5.7 TBI loss power

efipaneltruck · May 17, 2020

PlayingWithTBI said:
All TBIs only have 1 O2 sensor and they're on the driver's side exhaust manifold. With code #13, it sounds like it isn't hooked up.

That's a lot of codes, check your ground wires on the T-Stat housing, those are for the ECM. #25 is for MAT (Manifold Air Temp) which I don't think a 92 even had one (I could be wrong)? As @Schurkey said, you need to figure out what ECM you have.

Here's a troubleshooting guide.
TBIcodes.pdf

when you say : check your ground wires on the T-Stat housing,, those are for the ECM . what do you mean by--- T-Stat housing -- im not sure to understand sorry

about the ECM there is a stiker on it and here waht i see

SERV NO 1227747
86 ANLW K391031991

magimerlin · May 18, 2020

T-stat housing means the thermostat housing..

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PlayingWithTBI · May 18, 2020

efipaneltruck said:
about the ECM there is a stiker on it and here waht i see

SERV NO 1227747
86 ANLW K391031991

Here's some info and wiring diagrams, as well as some suggestions on how to "tune" the 7747 ECM. It wasn't offered in 92 so, it seems you have a ******* child there. ANLW calibration is for an 89 5.7L with 2.73 gears, unless someone burned or installed a different chip. I would go through the wiring diagrams and verify all of your sensors are hooked up correctly.

http://www.gearhead-efi.com/Fuel-Injection/showthread.php?304-1227747-ECM-Information-42

Here's some definitions for our EFI systems, FYI.
http://www.gearhead-efi.com/gm-ecm-pcm-conversion/efi-dictionary.html

efipaneltruck · May 24, 2020

after looking deeply into the wiring harness
i find that the wire for the P/N (b10 at ecm ) was not connected to anything just cut . keys on this wires is hot 12v
i rode that it should be grounded ??
also i rode if i dont use the VSS or park/neutral indicator switch then both wires should be connected together

also do i need EGR ?

evilunclegrimace · May 24, 2020

PlayingWithTBI said:
All TBIs only have 1 O2 sensor and they're on the driver's side exhaust manifold. With code #13, it sounds like it isn't hooked up.

That's a lot of codes, check your ground wires on the T-Stat housing, those are for the ECM. #25 is for MAT (Manifold Air Temp) which I don't think a 92 even had one (I could be wrong)? As @Schurkey said, you need to figure out what ECM you have.

Here's a troubleshooting guide.
TBIcodes.pdf

You are correct, '92 does not have a MAT. it would still have a MAP

efipaneltruck · May 25, 2020

the wire for the P/N (b10 at ecm ) was not connected to anything just cut . keys on this wires is hot 12v
i saw on this diagram it should be 0 volt key on

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5.7 TBI loss power

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magimerlin

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PlayingWithTBI

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evilunclegrimace

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