No crank help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69BUCKET · 04-22-2018, 05:11 PM

69 c10 2wd w/ 5.3 & th350...after everything was hooked up...i have no cranking of engine....purple wire at ignition does get power when turning switch to crank...but nothing at the starter wire? Also brake light on gauges turns on when trying to start engine... All fuses good are good....any suggestions?

69BUCKET · 04-22-2018, 06:16 PM

Wasn't in park completely...cranking and starting now.......but doesn't stay running....now what?....eng. Light comes on and stays on while it starts and fires up...

ls1nova71 · 04-22-2018, 06:51 PM

Do you have a way to pull the codes?

69BUCKET · 04-22-2018, 07:02 PM

Quote:

Originally Posted by ls1nova71

do you have a way to pull the codes?

no...well...i have a diablo sport tuner...can that pull them without a vin?...

e015475 · 04-22-2018, 09:46 PM

Did you have the VATS disabled in the ECM?

69BUCKET · 04-22-2018, 09:55 PM

It was supposed to...but the way things have gone with these guys...i wouldn't be surprised if the ecm wasn't done correctly. Any way to tell for sure once i get a scanner?...

e015475 · 04-22-2018, 10:08 PM

Don't know about a scanner, but it is exhibiting what motors do when the VATS isn't deleted.

Before I pulled the ECM and had the VATS checked, I'd make sure I had a steady pressure on the fuel rail and make sure it isn't simply running out of fuel.

69BUCKET · 04-22-2018, 10:12 PM

Quote:

Originally Posted by e015475

Don't know about a scanner, but it is exhibiting what motors do when the VATS isn't deleted.

Before I pulled the ECM and had the VATS checked, I'd make sure I had a steady pressure on the fuel rail and make sure it isn't simply running out of fuel.

By just disconnecting fuel line?...

e015475 · 04-22-2018, 10:17 PM

There are codes for the passlock type VATS. Try your scanner and see what comes up

e015475 · 04-22-2018, 10:21 PM

I'd put a gauge on the schrader valve on the fuel rail and watch what happens when you try to start it. I should stay pretty solid at about 57 or 58 psi. (IIRC) at all times.

If you don't have a fuel pressure gauge, most Autozones have them in their tool loan program

69BUCKET · 04-22-2018, 10:24 PM

Quote:

Originally Posted by e015475

I'd put a gauge on the schrader valve on the fuel rail and watch what happens when you try to start it. I should stay pretty solid at about 57 or 58 psi. (IIRC) at all times.

If you don't have a fuel pressure gauge, most Autozones have them in their tool loan program

I will try that first....thank you.

e015475 · 04-22-2018, 10:33 PM

Just to clear up a little confusion.

Assuming that you had the VATS deleted, it could be exhibiting the same symptoms if you were not pushing enough fuel to the rail and the pressure drooped out - bad pump, stuck regulator, whatever.

I don't know if VATS turns off the fuel pump as part of the start denial - but I'd think it would. so you might want to put a test light to the fuel pump too and make sure it is continuously powered and it isn't VATS turning off the fuel.

69BUCKET · 04-22-2018, 10:42 PM

Great info sir...i will follow your advice first before i start with ecm.

ls1nova71 · 04-22-2018, 10:55 PM

Ok I'm confused. You said it wouldnt stay running, then said that the check engine light is on when it runs? I thought you meant you could keep it running? How long is it running? If never more than a couple of seconds then I'd say it is VATS.

69BUCKET · 04-23-2018, 12:03 AM

Quote:

Originally Posted by ls1nova71

ok i'm confused. You said it wouldnt stay running, then said that the check engine light is on when it runs? I thought you meant you could keep it running? How long is it running? If never more than a couple of seconds then i'd say it is vats.

yes...it only stays on for a second or 2...the eng. Light is on when switch is turned on, cranking...and for the second it is on...

ls1nova71 · 04-23-2018, 04:08 AM

That sounds EXACTLY like VATS hasnt been tuned out......

69BUCKET · 04-23-2018, 09:22 AM

Does the VATS trick work?...Read about swapping ECM with a truck and putting mine in place while turning ignition on and off....does this work?...

69BUCKET · 04-24-2018, 12:50 AM

Anyone try this?...

ls1nova71 · 04-24-2018, 01:56 AM

You have to have a running truck with the same computer from what I've seen, but never tried it myself.

69BUCKET · 04-24-2018, 03:58 PM

Only cause I'm not in a rush and about done with project...I will track a truck down and try this before sending ECM off.

04-22-2018, 05:11 PM	#1
69BUCKET Registered User Join Date: Oct 2017 Location: Newton Posts: 216	No crank help 69 c10 2wd w/ 5.3 & th350...after everything was hooked up...i have no cranking of engine....purple wire at ignition does get power when turning switch to crank...but nothing at the starter wire? Also brake light on gauges turns on when trying to start engine... All fuses good are good....any suggestions?

04-22-2018, 06:16 PM	#2
69BUCKET Registered User Join Date: Oct 2017 Location: Newton Posts: 216	Re: No crank help Wasn't in park completely...cranking and starting now.......but doesn't stay running....now what?....eng. Light comes on and stays on while it starts and fires up...

04-22-2018, 06:51 PM	#3
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: No crank help Do you have a way to pull the codes? __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

04-22-2018, 09:46 PM	#5
e015475 Registered User Join Date: Nov 2013 Location: Show Low, Arizona Posts: 778	Re: No crank help Did you have the VATS disabled in the ECM?

04-22-2018, 09:55 PM	#6
69BUCKET Registered User Join Date: Oct 2017 Location: Newton Posts: 216	Re: No crank help It was supposed to...but the way things have gone with these guys...i wouldn't be surprised if the ecm wasn't done correctly. Any way to tell for sure once i get a scanner?...

04-22-2018, 10:08 PM	#7
e015475 Registered User Join Date: Nov 2013 Location: Show Low, Arizona Posts: 778	Re: No crank help Don't know about a scanner, but it is exhibiting what motors do when the VATS isn't deleted. Before I pulled the ECM and had the VATS checked, I'd make sure I had a steady pressure on the fuel rail and make sure it isn't simply running out of fuel.

04-22-2018, 10:17 PM	#9
e015475 Registered User Join Date: Nov 2013 Location: Show Low, Arizona Posts: 778	Re: No crank help There are codes for the passlock type VATS. Try your scanner and see what comes up

04-22-2018, 10:21 PM	#10
e015475 Registered User Join Date: Nov 2013 Location: Show Low, Arizona Posts: 778	Re: No crank help I'd put a gauge on the schrader valve on the fuel rail and watch what happens when you try to start it. I should stay pretty solid at about 57 or 58 psi. (IIRC) at all times. If you don't have a fuel pressure gauge, most Autozones have them in their tool loan program

04-22-2018, 10:33 PM	#12
e015475 Registered User Join Date: Nov 2013 Location: Show Low, Arizona Posts: 778	Re: No crank help Just to clear up a little confusion. Assuming that you had the VATS deleted, it could be exhibiting the same symptoms if you were not pushing enough fuel to the rail and the pressure drooped out - bad pump, stuck regulator, whatever. I don't know if VATS turns off the fuel pump as part of the start denial - but I'd think it would. so you might want to put a test light to the fuel pump too and make sure it is continuously powered and it isn't VATS turning off the fuel.

04-22-2018, 10:42 PM	#13
69BUCKET Registered User Join Date: Oct 2017 Location: Newton Posts: 216	Re: No crank help Great info sir...i will follow your advice first before i start with ecm.

04-22-2018, 10:55 PM	#14
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: No crank help Ok I'm confused. You said it wouldnt stay running, then said that the check engine light is on when it runs? I thought you meant you could keep it running? How long is it running? If never more than a couple of seconds then I'd say it is VATS. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

04-23-2018, 04:08 AM	#16
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: No crank help That sounds EXACTLY like VATS hasnt been tuned out...... __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

04-23-2018, 09:22 AM	#17
69BUCKET Registered User Join Date: Oct 2017 Location: Newton Posts: 216	Re: No crank help Does the VATS trick work?...Read about swapping ECM with a truck and putting mine in place while turning ignition on and off....does this work?...

04-24-2018, 12:50 AM	#18
69BUCKET Registered User Join Date: Oct 2017 Location: Newton Posts: 216	Re: No crank help Anyone try this?...

04-24-2018, 01:56 AM	#19
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: No crank help You have to have a running truck with the same computer from what I've seen, but never tried it myself. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html



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04-24-2018, 03:58 PM	#20
69BUCKET Registered User Join Date: Oct 2017 Location: Newton Posts: 216	Re: No crank help Only cause I'm not in a rush and about done with project...I will track a truck down and try this before sending ECM off.

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