Car shakes during medium load (driving between 40-50 mph)

WAXANDGO

MEMBER
2007 NISSAN SENTRA
2.0L
4 CYL
2WD
AUTOMATIC
72,000 MILES

While driving between 40-50 mph and I step on the gas to accelerate (to overtake another car) the car shakes but continues driving fine after hard acceleration is over. The car idles fine and gets good gas mileage as usual.

Wednesday, May 28th, 2014 AT 5:35 PM

6 Replies

JACOBANDNICKOLAS

MECHANIC
108,133 POSTS

Has the check engine light come on? When it shakes, does it still accelerate normally?

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Wednesday, May 28th, 2014 AT 6:16 PM

WAXANDGO

MEMBER
23 POSTS

Check engine light does not come on at any time. And when the car shakes it does accelerate through the the shaking. I took it out a little while ago and drove it hard! From 30 mph thru 60 mph numerous times. Now the shaking is minimal but still present.

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Wednesday, May 28th, 2014 AT 7:14 PM

JACOBANDNICKOLAS

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108,133 POSTS

Without the check engine light, it becomes a guessing game. Since it isn't coming on, that tells me there are no misfires or sensor issues. Could the shaking be coming from the transmission? Is the fluid clean and full?

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Thursday, May 29th, 2014 AT 6:53 PM

WAXANDGO

MEMBER
23 POSTS

I shared that concern as well, Checked it. Full & no burnt smell. Car has 77k miles. Would a faulty injector or coil on plug be so consistent without a check engine light coming on? And why has the shaking reduced so much after the hard runs? If I remove the air intake (to multimeter test the coil on plug) has anyone gotten away without replacing the gasket? Too many questions, not enough $ to replace as a go! Thanks for ur input.

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Friday, May 30th, 2014 AT 2:04 AM

JACOBANDNICKOLAS

MECHANIC
108,133 POSTS

If everything is working correctly, and they usually do, a misfire, coil, sensor, bad plug. Would set the check engine light. That is the part that points me in the direction of the transmission. Now, why it got better after running it hard is the next question. Just for curiosity, have you tried running a fuel injector cleaner through it?