1999 Chevrolet S-10 Pickup Logo

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Posted on Jul 12, 2009
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Insalled new computer,cranks but wont start

Insalled new computer,had if flashed by vin #. truck cranks but wont start,security light stays on while cranking.

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  • nite315 Jul 12, 2009

    it ran on 2 cyl prior. 50lbs fuel pressure,its got spark. injectors are not fireing. security light on dash stays lit while cranking. put old ecu in and it starts on 2 cyl

  • nite315 Jul 13, 2009

    I replaced the computer because it was not firing the 2 front injectors on the 2.2. The truck did run, but you had to flutter the gas pedal to keep it running, and obiviously couldn't drive it. After the security light problem, I put the old processor back in and the truck started. Put the new processor in again, same problem with security light.

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  • Master 4,669 Answers
  • Posted on Jul 12, 2009
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Does it start and die after 1-2 seconds or just cranks and never fires? Did it run before you installed the computer or are you trying to cure a no start problem?

  • Anonymous May 26, 2013

    it rolls the motor over but it has on coil spark

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2011 Infinity qx56 wont start...replaced ecm will crank but wont start and security light stays on while its cranking...does the key fob need to be reprogrammed? Can I do it without towing it to a dealer?
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Year make model.
Some cars have security chips in key, around ignition switch, or around gear shifter. If your cars security light stays on and wont start something in 1 of those 3 keeping it from starting.
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security on means your passlock sensor is probably at fault.. you will need the who key barrel and sensor to be changed and reprogrammed. can be done yourself but not easy.

first remove old system and replace new assembly. might be easier to replace the whole column switch and all. once you have changed the parts you now have to reprogram cylinder into computer.
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then turn key to start again then again leave key in ignition.for 10 minutes

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1999 S-10 Pickup

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2011 Infinity qx56 wont start...replaced ecm will crank but wont start and security light stays on while its cranking...does the key fob need to be reprogrammed? Can I do it without towing it to a dealer?

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