vibration in the gas pedal at 60 mph

[Henryt]

I bought a 1990 240sx like a year in a half ago. When i was taking a look at it the seller didn't let me drive it. He took me for a spin i found no problem because i had a 1992 an the clutch sliped on that one.anyway i bought the 1990 an when i took it on the interstate it was smooth until 60 mph and there was a vibration on the gas pedal. my guess is a lower control arm does anyone know what might be wrong

[Alfador]

It could be as simple as balding or unevenly worn tire, or a poorly balanced wheel. It could also be as complicated as like you said a bent arm or something. Bottom line, check the simple possibilities first.

[Henryt]

that would cause a shake on the steering wheel but i couldn't get an alighment on my rear driver side

[180fan]

only thing the gas pedal's attached to is the throttle cable which goes to your throttle body. pop the hood at idle and see if your engine's shaking like a salt shaker

[Henryt]

lol no my car does not run like crap it's a vibration in the gas pedal at 70mph which kills gas i might be right

[ricebike]

that would cause a shake on the steering wheel but i couldn't get an alighment on my rear driver side

??? what's the cause of that? a bent suspension component?

[180fan]

guessing something with the tie rods?

[john_t]

Alright, I had an almost EXACT problem in my 240 a year ago, and it took a little work to find (it turned out for me that the vibration wasn't related to the suspension). I thought it was a tie rod or crappy bushings or something, replaced them (it needed 'em anyway, I used to drive it like I stole it). well as it turned out, somewhere along the way I threw the driveshaft balancing weight, which is really no more than a small piece of steel welded somewhere to your driveshaft IF it needed it. No offense guys, but not all driveshafts leave the factory perfectly balanced, no matter how well turned they are, and mine was secondhand. I guess it wasn't welded on that well to begin with. But at 72 mph it caused a harmonic vibration that in the end, tore up my motor mounts and the seals in my transmission. LUCKILY the motor bearings and seals were OK (found that out during the rebuild 20k later). Ironically, the only evidence I EVER felt from this was a steady vibration in the gas pedal, probably from the driveline getting the piss shaken out of it.

That's just my story, but it's an easy check. If this is a recent development, I'd say jack up the car and look for fresh metal on the driveshaft. It'll stick out like a sore thumb if it's there. If not, I hope it's some simple non-detrimental problem. I'd take a hard look at this though, vibrations destroy good parts, and break bad ones.

later

[Henryt]

my apoligize team i haven't been on lately i've findly found the problem i figured it was it it was the lower control arm that was bent also i got some brand new tires but the only way that i can tell is see how long these tires last. if it last long than i fixed it