Slight ticking/flutter noise under load

[4thgen57]

Hello everyone, I just started daily driving my 2020 classic 5.7 that I restored from salvage and ever since I bought it the truck has made a slight flutter like noise under load when accelerating. It’s very quiet, like so quiet that sometimes the road noise or even my music playing at 1/4 volume is louder than the noise. At idle it sounds like any other 5.7 hemi, just a little noisier. Like the same injector clatter that my other 2 5.7’s had but amplified a little. And the weirdest part is from the outside it sounds totally normal, and healthy. But from the inside at idle it’s like a tick, but the quietist and leaf defined tick you can imagine. And with rpm and load it becomes more defined and flutter like, almost like noisy injectors firing. The only thing I can think of is old and crappy gas, as the truck sat at the salvage lot since early October 23’ and is currently running on the same gas, and I’ve heard that bad gas can make the injectors noisier. Anybody have any clues as to what this is? Ps, I would record a video of it but I’m worried that it’s so quiet that my phone’s microphone wouldn’t even pick it up. Thanks everyone.

 

[jws123]

Possibly a small exhaust manifold leak check the bolts see if any of the bolts are broken they tend to warp and snap bolts also yea old ****** gas could make it Ping under load.

 

[mrack]

My 09 does that, but its got very warped manifolds and a hole in the firewall I keep forgetting to seal up so It’s a lot easier to hear.

 

[4thgen57]

UPDATE: So I took it to my friend’s house to get his opinion on it and when I took him for a drive he said he couldn’t hear it at all until he drove it on the driver’s side, so it’s coming from driver. We also determined that it’s not load related at all, it just exactly matches rpm. We also determined that it’s too quiet and not enough of a defined tick to be manifold bolts, and it’s higher pitched like injectors. My friend thinks that it’s either dirty injectors from sitting or it’s just a louder hemi and it’s been like that from day one. I’m still a little concerned since my 2014 didn’t do it and my dad’s 5th gen doesn’t do it. I took a video but it looks like I can’t upload it here.

 

[Jeepwalker]

Check the exh manifolds/studs. It's a chronic issue on these vehicles. The cure is to belt-sand your warped ones 'flat' or have a machine shop re-machine them. Buying new ones only means ...you bought yourself a couple yrs till THEY warp.

 

[CanuckRam1313]

perhaps dump in two bottles of Red Line SI-1 fuel system treatment on an empty tank and fill with premium fuel.

Drive it till empty and then refill with premium. Also, do an oil & filter change after the first tank of fuel that was treated.

Use a good quality 5W30 synthetic oil and a quality synthetic media oil filter, too.

 

[JHoward]

Yep, my 2017 HEMI made a little noise that also sounded like the HEMI tick for a couple of days after sitting six months under going "off the frame restoration" due to an accident ... it also ran a little"rough" on the first few cold start ups, but was fine when warm.

I added a bottle of Red Line SI-1 fuel treatment with a top off of top tier 91octain unethenol fuel and all is good again.

 

[4thgen57]

Ticking videoUPDATE: I uploaded a video of the noise with me driving and accelerating through gears. It almost sounds louder in the video than it does when driving it, but I did put my phone right up to the dash. Let me know if this helps with a possible diagnosis.

 

[4thgen57]

Yep, my 2017 HEMI made a little noise that also sounded like the HEMI tick for a couple of days after sitting six months under going "off the frame restoration" due to an accident ... it also ran a little"rough" on the first few cold start ups, but was fine when warm.

I added a bottle of Red Line SI-1 fuel treatment with a top off of top tier 91octain unethenol fuel and all is good again.

Mine makes the noise the exact same when it’s cold as it does when it’s warm, like no difference at all. It almost doesn’t sound like a tick in the video and much more like a flutter or even a hiss.

 

[JHoward]

Mine makes the noise the exact same when it’s cold as it does when it’s warm, like no difference at all. It almost doesn’t sound like a tick in the video and much more like a flutter or even a hiss.

Just throwing something out there ... when was the last time you tighten up your intake manifold bolts, not saying it'll solve your issue, but folks have re-tightened the bolts that work loose over time and because of other "things going on" and that seemed to have resolved their issues, ldk. ... can't hurt anything and wouldn't it marvelous if that did the trick?

 

[4thgen57]

Just something throwing out there ... when was the last time you tighten up your intake manifold bolts, not saying it'll solve your issue, but folks have re-tightened the bolts that work loose over time and because of other "things going on" and that seemed to have resolved their issues, ldk. ... can't anything and wouldn't it marvelous if that did the trick?

I’ve not tried that yet, I’ll give it a shot when I get home and I’ll keep you posted. I might check exhaust bolts while I’m at it.

 

[4thgen57]

So just for ***** I covered up the driver’s side vent while accelerating and the noise got dampened by like 2/3, and it seems like it’s coming directly from the vent area. Now I’m just more confused. Any clues?

 

[FullForceRam]

Could very well be coming from your hvac system. Do you have cabin air filter behind your glove box? Does the sound get any louder when the AC, Heater, Defrost is turned on? Could be a stuck actuator door in your hvac system.

 

[4thgen57]

Could very well be coming from your hvac system. Do you have cabin air filter behind your glove box? Does the sound get any louder when the AC, Heater, Defrost is turned on? Could be a stuck actuator door in your hvac system.

I just tried this, no different with ac, heat, or defrost turned on. It just always makes the noise exactly the same as long as it’s running.

 

[kayjo]

My 19 has a tick, only when cold. I am betting its exhaust. I have listened to dozens of videos and sounds. I am pretty sure some folks have replaced cams and lifters when it was not the problem, this includes dealers and shops.

Re flutter sounds. ( on throttle ) I have always considered this valve seat issues. This can be as minor as some carbon build up, to more valve issues.

Re hemi tick. I consider lifter tick to be more rapid rhythmic and sometimes intermittent. And very metal on metal tapping. ( high pitch like ratchet hitting socket not hollow or clanky ) Injector tick is clicky, not tappy. And finally, I feel that the exhaust tick, is more knocky , like a lower end rod. ( and much slower in cadence than lifter tick ) I finally put my ear to the exhaust manifold while still cool and knocking or ticking. And it was super loud and prominent coming through the exhaust. This would make no sense to me if lifter. ( you might hear it , but not like someone rapping on your exhaust, as mine sounds to me.) Its been that way for 30k , I have owned it, no change.

Oh, I do get the lifter bleed down on rare occasion. Dont shut down before engine has reached full operating temp. I get this if I move my truck to the garage when hail is expected and dont fully run it. I have aslo gotten it when engine is very hot, and didnt let it cool till where electric fan stopped, before shutting down. Sounds exactly like sewing machine on startup momentarily.