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95 chevy blazer security light on wont start

Customer Question
95 chevy blazer security light on wont start
Submitted: 8 months ago.Category: Chevy
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Answered in 2 minutes by:
9/19/2017
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago
TIM MOHR
TIM MOHR, ASE MASTER TECH
Category: Chevy
Satisfied Customers: 16,528
Experience: 30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
Verified

Hi, my name is ***** ***** the security light is on, then you most likely have broken wires in the column, that goes from the keylock cylinder to the security module, it is very common to break off right at the key lock cylinder, you can bypass the system, is this something youwould like to do?

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Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

thesen use a resistor chip in the key, the little black square on the key is the chip, you need to use an ohm meter to measure the resistance, then go to radio shack and purchase a resistor, they are about a dollar, then wire the resistor into the small white wires at th base of the column connector, this will fool the computer into thinking the proper key is always there, we do this alot,Tim

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Customer reply replied 8 months ago
Regular key no chip
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

if the security light is on, then it has to have the chip, are yu sure its a 1995?

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Customer reply replied 8 months ago
10/94 build date
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

then it has to have the resistor chip, are sure they did not give you the Valet key?

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Customer reply replied 8 months ago
Ran with this key before
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

is the security light inside the cluster, or is a external light on the dash?

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Customer reply replied 8 months ago
External
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

ok, this is not factory, if the key does not have a chip, then this is an aftermarket security system, do have a key fob on this?

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Customer reply replied 8 months ago
No
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

ok , can you try locking and unlocking the drivers door with the key from outside?

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Customer reply replied 8 months ago
Tried no luck
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

ok, you will need to find the controller for the aftermarket security system, and remove it, it could be anywhere under the drivers side dash, you will have to locate it?

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Customer reply replied 8 months ago
Removed security still no luck spark and fuel ok
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

does it crank, but not start, or does the starter not even turn over?

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Customer reply replied 8 months ago
CRANKS AWESOME
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

Ok, whenyou say fuel is good, did you check the fuel pressure, and if so how much was it?

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Customer reply replied 8 months ago
64
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

64 psi???

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Customer reply replied 8 months ago
Yep
Chevy Mechanic: TIM MOHR, ASE MASTER TECH replied 8 months ago

ok, that is way to high, the pressure should be between 9 and 13 psi, if it is at 64, then you either have a bad fuel pressure regulator, or the return line from the throttle body is restricted, you said you had the tank out to replace the pump, it is possible you got the return line kinked or pinched, when you put the tank back in, I have seen this alot, if its at 64 psi, it will flood out the cylinders and it wont start,Tim

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TIM MOHR
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