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Cranks but will not start or shudder or backfire

Tiny
KRAYTRO
  • MEMBER
  • 1989 DODGE DAKOTA
  • 3.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 148,000 MILES
To start with I've replaced the timing chain and gears whole distributor, distributor cap and button, wires, plugs, map sensor, ICM or ignition control module, injectors. Fuel pump, EGR valve, o2 sensors, ignition coil, basically everything except the brain, and internal parts, with that being said the motor is fuel injected with throttle body. It's getting real strong spark, I can pour fuel down the throttle body turn it over it will not shudder, pop backfire or crank it just spins over, I'm at wits end. Can you please help?
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Thursday, April 25th, 2019 AT 12:40 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Did you check the compression? Low compression will cause this.

https://www.2carpros.com/articles/how-to-test-engine-compression

Does the check engine light come on with the key on? Need to see if the computer is communicating.

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

Are there any codes stored?

Did you check spark at the plugs? I know you said it had spark but where did you check it? If you had spark and put fuel in throttle and it did not start, then compression is my next step.

Roy

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Thursday, April 25th, 2019 AT 1:05 PM

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