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Crank but no start

Tiny
JOMILLS
  • MEMBER
  • 2008 DODGE CARAVAN
  • 3.3L
  • 6 CYL
  • 235,000 MILES
Hello,

i have the van listed above, it was misfiring and giving codes of p0300, p0203 and p0303. If remember correctly it had something to do with the fuel injector wiring. I changed out the wiring harness for the fuel injectors and now it won't fire. I tested the spark plug for spark and it is there. The plugs were wet so it seems to have fuel. It was running before the harness swap, but poorly and now it won't fire. It has a new, strong battery, I replaced the cam position sensor and the coil pack and the relays seem to be okay. What do you think?
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Tuesday, January 12th, 2021 AT 10:40 AM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
If you have a shorted injector it can cause the PCM to go full on causing the engine to flood. How wet are the plugs? Also does the system have spark? This guide can help us see what's going on:

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

and

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

Let us know what happens and please upload pictures or videos of the problem.
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Wednesday, January 13th, 2021 AT 10:07 AM
Tiny
JOMILLS
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  • 5 POSTS
Thanks Ken.
The plugs were pretty wet. The plugs have spark. If the PCM was stuck full on, how would I know?
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Wednesday, January 13th, 2021 AT 2:54 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
The plugs will be dripping wet. Lets remove the injectors and use this guide to test them:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Can you please shoot a quick video with your phone so we can see what's going on? that would be great. You can upload it here with your response.
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Thursday, January 14th, 2021 AT 8:38 AM
Tiny
JOMILLS
  • MEMBER
  • 5 POSTS
Thank you sir.
I’ll work on that trouble shooting this weekend when I have time.
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Thursday, January 14th, 2021 AT 9:30 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Please let us know what you find. We are interested to see what it is.
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Friday, January 15th, 2021 AT 9:28 AM
Tiny
JOMILLS
  • MEMBER
  • 5 POSTS
Hello Ken,

i checked voltage coming to the fuel injector plug and it never got above 5 volts.
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Thursday, January 21st, 2021 AT 1:30 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hmm, it should be 12 volts. it sounds like the PCM has gone out. To be sure lets do a CAN scan which is the future of automotive repair. you can get a CAN scanner from Amazon for about $50.00. here is a video to show you how:

https://youtu.be/InIlnsjOVFA

Here is the location of the PCM and replacement instructions I would check the electrical connector for corrosion. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Friday, January 22nd, 2021 AT 10:33 AM
Tiny
JOMILLS
  • MEMBER
  • 5 POSTS
Hello Ken,

can you recommend a can scanner that can do this? I am not certain of what I need.

Thank you.
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Friday, February 5th, 2021 AT 9:11 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
This will work:

https://www.amazon.com/gp/product/B007XE8C74/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=2carprcom-20&creative=9325&linkCode=as2&creativeASIN=B007XE8C74&linkId=6ce6162b02db9e7d896854b59e1837be

let me know.
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Friday, February 5th, 2021 AT 10:43 AM

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