cranks but will not start and no spark?

2004 GMC ENVOY
208,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
Avatar
JOERUSS1953
  • MEMBER
  • 13 POSTS
when i turn the key to crank the engine it wont start and sometimes when i turn the key the starter will keep turning for a few seconds. i checked for a spark when cranking there is no spark. what can cause no spark at the spark plugs boot?
Nov 26, 2016 at 8:49 PM
Advertisement
Avatar
CATAFINA
  • CERTIFIED EXPERT
  • 98 POSTS
It sounds like the crankshaft angle sensor is not working this guide can help us check it with the location of the sensor in the diagrams below.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
Image (Click to enlarge)
Attached Media
Nov 26, 2016 at 10:20 PM
Avatar
RENEE L
  • CERTIFIED EXPERT
  • 1,260 POSTS
Hi Joeruss1953,

I am sending you a link to an informative article from this site that features written step by steps intructions and a video on what to check when your cranks but will not start.

https://www.2carpros.com/articles/car-cranks-but-wont-start

I hope this helps you and if you need further assistance please return to the site we are here to help.

Thank you for visiting 2CarPros and have a wonderful rest of your day!

Kindest regards,

Renee
Admin
Nov 28, 2016 at 2:14 PM
Advertisement
Avatar
ALLENYAHWEH
  • MEMBER
  • 2 POSTS
truck been fine, went to crank and no start but excellant spinn over power , just wont crank. can hear the pumps come on as they are supposed to . after futher investigation i have no spark. checked wires at coils , pink wire has 12v , have a ground on blk wire but nothing on blue signal wire. all fuses are good. crank sensor been replaced. still no spark
Nov 19, 2020 at 9:43 AM (Merged)
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
scan for codes first then check resistance of cam and crank sensors they may be high not allowing it to start. check fuel pressure as well auto parts rend the gauges.
Nov 19, 2020 at 9:43 AM (Merged)
Avatar
S55580B
  • MEMBER
  • 7 POSTS
After a short road test for a pitman arm replace, now it won't start. No spark at coil. Had a MAF sensor dtc but I erased it before jotting the number down. No history of any no start problems. Checked connections at coil, crank sensor, ECM, & MAF sensor. Cap & rotor look OK , but they're after the coil.
Nov 19, 2020 at 9:43 AM (Merged)
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
check fuses underhood and scan for codes and check fuel pressure with a gauge should be 60-66psi key on engine off
Nov 19, 2020 at 9:43 AM (Merged)
Avatar
S55580B
  • MEMBER
  • 7 POSTS
All fuses are good. This is a no spark no start. I already tried starting fluid in the throttle body.
Nov 19, 2020 at 9:43 AM (Merged)
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
if you dont' have spark you can put all the starting fluid into engine and it still won't start. you shouldn't use that stuff anyhow. scan for codes like I said in first reply
Nov 19, 2020 at 9:43 AM (Merged)
Avatar
S55580B
  • MEMBER
  • 7 POSTS
Re-Read my first paragraph.
Nov 19, 2020 at 9:43 AM (Merged)
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
if you erased it and it is the same problem the code should come back again. try another key as I think that still has the diode in key for anti theft. then check cam and crank sensor connections.
Nov 19, 2020 at 9:43 AM (Merged)
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
also check your ignition module autoparts can do that.
Nov 19, 2020 at 9:43 AM (Merged)