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Re: 89 suburban has multiple codes, help requested.
Isolated, The TPS tells the computer how much throttle you are giving therfore how much gas flow. The knock sensor adjusts the timing (slightly) to prevent spark knock (valves rattling like a diesel engine). The EGR problem may lie with the EGR vacuum solenoid, if that is not it, it may be computer. I have an 1988 Suburban with the 454 and get the same EGR code.I replaced the solenoid, but that did not work. On to the EGR valve or computer at the worst.
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USS Carl Vinson CVN-70
1994 Buick Century
1988 Chevy Suburban C20 454
1989 GMC C1500 305
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