99 suburban k2500 sometimes no start

[trukdoc]

...common for engine harness{under intake} to develop cracks and wear from rubbing...visually inspect harness for damage...if you suspect the shutdown,pull it ground it and turn on the key...if it doesn't pull in,bump the starter it should pull in and stay in,if it don't it's bad...jd

[christja]

Does anyone know the meaning of the "Security" light on a 99 suburban? It came on today after one of the no starting fits...Could there be some sort of anti theft device malfunctioning? The manual didn't come with the suburban when i got it.

[trukdoc]

...posted on here somewhere is repair for "security"system malfunction...causes no start{nosteal} function...jd

[christja]

Found this while searching the web

The problem sounds like pass key malfunction. The security system shuts off the injectors if it doesn't get the signal from the lock cylinder.



PASSLOCK SECURITY SYSTEM

I will start by telling you that the PASSLOCK security system is engaged only when starting. It will not cause the engine to stall.



The most common intermittent no start problem I am aware of on this system is in the ignition lock and housing.



This system works by the sensing of the ignition lock being rotated. The ignition lock in this vehicle is open. It has been very common to have excessive grease (graphite) in many cases to spray in the housing blocking the magnetic field. Thus, the computer cannot sense the rotation of the ignition lock.



Remove the steering column shrouds. Once the column is exposed, on the top of where the ignition lock is mounted there is a hole. Insert the key into the lock. Rotate the lock to the ON/Start position. Insert an ice pick awl into the hole and pull on the lock cylinder. Once you have removed the lock cylinder, clean the lock with brake cleaner and wipe off. Do the same to the housing it fits into. Reinstall the shrouds. Insert the lock into the housing and rotate and push inward until the lock goes back in place.



This is something the dealers are not familiar with and yet is very common.



There is no special ignition key and the security is built into the lock and the housing with a magnetic field. The vehicle's computer senses the rotation of the lock and thus fuel is delivered.

This will be the cheapest thing to try.

To reset the pass key, turn ignition on to run position and don't crank. Leave key on for 10 minutes before cranking.

Read more: http://www.justanswer.com/questions/...#ixzz0gzhUb7je

[Chevylover]

Hey Jon !

And ? Did you do that ? Did it cure your prob ?


Cu,
Sven

[christja]

haven't had a chance to do anything on it yet...Maybe today....Maybe tomorrow.

Ill keep you posted on if it worked or not.

[christja]

Well, i finally cleaned out the Ignition Cylinder. We shall see...it did have a film of oil and grit on it. Also finally fixed the headlight quandry by replacing the turn signal, high beam, wiper, Cruse control lever.

[christja]

Its been 6 years since i posted this and its just started happening again! Right after i replaced the optical sensor, the no start condition returned. I searched google and it led me back to this thread, which i had total forgotten about! I pulled out the key cylinder again and cleaned it out, and presto! working once again. The passlock system is a failure.

[island boy]

The same thing happened to my truck a few years back so I ordered a bypass Passlok from newrockies .com and never had the problem again and never will.
Check them out.