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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
(4342 views)
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CAR SHAKES WHEN I ACCELLERATE TO 40 MPH
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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.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 19, 2016, 3:35 PM
Post #2 of 8
(4334 views)
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Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH
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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
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 19, 2016, 5:45 PM
Post #3 of 8
(4331 views)
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Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH
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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.
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maxchr66
New User
Feb 14, 2017, 11:31 AM
Post #4 of 8
(1411 views)
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Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH
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MORE THAN LIKELY YOU HAVE A TRANSMISSION PROBLEM. CHECK THE FLUID . IF IT LOOKS BURNT, TRY CHANGING THE FLUID & FILTER.
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 14, 2017, 11:38 AM
Post #5 of 8
(1407 views)
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Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH
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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.
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Double J
Veteran
/ Moderator
Feb 14, 2017, 12:18 PM
Post #6 of 8
(1398 views)
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Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH
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OK, Why is this guy answering his own question from last August?
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Hammer Time
Ultimate Carjunky
/ Moderator
Feb 14, 2017, 12:58 PM
Post #7 of 8
(1392 views)
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Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH
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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.
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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.
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Double J
Veteran
/ Moderator
Feb 14, 2017, 1:09 PM
Post #8 of 8
(1388 views)
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Re: CAR SHAKES WHEN I ACCELLERATE TO 40 MPH
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I talk to myself too but that's because I look around the room first to see my choices.
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