Timing for this engine

1996 CHEVROLET SUBURBAN
73,000 MILES • 7.4L • V8 • 2WD
Avatar
MRROBER
  • MEMBER
  • 9 POSTS
Does this have to be done by scanner or is there a drop wire on this truck? The timing is staying right at -26 degrees. That the reading on the scanner anyway. I can't set it by timing light. I just a little too old school I guess.
Mar 28, 2016 at 9:46 AM
Advertisement
Avatar
WRENCHTECH
  • ✓Experienced Mechanic
  • 20,761 POSTS
The ignition timing on this engine is not adjustable in any way so don't even try. If you attempt to turn the distributor you will only throw the camshaft offset out the window and the will run terrible and set a P1345 code.
Mar 28, 2016 at 10:30 AM
Avatar
MRROBER
  • MEMBER
  • 9 POSTS
Well, I tried and it runs like crap and now it IS bringing ing the P1345 code again. At this point whats the solution to correcting my screw up? Do you just tighten the distributor down somewhere and then clear the codes or what? To me this doesn't make sense but I believe you. I think I'm going back to carburation. HahHa. Problem is it's not funny.
Mar 28, 2016 at 12:44 PM
Avatar
WRENCHTECH
  • ✓Experienced Mechanic
  • 20,761 POSTS
You have to use a professional scan tool that can read cam offset data and adjust the distributor to bring that number to zero. It will allow a tolerance of plus or minus 4 degrees before it sets the code.
Mar 28, 2016 at 6:56 PM
Avatar
MRROBER
  • MEMBER
  • 9 POSTS
I bought a scanner and did it correctly. That's a costly timing process. Oh well now I can do the rest of the Suburbans. Thanls for your help.
Apr 5, 2016 at 2:23 AM
Avatar
WRENCHTECH
  • ✓Experienced Mechanic
  • 20,761 POSTS
You have to remember. That is not timing that you are adjusting. You are just synchronizing the injectors and the rotor to the cap. It should never be touched unless the distributor has been removed.
Apr 5, 2016 at 2:32 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.