Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

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: 6 months ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 1 minute by:
1/3/2018
Chevy Mechanic: Gary, Chevy Technician replied 6 months ago
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 18,019
Experience: 15 years GM master tech
Verified

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 !

Ask Your Own Chevy Question
Chevy Mechanic: Gary, Chevy Technician replied 6 months ago

the engine will physically crank over and not fire up ?

Ask Your Own Chevy Question
Customer reply replied 6 months ago
Correct
Chevy Mechanic: Gary, Chevy Technician replied 6 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

Ask Your Own Chevy Question
Customer reply replied 6 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 6 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 ?

Ask Your Own Chevy Question
Customer reply replied 6 months ago
Ok. I did that. Still won't start
Chevy Mechanic: Gary, Chevy Technician replied 6 months ago

ok we need to see if it is getting spark next

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

Ask Your Own Chevy Question
Customer reply replied 6 months ago
No. It was running and starting with no problem before the battery died
Chevy Mechanic: Gary, Chevy Technician replied 6 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

Ask Your Own Chevy Question
Customer reply replied 6 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 6 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

Ask Your Own Chevy Question
Customer reply replied 6 months ago
What about the 3rd wire?
Chevy Mechanic: Gary, Chevy Technician replied 6 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

Ask Your Own Chevy Question
Customer reply replied 6 months ago
I know. I changed that sensor this morning. Not fun.
Chevy Mechanic: Gary, Chevy Technician replied 6 months ago

double check the wiring then test power and a ground

Ask Your Own Chevy Question
Customer reply replied 6 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 6 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

Ask Your Own Chevy Question
Customer reply replied 6 months ago
It looks fine. The main computer?
Chevy Mechanic: Gary, Chevy Technician replied 6 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

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

Ask Your Own Chevy Question
Customer reply replied 6 months ago
What about the cam shaft sensor
Chevy Mechanic: Gary, Chevy Technician replied 6 months ago

that will not stop spark just injector pulse

Ask Your Own Chevy Question
Customer reply replied 6 months ago
Ahhhh ok
Chevy Mechanic: Gary, Chevy Technician replied 6 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

Ask Your Own Chevy Question
Customer reply replied 6 months ago
The computer. The the 5" box on the firewall on the drivers side ?
Customer reply replied 6 months ago
It's not the computer
Customer reply replied 6 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 6 months ago
Hello ?
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago
david craig
david craig, Auto Mechanic
Category: Chevy
Satisfied Customers: 5,808
Experience: owner/mechanic at 3D Automotive
Verified

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

Ask Your Own Chevy Question
Customer reply replied 6 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 6 months ago

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

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

what engine is in that thing?

Ask Your Own Chevy Question
Customer reply replied 6 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 6 months ago

standby

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

what engine?

Ask Your Own Chevy Question
Customer reply replied 6 months ago
5.3
Customer reply replied 6 months ago
I have a code. P1518. Picking up a throttle module
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

ok, please standby

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

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

Ask Your Own Chevy Question
Customer reply replied 6 months ago
Can you see the thread between me and the other guy ?
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

standby

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

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

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

do you have a scope?

Ask Your Own Chevy Question
Customer reply replied 6 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 6 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

Ask Your Own Chevy Question
Customer reply replied 6 months ago
I know. Just saying the other guy suggested that it was the computer
Customer reply replied 6 months ago
How would I test the wires from the sensor?
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

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

Ask Your Own Chevy Question
Customer reply replied 6 months ago
Not impossible to do. But it's only me and it's 20 degrees.
Customer reply replied 6 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 6 months ago

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

Ask Your Own Chevy Question
Chevy Mechanic: david craig, Auto Mechanic replied 6 months ago

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

Ask Your Own Chevy Question
Customer reply replied 6 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 6 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

Ask Your Own Chevy Question
Customer reply replied 6 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 6 months ago

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

Ask Your Own Chevy Question
Chevy Mechanic: sprinkles08, ASE Certified Technician replied 6 months ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Chevy
Satisfied Customers: 24,073
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

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?

Ask Your Own Chevy Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a chevy mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask sprinkles08 Your Own Question
sprinkles08
sprinkles08
sprinkles08, ASE Certified Technician
Category: Chevy
Satisfied Customers: 24,073
24,073 Satisfied Customers
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience

sprinkles08 is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,659 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

18,019 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,884 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,948 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,822 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
2003 suburban 1500. Changed TPS. Cam and crank sensor. It's
2003 suburban 1500. Changed TPS. Cam and crank sensor. It's not the computer. Battery is charged. I have fuel flow but I don't know the pressure. I don't have spark. It cranks over but wont start.… read more
Todd Audette
Todd Audette
Automotive Technician
Vocational, Technical or Trade School
362 satisfied customers
2003 2500HD 6.0. Dies while driving shows no codes. Will
2003 2500HD 6.0. Dies while driving shows no codes. Will start back up after it sits a awhile. … read more
Gary
Gary
Chevy Technician
18,019 satisfied customers
I have a 2007 Suburban Z71, 5.3 AFM with 190,000 miles on
I have a 2007 Suburban Z71, 5.3 AFM with 190,000 miles on it. Last week the lights started flickering very rapidly the whole time we were driving. Does it every time we drive now. I checked the altern… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,659 satisfied customers
Chevrolet Suburban 1500 LT: I have a 2004 Chevy Suburban 5.7L
I have a 2004 Chevy Suburban 5.7L with 178K miles. The problem that I am experiencing is the vehicle will die without warning and after it sits for a while, it will start back up. At first it would do… read more
Tim&#039;s Auto Repair
Tim's Auto Repair
mechanic
High School or GED
8,884 satisfied customers
Chevrolet S1500: My 2006 Chevrolet 1500, 4.3L has been chugging
My 2006 Chevrolet 1500, 4.3L has been chugging for the last three days. It would try to , sometimes successfully, die when I would come to a stop or let the RPM fall under 1000. When I put gas in it t… read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
Chevrolet Suburban 1500 LS: I have a 96 chevy suburban, 5.7,
I have a 96 chevy suburban, 5.7, 1500. It won't crank, I've changed the battery, battery cables, crank shaft sensor, battery cables, ignition coil, and fuel pump, it was running, but when it started t… read more
Expert
Expert
Chevy Silverado 1500: Alternator..gauge..9 volt and it wont crank
Hey guys i'm going crazy trying to figure this out. i have 03 Chevy Silverado 1500 5.3 L Alternator is fine, battery is fine had it checked. but the gauge on the dash says 9 volt and it won't crank ov… read more
Nate
Nate
Automotive Technician
Automotive Trade School Degree
319 satisfied customers
01 chevy suburban 1500 lt: 4x4..it dies..rev..it thas not been warmed
Have a '01 chev suburban 1500 lt 4x4 ,AT. 5.3L has a problem ideling when its started cold after sitting overnight, realy notice it when it sits outside in below freezing weather in MN. start good but… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
My 03 duramax died the other day..put battery charger..Drove
My 03 Duramax died the other day and would not turn over after that. Pulled to shop put battery charger on it started up again. Drove it outside died again and will not turn over says battery not char… read more
Hal
Hal
owner/service tech
Vocational, Technical or Trade Scho
848 satisfied customers
2000 Chevrolet Cavalier: airbag..lights came..the headlights..driveway
I have a 2000 Chevrolet Cavalier, driving home the other night the blinker started making a funny buzzing sound. then the airbag and battery lights came on, the speedometer stopped working and then th… read more
cartech
cartech
master tech
High School or GED
3,324 satisfied customers
chevy venture: tuneup..intermittently..fuel pressure..firing is
03 chevy venture, okay until tuneup, now starter turns but won't catch, intermittently. sometimes it starts, sometimes it won't, fuel pressure is fine, battery is fine, firing is fine… read more
zzdaryl
zzdaryl
Lead Auto Tech
Some college and advanced training
6,791 satisfied customers
Truck died in an intersection..alternator..truck wont restart.
Truck died in an intersection it would not restart. Battery is fine and so it the alternator. Truck won't restart. Changed fuel pump and filter. (01 Chevy Silverado 1500 v-6) Still no start. After the… read more
Jay
Jay
Auto Mechanic
Vocational, Technical or Trade Scho
596 satisfied customers
Run fine..first start..a short ride it wont start back up again, it
I just bought an 89'Suburban, it'll run fine on first start up, no issues. But if I stop after a short ride it won't start back up again, it will turn over, just won't start? again this is only after … read more
Gary
Gary
Chevy Technician
18,019 satisfied customers
1999 s10: miles later..distributor gear..worn..truck ran fine
I have a 1999 s10 4.3 vortech, check engine light came on and ten miles later it backfired and died, found distributor gear missing tooth and badly worn. replaced gear and checked cam gear with milwak… read more
AZ_HUNTER
AZ_HUNTER
GM Technician
High School or GED
401 satisfied customers
My 97 K1500 5.7L EFI wont start..running fine..parked..hood
My 97 K1500 5.7L EFI won't start. Been running fine but parked it for 3 days and it suddenly won't start. It's cold here but Batt charge is good and I left it on a slow charge w/ trouble lamp under th… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,659 satisfied customers
chevy: 2wd..all the relays..underhood fuse box..catalytic converters
I have an 05 chevy HD2500 2wd that was recently stolen. They pulled out the starter, stole all the relays from the underhood fuse box, smashed the ignition, took the catalytic converters, pulled the b… read more
Adam
Adam
Technician
Associate Degree
54 satisfied customers
I have a 96 chevy suburban and it turns over but ...
I have a 96 chevy suburban and it turns over but won''t start, I replaced the battery and checked the spark plugs what else could be the problem?… read more
Wrenchtech
Wrenchtech
Vocational, Technical or Trade Scho
616 satisfied customers
2002 chevy trailblazer LT: ext..vortec V6 engine off..30 min
Just got in from work,turned my 2002 chevy trailblazer LT ext. with vortec V6 engine off. 30 min. later got back in went to crank it up and it did not crank. Then I went to turn the key back to the lo… read more
Amedee
Amedee
Automotive Consultant
Vocational, Technical or Trade Scho
19,176 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x