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Help! What would you do next? Hemi misfire and low power
I think I read a similar post about that same issue. I am going to try to drive around today with the t/h mode on and see what happens. I want to do a couple more runs once it's warm to see if it only throws a code when I'm under heavy load now. Because starting, idling, and easily driving it...- horbizzle
- Post #34
- Forum: Engine & Performance
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Help! What would you do next? Hemi misfire and low power
Update! Replaced the battery today. It’s like the truck immediately came back to life… almost. It definitely runs better and has ran all day today without the extreme list of random codes. I believe the whirring/whistling is from the exhaust because it seemed to get quieter now when I got the...- horbizzle
- Post #27
- Forum: Engine & Performance
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Help! What would you do next? Hemi misfire and low power
You know thats a good point! The battery is going on 4 years old now, and about a month ago I accidentally ran it dead while in the driveway. I boosted it to start and even threw a charger on it overnight, but I have noticed a little bit of a lag and sluggish starting. Plus I live in North...- horbizzle
- Post #19
- Forum: Engine & Performance
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Help! What would you do next? Hemi misfire and low power
So... A whole new bunch of info. Truck ran sluggish but no codes for a 10 mile round trip this morning. But then later in the afternoon I tried to go 2 miles to the store and it died in the street when I came to a stop at a light. Codes galore! Standard P0300 But now... P0306 (Cylinder 6...- horbizzle
- Post #16
- Forum: Engine & Performance
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Help! What would you do next? Hemi misfire and low power
Hahaha. Sorry. I meant without the airbox and intake tube connected to the throttle body. Just to see if there was anything clogging the airflow. Also without the air cleaner as well. I do have a new backup air filter but the one I had in there wasn’t very old.- horbizzle
- Post #11
- Forum: Engine & Performance
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Help! What would you do next? Hemi misfire and low power
I'll add a PVC to the list! Might just change ALL the sensors while I'm at it. Probably some of them bad or about to go bad after 265k miles. I ran it without an intake after I did the plugs and coils and it didn't change anything. I'll have to see if I can get the gf to man the throttle while...- horbizzle
- Post #7
- Forum: Engine & Performance
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Help! What would you do next? Hemi misfire and low power
I’m 100% sure of the codes. It throws a constant P0300 when it’s acting up. But the few times it threw an actual code was a P0303 before changing plugs and coil packs, and then a P0305 after. But today I can’t seem to get anything other than a P0300. However, this is the weird part, and why I...- horbizzle
- Post #3
- Forum: Engine & Performance
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Help! What would you do next? Hemi misfire and low power
2009 1500 hemi 5.7 with 265,000 mi on it. Yes I have the hemi tick. Yes I have a bit of an exhaust leak. Had those for years with the engine running fantastic. Those are not the problems right now. Last week the truck started lacking in power. Then when it was cold, about two blocks from home...- horbizzle
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- 5.7 hemi injectors misfire plugs
- Replies: 42
- Forum: Engine & Performance
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