Being a ase mechanic for 25 years, iv'e seen many a buick v6 do this. the camshaft chain upper sprocket (the bigger one) has a magnet glued on to it. This is what the camshaft sensor reads. THEY ALWAYS COME UNGLUED, usually after 60k miles or so. Replace timing chain set will fix it.
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The warning light means the module does not accept the chip in the key. It has nothing to do with the engine computer. The chip in the key has failed, or the sensor in the lock cylinder, or the VATS module has failed.
Be sure the AIR BAG/VATS fuse 10 amp, is good. there is a STARTER ENABLE RELAY up high on the left of the steering column. I ASSUME the anti theft light is not flashing?" at the STARTER ENABLE RELAY the YELLOW wire is hot in the crank mode and comes out large PURPLE to the starter. the small purple wire is hot in the crank mode if the fuse (air bag/vats) is good. the small yellow is grounded through the park switch and the VATS module (anti theft)
Recommend you install the fix detailed at the webpage: http://vats.likeabigdog.com/
I have done this successfully in the past and believe it will fix your problem for a small cost. You will need a soldering gun or iron, an ohmmeter, and some knowledge of electronics. If you are not comfortable with the instructions, perhaps you have a friend that can help you.
No. GM's vats system has a resistor in the ignition key. The Vats has a control module that needs to see the value of that resistor to start the car. If it doesn't see the resistance the car will crank but will not start up. Try your back up key. If that doesn't work the the Vats system needs to be replace. GM has only 15 different value resistors to A million different possible ignition key cylinder combonations.
you will need to replace the vats lock cylinder and key. the wires break at the ignition switch. the new cylinder will come with a dummy key . you will need to get a new vats key cut to that blank. take yor old key or vin# to the dealership so they wil know what your vats# is.
assuming the key is the 1 the you have always been using and no battery changes in the vehicle , there are 4 fuses involved with the security system , i would start by checking them . right rear of engine compartment holds 1 maxi fuse #4 20 amp PCM VATS , and 3 other others in the I/P fuse box , get a tester and check all fuses .
This fix was for a 1996 Buick LeSabre.
I found the key reader in the ignition switch was faulty.
Made up a resistor pack to match the key resistance, cut the orange wire which comes out of the steering coloumn (it contains two white wires) from the reader to the VATS module and soldered it into the two white wires going into the VATS module.
This bypasses the security system so now any properly cut key will start the car.