Car Shudders While Accelerating or Climbing Hills

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Car Shudders While Accelerating or Climbing Hills - Only at Highway Speed...

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Car Shudders While Accelerating or Climbing Hills - Onl... - 12/20/2006 9:29:46 AM

SDRaymond

Posts: 7
Joined: 8/31/2004
From: Wisconsin
Status: offline

This is my first post, so be gentle

... I have a 2004 Chrysler Sebring Coupe, (I know, I know

) which was designed and built by Mitsubishi for Chrysler. Anyway, it has the Mitsu 6G72 3.0L engine and Mitsu F4A51 Transmission. I'm experiencing a shudder when climbing hills, even if moderate, and when accelerating, but this only happens at highway speeds and while accelerating to highway speed. At lower speeds and from a standing start, acceleration is completely normal with no shudder whatsoever

Here's what's been done so far:

New plugs - NGK Iridium
Had the Chrysler garage check for engine and transmission codes (intermittent MAF code only)
Rotated tires
Replaced transmission fluid - Mitsu SPIII
Cleaned throttle body
Used injector cleaner - Techron
New air filter

One "oddity" that I did notice while changing the plugs was dark "stains" between the intake ports on the gasket, intake plenum, and intake manifold. I don't know if this indicates leakage between the port or not? I did clean the surfaces of all three items thoroughly before reassembly.

Any ideas?

Thanks in advance!

Scott

Post #: 1

RE: Car Shudders While Accelerating or Climbing Hills -... - 12/20/2006 12:10:17 PM

TheEngineer

Posts: 10733
Joined: 1/25/2006
Status: offline

tires need to be balanced maybe. Does it do it when your on the highway at a constant speed or only when accelerating?

_____________________________

quote:

ORIGINAL: pilsenblue
Even tho My car looks great It will never be fast. Kinda like a hot girl that dosent give it up

(in reply to SDRaymond)

Post #: 2

RE: Car Shudders While Accelerating or Climbing Hills -... - 12/20/2006 12:20:38 PM

SDRaymond

Posts: 7
Joined: 8/31/2004
From: Wisconsin
Status: offline

Only when accelerating or climbing a hill...

(in reply to TheEngineer)

Post #: 3

RE: Car Shudders While Accelerating or Climbing Hills -... - 12/20/2006 6:03:47 PM

Manybrews

Posts: 765
Joined: 5/23/2003
From: United States
Status: offline

its a shuddering torque converter clutch.
you need to have the transaxle FLUSHED COMPLETELY, using ONLY mitsu trans fluid. Nothing else should be used.

(in reply to SDRaymond)

Post #: 4

RE: Car Shudders While Accelerating or Climbing Hills -... - 12/20/2006 8:18:11 PM

SDRaymond

Posts: 7
Joined: 8/31/2004
From: Wisconsin
Status: offline

I've already flushed the transmission with 13 qts of Mitsubishi SPIII ATF, no change... However, I was looking things over this evening and discovered that the lower motor mount, which transfers the torque from the engine to the frame, has a huge rip in it. Could this be the cause of the problem?

Thanks!

(in reply to Manybrews)

Post #: 5

RE: Car Shudders While Accelerating or Climbing Hills -... - 12/20/2006 10:23:27 PM

SDRaymond

Posts: 7
Joined: 8/31/2004
From: Wisconsin
Status: offline

BTW, I also had the wheels balanced today, no change...

Does the Transaxle have to be power flushed or is a simple fluid replacement (following recommended procedures of course) adequate?

(in reply to SDRaymond)

Post #: 6

RE: Car Shudders While Accelerating or Climbing Hills -... - 12/21/2006 4:15:33 PM

Manybrews

Posts: 765
Joined: 5/23/2003
From: United States
Status: offline

power flushed.

it really sounds like a torque converter shudder. Does this condition happen immeadiately after a cold start, or does it take awhile? I ask because the torque converter clutch doesnt engage until the trans reaches about 140 degrees, so the shuddering issue may not be present until 5-10 minutes into your drive cycle.

how many miles are on your car?
Also, if it is infact torque converter shudder, a total fluid change usually takes care of it. But in a few percent of the situations a new converter MAY be needed (although I have yet to see that actually happen).
heres a small sample of the TSB about it.

(in reply to SDRaymond)

Post #: 7

RE: Car Shudders While Accelerating or Climbing Hills -... - 12/21/2006 7:42:36 PM

silvercoupe97

Posts: 3408
Joined: 11/10/2006
Status: offline

^^ I would say that, that about covers it, lol.

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Thanks,
John

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Post #: 8

RE: Car Shudders While Accelerating or Climbing Hills -... - 12/21/2006 11:25:29 PM

SDRaymond

Posts: 7
Joined: 8/31/2004
From: Wisconsin
Status: offline

Manybrews, thanks for the information!!! The problem occurs only when the transaxle warms up. The car has ~128,000 (nearly all highway, 70mph+) miles on it. I did a complete fluid change earlier this week (with Mitsubishi SPIII) with no change to the problem.

As I stated earlier, this is essentially a Mitsubishi with a Chrysler logo on it. I had the fluid replaced by the dealership at 50,000 and 100,000 miles. I'm starting to think that they may have installed Chrysler ATF +4 instead the required SPIII. Bottom line, I'm going to take it to a Mitsubishi dealership next week to have the Transaxle completely flushed and fresh SPIII installed (darn, I hate to dump $85 worth ATF I just installed). How much does this typically cost?

Thanks again.

(in reply to silvercoupe97)

Post #: 9

RE: Car Shudders While Accelerating or Climbing Hills -... - 12/22/2006 8:07:06 PM

Manybrews

Posts: 765
Joined: 5/23/2003
From: United States
Status: offline

quote:

ORIGINAL: SDRaymond

Manybrews, thanks for the information!!! The problem occurs only when the transaxle warms up. The car has ~128,000 (nearly all highway, 70mph+) miles on it. I did a complete fluid change earlier this week (with Mitsubishi SPIII) with no change to the problem.

As I stated earlier, this is essentially a Mitsubishi with a Chrysler logo on it. I had the fluid replaced by the dealership at 50,000 and 100,000 miles. I'm starting to think that they may have installed Chrysler ATF +4 instead the required SPIII. Bottom line, I'm going to take it to a Mitsubishi dealership next week to have the Transaxle completely flushed and fresh SPIII installed (darn, I hate to dump $85 worth ATF I just installed). How much does this typically cost?

Thanks again.

probably around 200 bucks.

I realize its a chrysler badged mitsu; Ive worked for mitsu for 15 years.

the milage on it almost assures it to be torque converter shudder.

(in reply to SDRaymond)

Post #: 10