Weird vibration

[The Roadie]

I've read about folks who put their coils on slightly tilted and the spring didn't clip onto the plug top properly. Or a dirty coil boot in the same area on top of the plug allowed high voltage arcing that bypassed the plug.

[KingBird]

I agree, I'm curious to know if the CEL is on or flashing under acceleration.

I'd also like to know if increasing the fuel level alleviates the problem.

When my fuel pump disassembled itself inside the tank, our problems started with a slight hesitation while accelerating, then progressed to a rough idle in gear, and finally one night the only way I could get home was by pumping the pedal rhythmically when taking off from a dead stop until the vehicle reached 15 mph or so. It was a LONG four miles.

If filling your tank makes the problem better (not completely fixed though) then you know the problem lies in the tank.

[02_chevy]

That's was my first thought but I'm not throwing any codes and no flashing cel, I didn't think about it but it could be I over tighten the plugs and cracked them bc I'm notorious for doing that on my jet skis lol ill pull the plugs and see what's goin on with them.

I appreciate the feedback from everyone!!!


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[02_chevy]

So I took out each spark plug and checked them, no cracks or anything. I put them all back in with the correct torque spec and it helped with the rough idle but Im still getting a bad vibration, which happens at 3000 rpms and above.

Could it be change be the fan clutch?


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[KingBird]

Is it the same sitting still or only while driving?

[02_chevy]

Is it the same sitting still or only while driving?

only when driving.

What about a clogged cat? maybe

[KingBird]

Possible, but usually you'll get a code if so, I really don't remember if mine had that vibration when the cat clogged. Someone seems to have gutted mine since then, but that's illegal...

[02_chevy]

I was doing some thinking and i came up with this. I just replaced my waterpump and i was wondering if the vibration could be coming from a wobbling fan or something. idk just throwing out scenarios. There was a vibration before i did the waterpump but it wasnt anywhere near as bad

[02_chevy]

Possible, but usually you'll get a code if so, I really don't remember if mine had that vibration when the cat clogged. Someone seems to have gutted mine since then, but that's illegal...

I used to have a friend that could tune the cat code out if i hollowed it out but hes not around anymore otherwise i would have done that already. The truck hasnt thrown any codes and the cel hasnt flashed like it usually would with a misfire.

[KingBird]

You could pull the belt and turn the accessories/wobble the pulleys by hand. That would let you know of any bad bearings. Look for scraping on the inside of the fan shroud as well, maybe the fan is coming in contact with it.

[Trail X]

The fan shouldN'T change how it reacts between being in gear and being in neutral, nor should anything on the belt. Unless I misunderstood him. Is it only 3000+ rpms and only when in gear and in motion? Does it do it in every gear, only one gear, does it remain when at 3000 rpms and not accellerating? Does it only happen when at 3000 rpms and accellerating hard? You said it presents itself in the steering wheel? Is the steering wheel turning left to right with the vibrations? Or is it more of a general high speed vibration that just happens to be felt in the wheel?

[02_chevy]

The fan should change how it reacts between being in gear and being in neutral, nor should anything on the belt. Unless I misunderstood him. Is it only 3000+ rpms and only when in gear and in motion? Does it do it in every gear, only one gear, does it remain when at 3000 rpms and not accellerating? Does it only happen when at 3000 rpms and accellerating hard? You said it presents itself in the steering wheel? Is the steering wheel turning left to right with the vibrations? Or is it more of a general high speed vibration that just happens to be felt in the wheel?

It happens in every gear and presents itself around 3000 rpms and continues to accelerate but the vibration gets worse as I accelerate. The wheel doesn't pull at all regaurdless of speed I just had an alignment done about a month ago. If I punch it from a dead stop I can feel it almost instantly but it still doesn't get bad until about 3000 rpms. I wouldn't say its a high speed vibration either bc if I hold it in first gear and rev it to 3500 the vibration is there.
What makes me think its engine related is when I take my foot off the gas while cruising the vibration goes away.

I checked all the plugs and theyre the acdelco 41-103 plugs and I torqued them all down correctly as well as the coils. Idk where else to go from here -_____-

[KingBird]

My company vehicle is a 2004 HD Silverado. Recently I had the radiator replaced. Afterward, it would make a noticeable rubbing noise (sounded like a Cessna) only while driving down the road. It absolutely would NOT do it sitting still. It was the fan rubbing on the shroud. I had to wait until it actually scored the shroud to find out what the noise was.

I'm just trying to help.

[02_chevy]

My company vehicle is a 2004 HD Silverado. Recently I had the radiator replaced. Afterward, it would make a noticeable rubbing noise (sounded like a Cessna) only while driving down the road. It absolutely would NOT do it sitting still. It was the fan rubbing on the shroud. I had to wait until it actually scored the shroud to find out what the noise was.

I'm just trying to help.

I gotcha, the reason I don't think its the fan is bc the vibration was happening before I ever touched the fan. I do appricate the help though!

[02_chevy]

I checked the fan and its not rubbing on anything, i also cleaned the tb and all the did was //// up my trucks rpms, i checked my camsensor to see if it was loose and it wasnt ... this is getting retarded im at the point of setting it on fire ... Its not suspension and it only happens in gear.

Transmission? engine? idk im lost at this point

[KingBird]

I know that feeling, bro. So far on mine I've had to replace the fuel pump, spark plugs, three coils, gut the cat, upstream O2 sensor, and the valve timing solenoid valve or whatever it's called. Damn thing runs like a top now...

[02_chevy]

Thowing this in there, the vibration ONLY happens when im on the gas. if I keep it in gear and bring it above 3000 its there and gets worse the higher I go but the second I take my foot off the gas it goes away. same while im cruising where there is a small vibration but goes away if I take my foot off the gas

[navigator]

so only in gear
only while accelerating
only noticeable above 3k rpms.

what if you hold the brake and get above 3k rpm in drive, do you get it then?

[Wahugg]

What if you keep the gear selector in 1st and allow the engine to engine brake above 3000rpm?

[02_chevy]

What do you mean by "brake above 3000rpm"?


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