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Changed 5.7 and now it wont start, NO spark. Put a new CPS in and nothing. PLEASE help

Tiny
GREAT1760
  • MEMBER
  • 1998 GMC SIERRA
  • 136,000 MILES
Did an engine swap with the 5.7 and after I got it all together, it didnt want to start.I shecked the timming and for sparp, found that I didnt have any spark so I changed the CPS. Still dont start. PLEASE help
Monday, April 23rd, 2012 AT 3:58 AM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The computer could be your problem due to different engine-check into it-
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Monday, April 23rd, 2012 AT 4:05 AM
Tiny
GREAT1760
  • MEMBER
  • 2 POSTS
Thanks. How do I check that?
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Monday, April 23rd, 2012 AT 4:13 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I meant computer compatibility-BTW what make you swap engines? Have you tested the CPS wiring for short and open circuit-
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Monday, April 23rd, 2012 AT 7:28 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
If you disturbed the distributor, you likely have it out of synch since it requires a scan tool to set it. That will be in addition to whatever your "no spark" problem turns out to be.I'm assuming you swapped wit the same year and VIN code.
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Monday, April 23rd, 2012 AT 10:20 AM

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