what's sensor might out of range or defective. Check for clogged fuel filter also.

Replace your ignition module under your coil packs.

Three area that are of concern and who goes out first, cam sensor, cranksensor, ICM. To begine with you are a OBD 1, so you can check codes without a scanner you will just jump the DLC and read the flashing light. The cam sensor is the most popular intermittent failure it is located on the lower right side of the engine,above crank pulley,the code it gives is 41,(four long flashes,one short flash),The next is the crank sensor,This is in front above thhe crank pulley,when this sensor goes out,it stop just anywhere,just like the cam sensor,This wont give a code,the only way you will know if this is not operational is when it stall take one sparkplug wire out leave a a 1/4 air gap between wire and coil crank and inspect for spark.if there is no spark,then you narrowed it down to crank and the ICM.The ICM you need a voltmeter or labscope to troubleshoot it. Now if it was the ICM your battery would be dead long time ago,I am going to say do the most populat failure of them all go with the cam sensor. plus you said its *******.

Fuel pressure gauge

if it stoped running on its own u need to see if it has an ignition module a bad module will stop it from starting and it will have no spark

Your symptons sound very similar to a security failure. The year vehicle is also notorious for this system failing. Do you notice a light on the dash that says SECURITY when this happens? If so, check out this link. http://vatspasslockpasskeysecurityhelp.yolasite.com/

Check fuel pressure,spark.If no spark possible crank sensor or ignition module.If no fuel pressure tap the bottom of the fuel tank with a mallet while someone is cranking the vehicle if it starts then you will need a fuel pump.Also if you have spark and fuel but the engine feels like it bucking while turning over,take a hair dryer and heat the coils up.you may have a bad coil pack.After they get warmed it night then start as the coil resistance changes.

The inertia switch is in the rear of the car most times in the trunk area\


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cam sensor is only half of the cam circuit, the other half of the cam circuit is the magnet on the timing chain. the cam sensor reads from the magnet every time the engine completes a revolution,
what happens is the magnet on the chain will break into smaller piece which makes the sensor harder to read every time the engine make a complete revolution.
most likely you'll need to replace the timing chain to fix this.