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Hicham

Hicham 7/20/2018

2010 Jeep Grand Cherokee Laredo 6 Cyl 3.70L

Transmissions & Drivetrains

Vibration when i press the gas pedal (6 Cyl 3.7L)

I get a vibration when i press the gas pedal. When the vehicle is stationary there is no vibration. If i'm not pressing on the gas pedal there is no vibration. The vibration happens on all the gears from 1st to 5th. It seems like it's related to the torque applied. The frequency depends on the gear (gets higher with higher gears). The displacement of the vibration gets lower with higher gears. I only have a check engine light related to the catalytic converter. Looking for adivise, thanks in advance. The mileage on the vehicle is 135000.

3 Answers


Jimm

Jimm 7/24/2018

First question - what are the specific fault codes, or fault code (check engine light)?

The exact cause of the vibration may be several different issues; engine ignition misfiring, worn spark plugs, clogged intake air filter, dirty air intake, poor quality fuel - to list only a few.

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Hicham

Hicham 7/25/2018

If it is a misfire caused by sparkplugs, does it appear on the scanner?? is there a code for it?? The same question for coils connected to the sparkplugs.

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Hicham

Teddy B 7/25/2018

Most of the time,but not in all cases,you may get a cylinder misfire count on
Professional Scan Tool Software only,not likely at the parts store on a code reader.
There is no reason for spark plugs to be in the motor for so many years, as to cause
a misfire & codes or data by it'self, does not tell you what is wrong or what to do.
Coils can act up in many ways & there are many ways of testing the ignition system.
The answer is you need to component test to find problems.

Jimm

Jimm 7/25/2018

Teddy B is correct; there may or may not be any code(s) to indicate a misfire condition.

The best approach is to test to determine the cause of the issues with proper diagnosis - not simply to throw money and parts / guesswork at the problem.

More common causes of a misfire could be a bad coil, worn plug or plugged / faulty fuel injector. However, many 3.7 and 4.7 engines are having problems with the rocker arm falling out of place.

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Jimm

Teddy B 7/25/2018

Google:Dodge Rocker Arm Issues --Lots of You Tube Videos --Jimm was referring to.

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