Cranks over but no start

Tiny
MRJAXX
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
One day fine and the next just cranks over. I checked all fuses, tried starting fluid, then I took off a plug wire and found no spark. Actually touched it without any kind of shock. Any suggestions about what to check?
Regards, Todd
Do you
have the same problem?
Yes
No
Wednesday, June 22nd, 2016 AT 12:01 PM

6 Replies

Tiny
CARADIODOC
  • EXPERT
Step one is always to read and record the diagnostic fault codes. The people at most auto parts stores will do that for you for free. If you cannot get the truck there, you will need a simple code reader to read the codes yourself.

Do you have a 5.7L or a 6.5L? The 6.5L is a diesel, and I do not think you will be looking for spark on that one!

For the 5.7L, the best suspects are the crankshaft position sensor and the camshaft position sensor. The Engine Computer needs the signals from them for spark and injector timing.
Was this
answer
helpful?
Yes
No
+1
Wednesday, June 22nd, 2016 AT 10:43 PM
Tiny
MRJAXX
  • MEMBER
Where should I locate the positioning sensors and how do I check if they are bad. I heard to crank the engine and see if the rpm gauge moves?
Was this
answer
helpful?
Yes
No
Thursday, June 23rd, 2016 AT 1:00 AM
Tiny
CARADIODOC
  • EXPERT
Easiest is to get a code reader. I use a scanner but for this it does the same thing, just costs a real lot more.
Was this
answer
helpful?
Yes
No
Thursday, June 23rd, 2016 AT 1:04 AM
Tiny
MRJAXX
  • MEMBER
Where is the crankcase sensor located on the engine? Down by the water pump area?
Was this
answer
helpful?
Yes
No
Thursday, June 23rd, 2016 AT 2:29 AM
Tiny
CARADIODOC
  • EXPERT
The crankshaft position sensor is behind the vibration damper. The camshaft position sensor is inside the distributor. Those are for the 5.7L engine. If you have something else, you have to tell me which engine you have.
Was this
answer
helpful?
Yes
No
Thursday, June 23rd, 2016 AT 2:50 AM
Tiny
RENEE
  • ADMIN
Hello Mrjaxx,

Here is a link to an article that features written step by step instructions and pictures explaining how to do the scan yourself, also I have included a link to our YouTube channel with a how to video on code scanning. Most scanners are inexpensive to purchase, you can purchase one online from sites like Amazon.com. Once you have the codes please get back to us so that we can further assist you. We are always happy to help.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://youtu.be/YV3TRZwer8k

Thank you for visiting 2CarPros.com.

Kindest regards,

Renee
Admin
Was this
answer
helpful?
Yes
No
Thursday, June 23rd, 2016 AT 7:17 PM

Please login or register to post a reply.

Recommended Guides