1996 Tahoe no start

exp500 · Nov 3, 2021

Simple enough to test for power at injectors, unplug big cable on intake. test connector for power and ground, then test injectors for same while cranking.
The 96 is unique in several areas, so I recommend you get factory service manual. Try ebay.
I'm pretty sure passlock is factory on yours (chip key). Could remove lower column cover and look for ring around lock cylinder.
Remember that computer runs at 5 volts so don't put 12 at the wrong place.
Here is another thread with some diagrams while you wait for your manual for troubleshooting guide on no start.
HELP! NO INJECTOR PULSE,...non running 96 suburban tried everything | Page 3 | Chevy Tahoe Forum | GMC Yukon Forum | Tahoe Z71 | Cadillac Escalade - Tahoe Yukon Forum
Will your snapon read all the modules/two way comms?

Eman85 · Nov 3, 2021

You should have passlock and a security light. If I remember correctly to reset passlock turn the key to the on position for 10 mins. Then turn it off and try to start. Do some google on security ;ight reset.

east302 · Nov 4, 2021

This is on a 96, right? GM brought Passlock out in 95 or so but wasn’t added to the GMT400 line until 98.

After pressurized and with ignition off, does the pressure hold steady for a few minutes (say, above 50 or so) or does it drop to zero?

Have you tried a different pressure gauge?

Sorry, but since life happens and the gauges on these get flaky, are you sure you have gas in it?

If it runs and dies on starter fluid, that’s usually going to point to a pump but your pressure looks reasonable (unless the gauge is really inaccurate).

Here’s the diagram for the injector harness on a 98. There may be a difference between a 96, but it’s probably similar. Ignition on, you should see battery voltage on the connector side pink wires to a ground. The VCM controls the ground to pulse the injectors, so a noid light would be needed for testing that.

rwbruce · Nov 6, 2021

east302 said:
This is on a 96, right? GM brought Passlock out in 95 or so but wasn’t added to the GMT400 line until 98.

After pressurized and with ignition off, does the pressure hold steady for a few minutes (say, above 50 or so) or does it drop to zero?

Have you tried a different pressure gauge?

Sorry, but since life happens and the gauges on these get flaky, are you sure you have gas in it?

If it runs and dies on starter fluid, that’s usually going to point to a pump but your pressure looks reasonable (unless the gauge is really inaccurate).

Here’s the diagram for the injector harness on a 98. There may be a difference between a 96, but it’s probably similar. Ignition on, you should see battery voltage on the connector side pink wires to a ground. The VCM controls the ground to pulse the injectors, so a noid light would be needed for testing that.

View attachment 354700

This is 1996 manufactured in 95 no key chip. The pressure gauge will read 60-62 while the engine is turning over and then drop to 60 and hold. I have a half tank of gas but I will be changing the fuel filter today. I do not think that this is the issue but I can cross that off the list. I do not have a different gauge to try but this one is new. Thanks for the diagram!!! trying stuff today...crossing my fingers.

rwbruce · Nov 6, 2021

Changed the fuel filter tried to start nothing. Pressure at gauge is 62 when turning motor over. Pulled wires out of the injector loom and when the key is on pink wire has power. What is a noid light? I am going to go thru the relearn procedure to see if that works. If it doesn't I am not sure what to try next.

exp500 · Nov 6, 2021

Thanks for the update. Best of luck.

exp500 · Nov 6, 2021

Noid light is injector signal tester nickname. You can use a 194 bulb and fold pins straight to plug +-.
On the relearn, I believe you have to at least touch starter on the end key on sequence.

th3 shifty · Dec 1, 2022

having the same issue... same year truck.. will crank and not kick over.. sometime it will let a slight stumble but wont kick.

exp500 · Dec 2, 2022

@th3 shifty - Please start your own thread so any long troubleshooting stays seperate and in one place. Thanks.

1996 Tahoe no start

exp500

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Eman85

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east302

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rwbruce

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rwbruce

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exp500

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exp500

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th3 shifty

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