This topic contains 4 replies, has 2 voices, and was last updated by Michael Lambert 5 months, 2 weeks ago.
2014 300c 5.7l hemi, AWD
The RPM needle flicks, irregular pattern, it’ll flick about 30 rpm up, stay up for about 1/4 of a second then drop down quick 30 is rpm, tiny little flick. It does this in any gear, at 2000rpm, 4000rpm, idle, all the time.
No check engine lights, 2 garages found nothing, I thought whatever but then it became a problem.
Now when the car is under load, accelerating or going up a hill, that little flick evolves into a 200-300 rpm surge and when towing a little utility trailer with an ATV the rpm flick goes up to 500rpms up and down, making everything make noise as the tranny and engine surge.
I found out about “Alternate ripple” that can cause some wild issues. I used a nice OBD2 tool and observed the voltage output, it fluctuates a lot between 14.3 to 14.9 volts, I’d show a picture of the graph but I can’t post a picture.
Is this normal for an alternator?
I got a new battery today, checked the grounds around the areas I could and they had 1-6 ohms, fluid filter change on tranny, the fuel trim fluctuates with that rpm fluctuation so if it is an alternator ripple than I can see it causing the injectors and spark plugs to “ripple” too when firing off so quickly.
- This topic was modified 2 years, 1 month ago by Michael Lambert.
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