1995 Chevy Tahoe trouble shoot

Hello, If your still obd1, check for codes, you can do that without a code-reader.

If your tbi are the injectors leaking gas? You should be able to look and see. How is the fuel pressure? A faulty coolant temp sensor can cause some issues?

How do i check codes without a code reader ?
When an injector is leaking do i check when i here the pump working or when i am turning the engine over? the fuel pressure is good and the coolant sensor is new

If the datalink connector looks like the picture, obd1, use a jumper between the A & B terminals. Turn the key to on, no crank. The mil starts flashing, you count the flashes to get the codes. There may be a decal under your hood, that tells you if your obd1 or obd11 compliant? On a TBI system, you can see the injector drip, once you build pressure, cycling the key on and off, should build pressure.

how do i figure out what the code 1-2,1-2,1-2,3-3,3-3,3-3-3,4-5,4-5,4-5 means also the injectors are not leaking thanks

When i place the jumper between a-b terminals the service engine light blinks in this pattern 1 flash a pause and them 2 flashes it repeats this sequence 3 times next sequence that repeats 3 times is 3 flashes and pause with anither 3 flashes and the next 3 time repeating sequence is 4 flashes with a pause and another 5 flashes.
My question is what does these flashes represent or wher can i find out what these flashing codes mean

[quote:25d3546902="falkon"]When i place the jumper between a-b terminals the service engine light blinks in this pattern 1 flash a pause and them 2 flashes it repeats this sequence 3 times next sequence that repeats 3 times is 3 flashes and pause with anither 3 flashes and the next 3 time repeating sequence is 4 flashes with a pause and another 5 flashes.
My question is what does these flashes represent or wher can i find out what these flashing codes mean[/quote:25d3546902]

Usually code 12 means, diagnostic mode.