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  1. #1

    Default 1990 Chevy 1500 Driving me INSANE

    someone please help i have a 1990 w/t chevy 1500 pu,4.3 tbi m/t , it all started one day and the truck started to hesitate and never been the same since and i have changed almost every part on the system,it keeps coming up code 45 its a rich code,but the truck put me broke lol,I have put these parts new,rebuilt computer,o2 sensor,plugs,wires,new distributor,coil,map sensor,tps sensor,iac sensor,and the fuel pressure is 13 psi at all times,3 sets of injectors,cat converter,computer chip,Im so fustrated i dont know what to do someone please help.Buy the way when the service engine light comes on the truck runs excellent all help is appreciated

  2. #2


    Welcome to the site! I'm sure that you will be able to get some help with your problems from some of the folks on the site, as they are knowledgable and like to help.

    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  3. #3


    Have you adjusted the tps sensor? For some reason when they sent mine they had it set way too high. Kind of sounds like a timing problem too.

  4. #4


    I have a 93 with a 350, and I finally took it to the dealer. They came up with a bad EGR valve. I replaced it and my truck runs fine.

  5. #5


    i had to replace my cap and rotor, new plugs, new tps switch and coolant temperature sensor, egr valve and relay i did this all at seperate time and in this order egr valve, egr relay,tps switch, plugs, coolant temperature sensor then cap and rotor i didnt start to run right until i changed the cap and rotor and coolant temp sensor so give those a try
    It's a strange moment when you realize that the sounds of the sound of millions of animals, birds, and insects desperatly trying to get laid. KCCO

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