1994 GMC Sonoma random misfire
so my truck has been the hardest vehicle ive ever had to troubleshoot. ill try to keep this as short as i can.
Originally before i got the truck it had fouled the plugs and set for a long time. well i did a tune up and got it running. i noticed it was runnin super rich so i did me research and found out the most likely cause was knock sensors. so i replaced them. it helped but didnt cure it. so because the way these trucks are set up without a thrown code they are really hard to diagnose. OBD1. anyhow because of this i eventually replaced all sensors. map,tps,pick up coil, icm, knock, ignition coil, coolant temp. well this all helped but didnt completely cure it. so i finally replaced the spider injector. problem solved. almost. still getting horrible gas mileage. like 14 on a good day and i have noticed that now all is right that when you drive at a steady speed at any rpm that randomly its like it just quits firing like u turn the key off last for a half a second and continues on but then throws a code. code wont stay on and only says random misfire anyhow. i have had this truck fry 2 ignition control modules for no appearnt reason. it has a autostart on it i did not install it was there when i got it. from what i can tell it was kind of a sloppy job and i am begining to think this could be part of it i have unhooked some of its connections. any thoughts would be great. im outta ideals.
Last edited by Bravo; 10-23-2014 at 05:54 PM.