Update on 90 5.8
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From: Missouri
Update on 90 5.8
So I finally found some time to learn how to pull codes from an obd1 and i did.
These are the codes, and what ive found them to mean
13-ISC did not respond properly (extends to touch throttle then retracts for KOEO) - ISC
28-Vane Air Temperature (VAT) sensor out of range - VAT
73-Rerun test, if 73 is still output replace TPS
Could anyone be a bit more specific now in what could possibly be wrong. I Just dont know enough about engines to find where some of these things are located, or what to do, and as always thanks everyone for puttin up with me
These are the codes, and what ive found them to mean
13-ISC did not respond properly (extends to touch throttle then retracts for KOEO) - ISC
28-Vane Air Temperature (VAT) sensor out of range - VAT
73-Rerun test, if 73 is still output replace TPS
Could anyone be a bit more specific now in what could possibly be wrong. I Just dont know enough about engines to find where some of these things are located, or what to do, and as always thanks everyone for puttin up with me
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after talking to my dad for a bit, he explained to me what the tps is, but doesnt know where its located on my truck. and i still dont know what the vat sensor is, or what the code means by out of range
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Codes 13 and 78 are from the engine running tests and if you didn't exectute the procedure correctly these will be set.. so you can ignore them.
As for code 28, at what part of the test did you get this code? If is was before the engine was started I have to ask if the engine was warmed up beforehand.. because that is required or you will get false codes for the Intake Air Temp sensor(IAT which is sometimes called the VAT) and the engine coolant temp(ECT) sensor.
As for code 28, at what part of the test did you get this code? If is was before the engine was started I have to ask if the engine was warmed up beforehand.. because that is required or you will get false codes for the Intake Air Temp sensor(IAT which is sometimes called the VAT) and the engine coolant temp(ECT) sensor.
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From: Ottawa, Ontario
Well if you never had the engine running then you counted wrong because there is no way to get those code numbers in the engine off portion of the test. See the link for LOTS more info on running the test, sensors, and the whole EFI system.
Fuel Injection Technical Library » Home
Fuel Injection Technical Library » Home
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12-Cannot control RPM during ER Self-Test high RPM check.
41-No HEGO switching detected always lean (right side).
So That means its running rich correct? because its detecting little oxygen? or am i backwards?
Either way, it shure smells rich. Also, could this make it run horrible like it does? and what could be causing the Oxy/Fuel mix to be off
41-No HEGO switching detected always lean (right side).
So That means its running rich correct? because its detecting little oxygen? or am i backwards?
Either way, it shure smells rich. Also, could this make it run horrible like it does? and what could be causing the Oxy/Fuel mix to be off
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Joined: Jan 2011
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From: Over the hump in Pahrump
Wanna test it !!!
OG what kind of tester/code reader are you using? My truck is a 90, 5.8 also and I was thinking about getting a device to see what secrets it holds. My only concern is cost, (retired) not a lot of disposable $$$'s. I would appreciate information on the equipment you are using, the costs (if you can) and do you recommend it to a non-pro mechanic type ... ME Thanks !!! 
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From: Missouri
You can use just a wire, its extreamly simple, After grounding a circut to the computer you just count flashes from the check engine light.
Go here for more info Fuel Injection Technical Library » How To Run a Self-Test
Go here for more info Fuel Injection Technical Library » How To Run a Self-Test
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12-Cannot control RPM during ER Self-Test high RPM check.
41-No HEGO switching detected always lean (right side).
So That means its running rich correct? because its detecting little oxygen? or am i backwards?
Either way, it shure smells rich. Also, could this make it run horrible like it does? and what could be causing the Oxy/Fuel mix to be off
41-No HEGO switching detected always lean (right side).
So That means its running rich correct? because its detecting little oxygen? or am i backwards?
Either way, it shure smells rich. Also, could this make it run horrible like it does? and what could be causing the Oxy/Fuel mix to be off
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From: Over the hump in Pahrump
Conanski wins again !!!
I will be getting my hands on the Equis 3145 as soon as $$'s are available ... do I need the extension wires to go with it ? Your help is appreciated ...Thanks. Dave 
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The definitions for these codes can be misleading at times, I suspect the correct wording for this code should be that the computer is at it's lean adaptive limit and there is no O2 switching, and that would correspond with an overly rich condition. As for what is causing this, it could simply be that the O2 sensor is dead, but it could also be that the sensor heater circuit is open or the fuse is blown. It could also be rich because extra fuel is being drawn in from a leaking fuel pressure regulator, or because you have the fuel transfer problem between front and back tanks which causes the evaporative system to flood with raw gas and that gets drawn iinto the engine.