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CRANKS BUT WON'T START

Tiny
SKYCOP91
  • MEMBER
  • CHEVROLET BLAZER
I was driving at 60 mph and all of a sudden it just shut off. No warning, no sounds, no smells, just shut off as if I turned the key off.
I've replaced the ingnition coil, the ignition module, & the map sensor. I have spark at all plugs, and the fuel pressure is within specs at the test port. The motor cranks but won't fire. No codes are showing on the OBD II.
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Sunday, November 25th, 2007 AT 6:43 PM

6 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Crank engine over for 10secs then remove a sparkplug do you smell fuel and see wet sparkplug. If not check the spider unit under the upper plenum.

Got this funny feeling you don't have injection pulses.
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Friday, January 29th, 2021 AT 2:13 PM
Tiny
SKYCOP91
  • MEMBER
  • 6 POSTS
Tried that and do have fuel smell but spark plug was only a little damp. Thought it could be a timing chain problem but I pulled the distributor cap and it rotates which led me to give up on the timing chain possibliity.
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Friday, January 29th, 2021 AT 2:13 PM
Tiny
RASMATAZ
  • MECHANIC
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Check the fuel pressure and comeback with the readings
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Friday, January 29th, 2021 AT 2:13 PM
Tiny
SKYCOP91
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  • 6 POSTS
Fuel pressure readings at test port was 59. Book says 57 to 61 is within peremeters.
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Friday, January 29th, 2021 AT 2:13 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I assumed you've checked for spark. Got spark open up the IMTV and inspect the spider
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Friday, January 29th, 2021 AT 2:13 PM
Tiny
SKYCOP91
  • MEMBER
  • 6 POSTS
I tested my spark plug wires even though I had spark at the plugs and it turns out the wires were bad. The resistance in the wires was way out of tolerence, still giving spark but not a strong enough one. As soon as I replaced them it fired right up. Thanks for all your advice. I look forward to passing on any assistance I can.
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Friday, January 29th, 2021 AT 2:13 PM

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