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Old 11-25-2017, 11:50 PM   #1
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Default 2002 Tahoe

Turns over but won't start. Changed fuel pump and crank shaft sensor. What else could be wrong?
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Old 11-26-2017, 12:50 AM   #2
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Did you check fuel pressure before replacing the pump?

Do you have spark? Injector pulse? Any codes?
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Old 11-26-2017, 08:08 AM   #3
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Did you check fuel pressure before replacing the pump?

Do you have spark? Injector pulse? Any codes?
it'* not throwing codes I'm getting spark plenty of fuel pressure...and how do i check injector pulse?
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Old 11-26-2017, 10:07 AM   #4
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Security light flashing?
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Old 11-26-2017, 10:09 AM   #5
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If you have spark on all cylinders, and PLENTY OF FUEL PRESSURE, as indicated with a gage on the system, then I am thinking you might have a PassLock Security problem, which disables the injectors....

Easiest way to check this? Can of carb cleaner........crank vehicle, doesn't start.....now spray carb cleaner into the throttle body, and then try to start vehicle....if it almost starts, or starts/runs for a few seconds(as carb cleaner is used up), my guess is the PassLock system....

You say there are no codes....but you need a scan tool capable of reading "B" codes, which most cheap scanners/code readers can't do......

GM screwed up with their SECURITY lights, as far as Passlock was concerned......

With the PassKey system, you knew right away.....turn the key on, the SECURITY LIGHT COMES ON FOR 3 SECONDS AND GOES OUT....IF THERE WAS A PROBLEM, THE LIGHT WOULD STAY ON....

Not the same with PassLock....turn key to on, and SECURITY LIGHT comes on and stays on, it does not go out....it only goes out if the car starts.....so you have no indication if you have a Passlock problem....under certain conditions, sometimes when you turn the key to on, the SECURITY LIGHT will flash, indicating a problem, but that doesn't happen all the time....
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Old 11-26-2017, 11:49 AM   #6
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Exactly what he ^ said.
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Old 11-26-2017, 05:10 PM   #7
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Security light flashing?
yes the security light has been on since I bought the truck...it hasn't given me any problems so far until just recently....is there I good fix to this? I'm just trying to get it back on the road being my only means of transportation
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Old 11-26-2017, 07:52 PM   #8
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Noid light is the proper tool for checking to see if the fuel injectors are getting thier impulse signal.
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Old 11-26-2017, 08:34 PM   #9
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Noid light is the proper tool for checking to see if the fuel injectors are getting thier impulse signal.
my question is how do i fix it though?
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Old 11-26-2017, 08:34 PM   #10
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Quote:
Originally Posted by Tech II View Post
If you have spark on all cylinders, and PLENTY OF FUEL PRESSURE, as indicated with a gage on the system, then I am thinking you might have a PassLock Security problem, which disables the injectors....

Easiest way to check this? Can of carb cleaner........crank vehicle, doesn't start.....now spray carb cleaner into the throttle body, and then try to start vehicle....if it almost starts, or starts/runs for a few seconds(as carb cleaner is used up), my guess is the PassLock system....

You say there are no codes....but you need a scan tool capable of reading "B" codes, which most cheap scanners/code readers can't do......

GM screwed up with their SECURITY lights, as far as Passlock was concerned......

With the PassKey system, you knew right away.....turn the key on, the SECURITY LIGHT COMES ON FOR 3 SECONDS AND GOES OUT....IF THERE WAS A PROBLEM, THE LIGHT WOULD STAY ON....

Not the same with PassLock....turn key to on, and SECURITY LIGHT comes on and stays on, it does not go out....it only goes out if the car starts.....so you have no indication if you have a Passlock problem....under certain conditions, sometimes when you turn the key to on, the SECURITY LIGHT will flash, indicating a problem, but that doesn't happen all the time....
what is a good fix for that
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