Question about Buick Roadmaster

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Hello there my guardian mechanic one of my neighbors got a buick road master 1996 model engine number 4TR417335,,,,,,,,,,,,,,,,,,,VIN 1G4BN52P3TR417335 got problem no start condition battery good KEY PASS indicate on dash board but when we bypass stater the engine run then shut off after afew second like 20 seconds again bypass starter start again then shutoff engine ther's no head light at all accessories ok pls help to find problem and where the parts defective location

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The light on the dash signals that the key security chip isn't recognized by the antitheft system in your car so it shuts the engine down. To find out why this is happening you must test the antitheft system and if necessary reprogram it - a job that it's better to be done by a dealer. There is a 30-minute programming procedure that does not require a scan tool but it  doesn't always work, especially when the contacts on the key are damaged.
1.Turn the ignition switch to START, then release it to the ON position (the engine will not start).
2. The “Security” light should be ON. After 10 minutes, it should turn OFF.
3.Turn the ignition switch OFF and after five seconds, repeat steps 1 and 2.
When this procedure has been done three times, turn the ignition switch OFF. The control units will exchange the correct commands during the next start-up attempt.
If this fails and you don't want to spend the money on a dealer visit  there is another option: install an aftermarket antitheft system, this way the original system will be bypassed.

Posted on Aug 26, 2010

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The fault can be the electrical section itself. Try to see why the circuits are not in order.
First of all check the voltage to the main switch, the switched out put and the starter output. If there is supply to the main but the switched outputs are not coming out then the loop must happedn to all circuits or the car will start and stop as is happeneing now. So check this out or try to clean the contacts with a cleaner...... if this will help through the key holes.
If not think of replacing the switch because many auxillary circuits are going through the switched output.
Now ccheck the line to the cluster switch, why the head lights relay is not activated.check input voltage if not present check fuse or line break .... loop a new line.
But if the input voltage is present then checck iff the output comes out and to the relay , if not change switch.
One the switched powers are correct then crank to start, check if power gets absent to engine because of failure of the firing.
retrace and check. on fuel, fuel pump, and plugs. check on main wires , failure in voltage to coils., open out plugs , clean , crank without plugs to check spark and if confirmed reinstall the plugs.
Now the car must start confirming the spark is consistent.
Hope these tips helps.

Posted on Aug 26, 2010

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