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  #1  
Old 04-01-2012, 02:31 PM
MPD141 MPD141 is offline
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Default Check Engine Light Flashing

Hope somebody can help. My 2005 Ram 1500 Hemi had a check engine light on. 68K miles so I put in iridium plugs and new wires. Then the engine light started flashing and truck ran poorly, tach jumping around. Then I read here that I should have used stock plugs. So I replaced the plugs with standard Champions. But I still occasionally have a flashing engine light and poor running. This seems to only happen when the truck is cold and once warmed up, the problem goes away. Does anybody have an idea what could be wrong. I've also read here that maybe I should unhook the battery and reset the computer. Thanks for any help.
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Old 04-01-2012, 03:59 PM
Busa101 Busa101 is offline
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Start with the 'redneck reset' as you stated. I doubt if this is a fix but who I could be wrong

This is the best 20 dollar bill Iv spent for the RAM.......
http://www.amazon.com/Autel-MaxiScan...3304482&sr=1-1

It reads and will delete, if you want it to, any trouble codes. Take the code it gives you and put it in Google, BAM you know whats wrong. Clearing a Tcode is not a fix, the truck computer will find the issue again unless you did the fix.

As for what may be wrong with yours, I dont know. Sounds like a fuel feed or air issue. Maybe EGR? That a $40, 4 bolt fix
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Old 04-06-2012, 05:10 PM
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Dudemanbrother Dudemanbrother is offline
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Obviously you need to take it to an autozone or whatever parts store you have near by and get the stored code pulled. That will help determine the problem for sure. Cold start and rough running with the troubles your describing actually sound like a bad battery. Pull the codes and you will have a much better idea.
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Old 04-07-2012, 12:49 AM
Tommycat Tommycat is offline
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Flashing CEL usually means that there is a danger of damage to the Catalytic converter. You may have knocked something loose. Check again to make sure you got your wiring right. Get yourself a code reader, or go to Autozone to have them read the codes for you.
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Old 05-02-2013, 11:15 AM
lindengauthier420 lindengauthier420 is offline
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Hey anyone know if its bad to leave the engine light on if its this code p-0420? It means o2 sensor or cats i think?
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Old 05-02-2013, 02:06 PM
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snrusnak snrusnak is offline
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A flashing check engine light is bad. You shouldn't drive the vehicle. You need to get the codes and post them here and we can help you.

P0420 means catalytic efficiency below threshold. Either one of the downstream O2 sensors is faulty, the connection or wiring is faulty, or the catalytic converter is faulty.
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Old 05-03-2013, 11:09 AM
lindengauthier420 lindengauthier420 is offline
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Ya the code i got was 0420. The guy i got off said that its because he put regular gas in it. He says i needed to run with 89 octane becasue of the emisson is that why its on?
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Old 05-03-2013, 02:54 PM
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snrusnak snrusnak is offline
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Quote:
Ya the code i got was 0420. The guy i got off said that its because he put regular gas in it. He says i needed to run with 89 octane becasue of the emisson is that why its on?
No that's not correct.

How many miles are on the truck? Any running issues at all? If it's running poorly it's probably a clogged/faulty catalytic converter. If it runs fine it's probably a bad sensor.
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Old 05-03-2013, 05:48 PM
lindengauthier420 lindengauthier420 is offline
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Question

Thanks for the reply. It has 168000km and it runs fine with the engine light on. How do i know of the o2 sensor is done and how much is a new one roughly?
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Old 05-03-2013, 05:55 PM
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What's a km?????

That's roughly 100,000 miles and that's a fair amount of mileage. It is possible the sensor is faulty. Also possible the cat is clogged.

If it's running fine I'd try the sensor. Although you don't really need to replace them if it is running ok and the light doesn't bother you too much. It's just an emissions thing, it doesn't effect the truck in any other way. Now, if the truck starts running poorly it could be a clogged cat.

I'd guess a new downstream sensor is ~$50 to $100.
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