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Check engine light is flashing 2009 Dodge Charger


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JLighthill
User

Aug 19, 2016, 6:21 AM

Post #1 of 8 (1690 views)
Check engine light is flashing 2009 Dodge Charger Sign In

I'm working on a 2009 Dodge Charger 5.7 Hemi police car. Diagnostic test showed #3 and #5 was misfiring. So I changed the plugs and coil packs first. Still running rough so we changed 2 injectors (#3 and #5) with Mass Air Flow sensor and map sensor. Now the check engine light is flashing while driving down the road. Car is running rough while sitting still. Diagnostics says #3 cylinder is still misfiring. What could be the problem?


kev2
Veteran
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Aug 19, 2016, 6:41 AM

Post #2 of 8 (1680 views)
Re: Check engine light is flashing 2009 Dodge Charger Sign In

 
this is a 5.7L or 6.1L?
post ALL the codes you are getting. Your scanner will read ALL codes ?
flashing CEL needs attention ASAP as cat damage is likely.
Do a fuel pressure test then with KOEO observe pressure drop and post - drops Xpsi in 5 minutes.
Have you checked spark at #3?
Next would be a compression test...
>> you changed injectors 3 & 5 - new injectors OR swapped 3 to 5?


JLighthill
User

Aug 19, 2016, 6:52 AM

Post #3 of 8 (1676 views)
Re: Check engine light is flashing 2009 Dodge Charger Sign In

As stated in my original post, this is a 5.7. I will have to check the codes real quick and get right back. Yes, my scanner reads all codes. I put NEW injectors in, not swapped.


JLighthill
User

Aug 19, 2016, 8:07 AM

Post #4 of 8 (1672 views)
Re: Check engine light is flashing 2009 Dodge Charger Sign In

As of right now, car runs fine while idling. When throttle is pushed, code P0303 comes up. (cylinder #3) Only runs bad when given gas. I changed the spark plug also.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 19, 2016, 8:19 AM

Post #5 of 8 (1668 views)
Re: Check engine light is flashing 2009 Dodge Charger Sign In

Already asked, IS #3 GETTING SPARK WITH A TESTER?


T


JLighthill
User

Aug 19, 2016, 8:27 AM

Post #6 of 8 (1664 views)
Re: Check engine light is flashing 2009 Dodge Charger Sign In

Yes it is.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Aug 19, 2016, 8:39 AM

Post #7 of 8 (1655 views)
Re: Check engine light is flashing 2009 Dodge Charger Sign In

Compression test. Lifter problems are common on those.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


kev2
Veteran
kev2 profile image

Aug 19, 2016, 9:18 AM

Post #8 of 8 (1646 views)
Re: Check engine light is flashing 2009 Dodge Charger Sign In

yes you did say 5.7L - gotta work on my reading comprehension...:)
before spending any more lets do some TESTING...
You are rechecking codes- you can see ALL codes. ie P141x? - Any chance it displays live data?
You confirmed spark at #3 ... How did old #3 plug look- wet, dry, black, tan - could be a clue... NGK only!
Try the fuel pressure leak down as I suggested even with new inj its a fast test when doing fuel pressure.
I was hoping for an easy fast such as plug, injector (wiring), fuel pressure ...
Next we would do compression and a vacuum leak check - use the old school vac leak ck fast easy inexpensive..


(This post was edited by kev2 on Aug 19, 2016, 9:37 AM)






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