Posted by Determined on March 07, 2020 at 07:24:29 from (216.130.212.201):
In Reply to: GM OBD1 Question posted by jeff nwoh on March 06, 2020 at 13:50:40:
Been a while since I played with TBI trucks so if I am off slightly don't shoot me.
TBI and high idle, throttle body gaskets are a common problem.
A sticky PCV valve or cracked/disconnected hose to vapor cannister will give you a high idle condition as well.
On a 95 the computer is not able to tell much about the EGR valve, all it does is wait until the engine is warm and when the driving and RPM parameters are met it switches the solenoid to control the vacuum to the valve, it then wants to see a change in what the oxygen sensors readings are and the corresponding fuel adjustments.
If it does not see a change it assumes there is an EGR fault.
A vacuum leak can prevent the valve from cycling the computer will not see a change so it reports a fault.
In addition when a large vacuum leak exists the computer will be trying to control the high RPM's by closing the IAC as much as it can in an attempt to stabilize the air fuel ratio, the readings it is getting from the sensors at this point are not representative of what parameters it is expecting to see and the list of codes grow and grow.
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