ShadowsPapa
Well-Known Member
- First Name
- Bill
- Joined
- Oct 12, 2019
- Threads
- 180
- Messages
- 29,634
- Reaction score
- 35,268
- Location
- Runnells, Iowa
- Vehicle(s)
- '22 JTO, '23 JLU, '82 SX4, '73 P. Cardin Javelin
- Occupation
- Retired auto mechanic, frmr gov't ntwrk security admin
- Vehicle Showcase
- 3
I have seen that on mine, but only a couple of times. I rarely feather the throttle, except when parking my car hauler, then I have to be very careful and deliberate as it's close quarters and tight turns back there.Fluttering is vague description, but familiar. There is. Ot much the dealership can do besides reset the adaptive learning and recalibrate the throttle, or possibly replace it. The engine is running fine, the throttle can get twitchy AR over active if you do a fair bit of low speed driving. It unfortunately is how it is designed. The model does not deal with small throttle inputs over time well. If Hou wNt to verify this is what is happening sit in park idling and try to slowly Rev the engine from idle to 3000 rpm in 200 rpm increments. If it keeps falling in rpm even though you have not let off the pedal, or it oscillates up and down, then you throttle model has learned itself into an unstable behavior at small throttle openings. This creates a flutter effect at load.
Be careful with zinc........... too much can mess with things, and with good quality high PSI oils, it's really not needed except for old-skool high lift cams with heavy spring pressures.Mine is insanely quiet now compared to before. I also used the JSCAN to clean cam phasers a few times after my camshaft swap. It seems to keep getting quieter as time goes on. Im using the Royal Purple 5w-30 with zinc added. That was what was on the shelf at the time, but seems to be doing good for now.
I run standard modern oils even in my car built for racing, and my slightly built 4.0 with Comp xtreme 4x4 cam. No additives, no high zddp numbers. The old farts still swear by needing massive zddp numbers, but they won't be dragged into the 2020s even kicking and screaming no matter the numbers toss at them. LOL
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