Having misfires. What's going on? - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 4 (permalink) Old 08-23-2012, 10:33 PM Thread Starter
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Having misfires. What's going on?

In the morning or when the engine is cold I'm having misfires. This started 3 weeks ago and I changed my plugs 5 months ago with the timing belt. When I crank up my trep it will idle bad but when I step on the gas it will run fine for a min when idling then start running bad. It smokes alot also. When it's at normal operating temp it rans fine and the smoking stops. I pulled some codes that which was P0300, p0303, p0420, and p0430. Think my O2 sensors are causing misfires?
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post #2 of 4 (permalink) Old 08-23-2012, 10:37 PM
That rhythm is INFECTIOUS.

 
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What kind of plugs did you put in? Please say NGK or Champion Plats....
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post #3 of 4 (permalink) Old 08-23-2012, 11:07 PM
get off my lawn

 
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id suspect,, just from what you wrote,, leaky fuel injectors,,, smoking upon starting,, black smoke, is raw fuel,, it will also throw the 2 converter codes you have, Po 420-430,
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post #4 of 4 (permalink) Old 08-24-2012, 04:22 PM Thread Starter
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I'm using platinum NGKs. Can't find Champions anywhere anymore. That leaking fuel injector might be why I'm not getting good gas mileage now. But will it cause a misfire and just stop when the engine is warm?
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