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05 LGT Vibration in Drive or Reverse, have some thoughts, HELP


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LGT 2005, 149K miles

 

EJ257 shortblock at 147K

New LCA bushings,

New front CV axles (cardone)

New brakes

Tranny oil flush only drain and fill

 

My problem

 

D-When cold, really bad vibration when in drive while brakes pressed

D-When hot, still vibrates, but much less

 

N- no vibration what so ever

 

R - same as D when cold a lot of vibration

P- no vibration what so ever

In D or R with no accelerator pressed car moves forward or reverse, and i have to hold brakes firmly, i know it is suppose to move, but there should be minimum brake work to stop it.

I recall having issues with gas pedal, i'we cleaned contacts back than, and no more engine codes, but with my romraider logger it shows, that without pressing gas pedal throttle plate opens to 7-8 %.

 

 

I am thinking 3 possible causes:

 

1. CV Axles not beeing original, which may cause vibrations

2. Something loose or going out, (mounts, clutch in tranny etc)

3. My gas pedal assembly needs to be replaced/adjusted because it always stays at 7-8% at idle or in gear.

 

Thank you guys for all input, i need to get this fixed, it drives me nuts.

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1.=- vibration from the drivetrain, when engaged

2- at idle there is no vibration

3 my revs actually stay at 1000-1100 even when car is warmed up, don't know why

4. yes cabin shakes

5. At idle i can feel some rpm play 1000 to 1050 and back, sounds normal, but not sure

\

 

Hope it helps

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most likely what was said above... bad axel....

 

i replaced both of my front axels , only i got mine from napa ( buddy is a mananger there )..

 

i havnt had one problem with them yet and its been 5 months

 

Is there any other way to confirm they are bad axles?

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1.=- vibration from the drivetrain, when engaged

2- at idle there is no vibration

3 my revs actually stay at 1000-1100 even when car is warmed up, don't know why

4. yes cabin shakes

5. At idle i can feel some rpm play 1000 to 1050 and back, sounds normal, but not sure

\

 

Hope it helps

 

This sounds a lot like the idle problem I'm having.

 

I can feel a slight 'lump' when not in D or R. Once in either gear I would get an RPM drop until the motor recovers. While in gear and stopped, it feels like a miss fire and with the A/C on the cabin will give a shake when the compressor kicks in.

 

I'm not sure about my axles but tomorrow I'm having it put up on a lift to check the following:

 

- compression/leak down

- motor mounts

- axles

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A new axle from the auto parts store is like $80.00

 

 

OP you say you only get the vib when the car is moving. Some one else here recently is may be having propeller shaft issues.

305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD).  CHECK your oil, these cars use it.

 

Engine Build - Click Here

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A new axle from the auto parts store is like $80.00

 

 

OP you say you only get the vib when the car is moving. Some one else here recently is may be having propeller shaft issues.

 

Well, i got 2 brand new axles from auto parts store, now i have vibration

 

And i have vibration not while moving, but when in D or R with brakes pressed, adter i release brakes and start moving like 0.5 mph noise is gone.

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What is your idle speed/rpm ?

 

Is it to low ?

 

I guees you have checked the fluid level in the tranny ?

 

Have you had the tranny fluid changed when it was called for ?

 

 

ClimberD may be your next bet, he's good with 5eat's, I'm just guessing.

305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD).  CHECK your oil, these cars use it.

 

Engine Build - Click Here

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Well, i got 2 brand new axles from auto parts store, now i have vibration

 

And i have vibration not while moving, but when in D or R with brakes pressed, adter i release brakes and start moving like 0.5 mph noise is gone.

 

time to see a mech about this...

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