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CAR SHAKES WHEN I ACCELLERATE TO 40 MPH


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maxchr66
New User

Aug 19, 2016, 1:39 PM

Post #1 of 8 (3173 views)
CAR SHAKES WHEN I ACCELLERATE TO 40 MPH Sign In

1999 MITSUBISHI DIAMANTE 215K+ MILES.6 CYL 3.5L ENGINE, AUTO 4 SPEED TRANS. WHEN I ACCELLERATE SLOWLY, AT 40 MPH MY ENGINE/TRANSMISSION SHAKES BAD. MOTOR MOUNTS LOOK GOOD/ NO OBVIOUS DAMAGE. PUT IT ON JACK STANDS. WHEELS SEEM TIGHT, STEERING NOT LOOSE, NO PLAY ON C V JOINTS. PROBLEM NOT SO BAD IF I ACCELLERATE HARD. LET OFF GAS, SHAKING STOPS. ENGINE RUNS A LITTLE ROUGH AT IDLE SPEED, SMOOTHES OUT WHEN ACCEL PEDAL APPLIED (EVEN SLIGHTLY). I'm MORE OF AN OLD SCHOOL MECHANIC. NOT MUCH EXPERIENCE W/ FRONT WHEEL DRIVE.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 19, 2016, 3:35 PM

Post #2 of 8 (3165 views)
Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH Sign In

That's enough miles for anything. If not running smooth at idle it's probably not smooth accelerating either so you feel it. Motor mounts could make it feel worse. Check those and if bad it can allow exhaust parts to touch body and feel horrible.
CV joints don't check for "play" as if they had any they'd bust right away - they crackle usually on turns no like checking a U-Joint by hand.


Any engine even 1999 that isn't running well should be setting codes so get those read and post #s. It can store codes even if an light is not on and about has to have one or more to assist,


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 19, 2016, 5:45 PM

Post #3 of 8 (3162 views)
Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH Sign In

Assuming this isn't an engine misfire under load, inner C/V joints binding will give you that exact symptom.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



maxchr66
New User

Feb 14, 2017, 11:31 AM

Post #4 of 8 (242 views)
Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH Sign In

MORE THAN LIKELY YOU HAVE A TRANSMISSION PROBLEM. CHECK THE FLUID . IF IT LOOKS BURNT, TRY CHANGING THE FLUID & FILTER.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Feb 14, 2017, 11:38 AM

Post #5 of 8 (238 views)
Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH Sign In

Check engine light on or flashing? If so, scan for codes and write down the numbers.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Double J
Veteran / Moderator
Double J profile image

Feb 14, 2017, 12:18 PM

Post #6 of 8 (229 views)
Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH Sign In

OK, Why is this guy answering his own question from last August?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 14, 2017, 12:58 PM

Post #7 of 8 (223 views)
Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH Sign In

Yeah, and he was dumb enough to do it in all caps too.

He talks to himself so this is just an extension of that.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Double J
Veteran / Moderator
Double J profile image

Feb 14, 2017, 1:09 PM

Post #8 of 8 (219 views)
Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH Sign In

I talk to myself too but that's because I look around the room first to see my choices.






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