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Cranks over but won't start. Changed the crank shaft sensor.

Customer Question
Cranks over but won't...

Cranks over but won't start. Changed the crank shaft sensor. Still no good

Mechanic's Assistant: Does the vehicle stall at low speeds? Does it sputter?

No never

Mechanic's Assistant: What is the model/year of your Chevy?

03 suburban 1500

Mechanic's Assistant: Are you fixing your Suburban 1500 yourself? What have you tried so far?

Myself

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

The battery had died from sitting. Befor that it was starting fine. I charged the battery and now it suddenly won't start

Submitted: 3 months ago.Category: Chevy
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Answered in 1 minute by:
1/3/2018
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 17,779
Experience: 15 years GM master tech
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Welcome! My name is ***** ***** I will do my best to assist you with this problem.Ask me about added features such as phone contact anytime if you wish !

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Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

the engine will physically crank over and not fire up ?

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Customer reply replied 3 months ago
Correct
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

can you see if the engine will somewhat run on starting fluid or carb cleaner being sprayed into the throttle body opening ?

we need to see if its missing spark or fuel

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Customer reply replied 3 months ago
Sprayed starter fluid in. That didn't do any good. Sounded the same.
I alone so I can't tell if I have spark. No one to turn the key
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

we have to be sure what we are missing

until you get a helper disconnect both battery cables for 5 minutes then touch the 2 cables together for 1 minute then reconnect them to the battery will it still not start ?

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Customer reply replied 3 months ago
Ok. I did that. Still won't start
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

ok we need to see if it is getting spark next

and it was doing this before you changed the crank sensor ?

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Customer reply replied 3 months ago
No. It was running and starting with no problem before the battery died
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

can you be sure all the fuses in the underhood fuse box are good

if they are then we need to see if we have spark next

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Customer reply replied 3 months ago
No spark. I rigged up a string to turn the key.
Put a screw driver in the coil and had the plug close. No arching at all
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

we need to test the crank sensor 3 wires next

with the key ON one wire should be 12 volts and one should be a good ground

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Customer reply replied 3 months ago
What about the 3rd wire?
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

we will test that if we need too

now also when you pull the starter out it is very tight between the starter and the crank sensor be sure the connector is not unplugged on the crank sensor or that any of the crank sensor wires are damaged at all

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Customer reply replied 3 months ago
I know. I changed that sensor this morning. Not fun.
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

double check the wiring then test power and a ground

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Customer reply replied 3 months ago
I have 12 volts on one and seems to be a good ground on the other 2
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

be 100 % sure the wiring looks good at the crank sensor if it does then this issue is more than likely a bad computer

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Customer reply replied 3 months ago
It looks fine. The main computer?
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

if all the fuses look good the odds are that is bad yes the engine computer but to be 100 % sure a scan tool needs to be connected to the truck to check for data and see if you can communicate with the computer and see crank RPM

please dont forget to rate me here at Justanswer

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Customer reply replied 3 months ago
What about the cam shaft sensor
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

that will not stop spark just injector pulse

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Customer reply replied 3 months ago
Ahhhh ok
Chevy Mechanic: Gary, Chevy Technician replied 3 months ago

please dont forget to rate me here at Justanswer

you can always get me back for FREE for any follow up any time with this question even after you rate me here at Justanswer

if you have any questions please ask as i do not get credit for my work until you rate me here at Justanswer

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Customer reply replied 3 months ago
The computer. The the 5" box on the firewall on the drivers side ?
Customer reply replied 3 months ago
It's not the computer
Customer reply replied 3 months ago
I have an identical truck. Swapped computers. The bad truck computer will start the good truck. The good truck computer won't start the bad truck.
Customer reply replied 3 months ago
Hello ?
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago
david craig
david craig, Auto Mechanic
Category: Chevy
Satisfied Customers: 5,145
Experience: owner/mechanic at 3D Automotive
Verified

Hi Im David, are you getting rpms while cranking the engine?

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Customer reply replied 3 months ago
The rpm won't register until the engine has started. I have another truck just like it. That's how I know. While cranking the cluster is off. Once running the cluster registers
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

ok, have you tested for a signal coming out of the crank sensor?

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Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

what engine is in that thing?

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Customer reply replied 3 months ago
The other guy had me text the wires. 12 on one wire ground on the other
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

standby

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Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

what engine?

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Customer reply replied 3 months ago
5.3
Customer reply replied 3 months ago
I have a code. P1518. Picking up a throttle module
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

ok, please standby

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Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

there are 3 wires to the crank sensor. you still need to check for a signal coming out of it

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Customer reply replied 3 months ago
Can you see the thread between me and the other guy ?
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

standby

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Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

having ground on the signal wire doesnt mean anything. you need to test it while the engine is cranking

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Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

do you have a scope?

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Customer reply replied 3 months ago
I asked him about that. He didn't get back to me about that. I don't have a scope.I installed a new crank sensor.
I swapped the computer from my other suburban. It's not that. Bad truck computer started my good truck. Good truck computer wouldn't start the bad truck.
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

im not suggesting the computer is bad. i just want to see waht kind of signal is coming out of the sensor. it could be the wire

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Customer reply replied 3 months ago
I know. Just saying the other guy suggested that it was the computer
Customer reply replied 3 months ago
How would I test the wires from the sensor?
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

back probe the dark blu/white wire while cranking and set the meter on ac volts

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Customer reply replied 3 months ago
Not impossible to do. But it's only me and it's 20 degrees.
Customer reply replied 3 months ago
I've changed crank and cam sensor. Throttle possible sensor. It's not the computer. Can you advise what would be next if it was the wires at the crank sensor
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

not sure what you mean what would be next if it was the wires?

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Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

i gotta get home. ill be back on in about an hour. this shop is driving me nuts today.

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Customer reply replied 3 months ago
You said to check the wires and set it to ac. If I did that and found there to be an issue what would be the next step ?
This whole thing is odd. It was fine before the battery died. Now I have a charge and it won't start. I feel like it must be something stupid since I've done everything else.
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

if you don't have ac voltage on the signal wire then the sensor is bad. I know its new. I just want to verify it there

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Customer reply replied 3 months ago
Oh ok. I can't think of anything else other than a broken wire in the harness
Chevy Mechanic: david craig, Auto Mechanic replied 3 months ago

if theres a signal then we will need to do a continuity test of the signal wire to the pcm

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Chevy Mechanic: sprinkles08, ASE Certified Technician replied 3 months ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Chevy
Satisfied Customers: 23,778
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

Do you still need help?

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