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Have A 1997 gmc 1500 5.7 won't start, it has spark, fuel

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Have A 1997 gmc 1500...
Have A 1997 gmc 1500 5.7 won't start , it has spark, fuel pressure. Well run on ether but no injector pulse need help
Submitted: 1 year ago.Category: Chevy
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Answered in 1 minute by:
8/27/2016
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago
kalamykid
kalamykid, Shop Owner/ Tech
Category: Chevy
Satisfied Customers: 4,559
Experience: I HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY Q
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If you try to start the engine and then leave the ignition switch in the run position, does the security light flash?

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Customer reply replied 1 year ago
No security light also have replaced ignition control module and crank sensor
Customer reply replied 1 year ago
Checked ground on thermostat housing that is also good
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Do you have scan tool that will show live data from the computer?

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Customer reply replied 1 year ago
I'm getting a lost signal while cranking also no codes
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

What signal are you loosing?

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Customer reply replied 1 year ago
Scanner says was key on retry, every time I crank over to get data as in rpm, timing, ect.
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Have you checked the fuel pressure?

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Customer reply replied 1 year ago
fuel pressure within spec
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

What was the pressure reading?

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Customer reply replied 1 year ago
52 psi
Customer reply replied 1 year ago
On top of intake the injector connector I'd getting power but no ground for injector pulse
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Have you had the battery disconnected recently?

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Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Will the security light come on if you turn the ignition switch from off to run?

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Customer reply replied 1 year ago
No
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

I need you to check the bcm fuse please with a test light and see if you have power on both sides of the fuse.

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Customer reply replied 1 year ago
it is getting power on both sides
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Have you ever seen the security light come on?

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Customer reply replied 1 year ago
No is there a way to reset I can try that maybe the bulb Is burnt
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

If the bulb is burnt out you will have to replace it to reset the security system. It may reset with a bad bulb, but you will not know for sure if the system is ready or not if the light does not work. You can try the reset if you would like with out checking the bulb, here are the steps you have to do to reset it.

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Customer reply replied 1 year ago
Ok i will try and get back to you tomorrow thank you
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

You are very welcome.

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Customer reply replied 1 year ago
Getting code p1351a
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Did you get it to start?

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Customer reply replied 1 year ago
No changed pickup coil still nothing, suspecting ecm
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Do you have a piece of wire around a 16 gauge and at least 4 foot long?

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Customer reply replied 1 year ago
I do
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Lets see if we can jump power to get it to start. Look on your computer and see if you have a clear or gray colored plug. In this plug there will be a white wire in pin 9. use a paper clip and run it along side the wire so the paper clip is making contact with the metal pin in the plug, attach one end of your jumper wire to the paper clip, then look at the main plug of the ignition control module and find the white wire in that plug and use another paper clip to jump the new wire in and see if the truck will start.

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Customer reply replied 1 year ago
Working on that get right back to you
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

ok

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Customer reply replied 1 year ago
Nothing at all
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

And you are sure you hit the correct white wire in the clear plug?

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Customer reply replied 1 year ago
9 jump to white wire on ignition module
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Do you have a digital volt meter?

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Customer reply replied 1 year ago
I do not
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Do you have a test light?

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Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

What I want you to do next will be to unplug the clear plug from the pcm, as well as the ignition module, connect your test light to a good + battery source and the test light on each end of the whit wire and see if the test light lights up.

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Customer reply replied 1 year ago
It does light up
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Then you have a short in the white wire to a ground, you have two options, find the short, or cut both ends of the white wire and hard wire in the jumper wire you where using.

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Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

The white wire is a dedicated wire from the ignition module to the pcm.

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Customer reply replied 1 year ago
Ok i think I misunderstood if I disconnect both wire harnesses and check for ground there is no ground what I did was jump a hot wire on one side to see if the other side was receiving power and not cut
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

ok lets do the correct test, leave both ends unplugged, and with your test light connected to a good battery + and the tip of the test light on each end of the wire one end at a time see if the test light lights up.

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Customer reply replied 1 year ago
No does not light up
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

PLug the ignition module back up, turn the ignition switch on and with your test light connected to a good ground, see if the test light lights up when you test the pcms white wire, with the pcm still unplugged.

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Customer reply replied 1 year ago
No power
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Do you still have the old ignition module?

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Customer reply replied 1 year ago
I do
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

reconect it and retest please.

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Customer reply replied 1 year ago
Same no power to white wire at pcm side
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

now unplug the icm and plug the pcm back up and retest with both modules please.

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Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Forget about the module, you will have it unplugged. Sorry.

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Customer reply replied 1 year ago
Same results
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

One last test. With the ignition switch in the run position, use your test light connected to a good ground and see if you have power to all the fuses. Do this by touching the tip of the test light to the metal pieces sticking up through the plastic of the fuses. If the light lights up on one side but not the other replace the fuse.

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Customer reply replied 1 year ago
All fuses have power
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Did you test all the fuses in both fuse boxes?

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Customer reply replied 1 year ago
14 and 8 have no power in cab every other fuse had power including under hood
Customer reply replied 1 year ago
14 lights up with lights tuned on and 8 lights up while cranking
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Will the truck still start on starting fluid if you plug everything back up?

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Customer reply replied 1 year ago
Will start with starting fluid
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Can you make sure it still will please?

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Customer reply replied 1 year ago
It still well start on starting fluid yes
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

We have a big problem. the test results you have given me say it should not start.

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Customer reply replied 1 year ago
With both end of wires unplugged.. ignition control module unplugged and pcm unplugged test light to + no light test light to - no light wire is not cut as I added power to one end and other side had power plugged everything back in same results starts on starting fluid
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Are you sure you gave me the correct code?

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Customer reply replied 1 year ago
that is the only code.. cleared code crank a few times and it's back over and over
Customer reply replied 1 year ago
My main concern is why my scanner is losing data connection while cranking?
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Unplug the icm and with the ignition switch in the run position, see if the test light will light up when you test all the wires in the icm plug please. Tell me what color wires have power please.

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Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

That is normal, the ignition switch cuts power to the obd2 port during cranking.

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Customer reply replied 1 year ago
2 outer have power 2 inner have no power
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

What color are the wires please.

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Customer reply replied 1 year ago
I'll have to recheck I had to leave but If I remember all had power except white wire
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Then the code has to be caused by a fault in the pcm and it will need to be replaced.

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Customer reply replied 1 year ago
That is my guess will order pcm install and I will let you know. Thank you
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

You are very welcome.

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Customer reply replied 1 year ago
Replaced pcm now no start at all
Customer reply replied 1 year ago
Ok got it to start on starting fluid so back to control module Red has power white has no power black has no power white with black stripe has power
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 1 year ago

Did you do the relearn on the security system?

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