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Apr 21, 2010 | 08:35 AM

reddot

Thread Starter

Driver School Candidate

Joined: Aug 2009

Posts: 8

Likes: 0

From: NY

need help

When I'm driving around 50 to 55 on highway my car starts shaking or knocking. Will this be the transmission issue, and is it fixable? The car has approximately 140,000 miles. So I'm assuming the transmission.

Thanks

Apr 21, 2010 | 09:34 AM

dkpnkc

Rookie

Joined: Dec 2008

Posts: 84

Likes: 6

From: MO

Personally the first thing I'd check is tires. I had minor shaking that rebalancing/rotation only fixed for a short period of time. Ended up getting new tires and it solved the problem.

Apr 21, 2010 | 11:27 AM

AlexusAnja

Lead Lap

Joined: Mar 2006

Posts: 4,189

Likes: 16

From: NY/NJ

Elvis

Quote:

Originally Posted by reddot

Maybe you have Elvis under your hood...

But seriously, shaking at a particular MPH is usually associated with tires and either misaligned or out of balance, while knocking could be from using regular gas perhaps?

Unless the RPM is also fluctuating and going nutty during this MPH, I'd almost say it's NOT a transmission problem.

JMHO.

Apr 21, 2010 | 12:09 PM

hypervish

Lexus Test Driver

Joined: Aug 2009

Posts: 5,723

Likes: 114

From: NJ

As long as the RPM's aren't surging and changing, it's safe to say that it's not a transmission problem. I do agree with the others first thing to do is check the tires out. Does it always knock when the car starts shaking? Check the lug nuts to make sure they are tight...I've come across cars that I could take the lug nut off by hand.

Apr 21, 2010 | 12:53 PM

reddot

Thread Starter

Driver School Candidate

Joined: Aug 2009

Posts: 8

Likes: 0

From: NY

When its on DRIVE not moving complete stop the RPM tends to move up and down. Which is an issue. I will go get the tire checked out this weekend. I had the same problem during the summer, and I got it fixed so I guess it is the same issue dkpnkc.

Thanks all for your help, more reply will be great!!

Thanks

Apr 21, 2010 | 01:31 PM

hypervish

Lexus Test Driver

Joined: Aug 2009

Posts: 5,723

Likes: 114

From: NJ

If the RPM's move when idling in drive. You should clean out the MAF, throttle body and IACV. All of these can be done by the DIY's on this site. You probably don't need to clean all of these, but cleaning all of them won't hurt and it'll only benefit with some better mpg's and performance.

Apr 21, 2010 | 02:16 PM

dkpnkc

Rookie

Joined: Dec 2008

Posts: 84

Likes: 6

From: MO

Quote:

Originally Posted by hypervish

I did this last night & it's well worth the 30-45 minutes. Easy to do w/ the great instructions on this site - and coming from me means it's really easy