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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
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Check engine light is flashing 2009 Dodge Charger
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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?
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kev2
Veteran
Aug 19, 2016, 6:41 AM
Post #2 of 8
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Re: Check engine light is flashing 2009 Dodge Charger
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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?
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JLighthill
User
Aug 19, 2016, 6:52 AM
Post #3 of 8
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Re: Check engine light is flashing 2009 Dodge Charger
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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.
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JLighthill
User
Aug 19, 2016, 8:07 AM
Post #4 of 8
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Re: Check engine light is flashing 2009 Dodge Charger
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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.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 19, 2016, 8:19 AM
Post #5 of 8
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Re: Check engine light is flashing 2009 Dodge Charger
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Already asked, IS #3 GETTING SPARK WITH A TESTER?
T
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JLighthill
User
Aug 19, 2016, 8:27 AM
Post #6 of 8
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Re: Check engine light is flashing 2009 Dodge Charger
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Yes it is.
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 19, 2016, 8:39 AM
Post #7 of 8
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Re: Check engine light is flashing 2009 Dodge Charger
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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.
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kev2
Veteran
Aug 19, 2016, 9:18 AM
Post #8 of 8
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Re: Check engine light is flashing 2009 Dodge Charger
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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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