The 1999 Chevy S 10 pickup truck ignition module can be found on the firewall in the engine compartment. The ignition module will be on the drivers side of the firewall.
The engine computer is the ignition module.
How do you remove the dashboard fascia on a 1999 Chevy Astro?
The 1999 Chevy Astro horn relay switch can be found on the back of the horn. The relay switch will be attached to the horn with two retaining screws.
Try the installdoctor.com. Worked for me.
the firing order is 165432
Inside the distributor
The PCV valve on a 1999 Astro should be located on top of the valve cover. It plugs in and can be easily replaced.
The AC low side service port on a 1999 Chevy Astro van is located next to the firewall. It is the port that is closest to the evaporator.
Remove the retaining ring from the top of your 1999 Chevy Cavalier ignition switch. Slide the ignition switch out and remove the wiring harness from the end of it.