Question about 1999 Chevrolet Silverado 1500

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I have a 1998 Chevy silverado 1500 4X4. My problem is that I am getting a vibration at between 60 and 70 MPH on the freeway. I have a check engine light with a code defined as #3 missfire. I have changed the plugs, fuel pump and filter. I was also getting a metalic pinging but troubleshot that down to the driveline u-joints, changed them and the noise went away. So the driveline u-joints have been changed also (I understand that would set off the engine light). Maybe the engine light doesn't have anything to do with the viration and is a seperate issue. It doesn't make any difference if my foot is on the gas or I am off the pedal, I still get the vibration. It seems to be getting worse allthough it my just be my sanity is going away. Does any one have any suggestions as to what direction I should go? Any help would be greatly appreciated, Kevin

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  • krlok Oct 10, 2010

    Thanks techbuster,
    Great advise. I will give it a try and let you know what happens.
    I sure appreciate the help.
    Kevin

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  • Chevrolet Master
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Hi Kevin.

The misfire code is instead likely related to the shaking. When shaking is not coming from wheels/train section, but to transmission or engine troubles, then it is often causing misfire.

If car has automatic transmission, car shaking at determined speed is commonly caused by an early shifting transmission, in some case wheel problems, or an engine problem (less commonly) can cause the same problem.In this case the speed is a bit higher then usual, problems with early fifth gear ******* usually take place at 45 mph.

As said, common reasons for vibration that takes place only at a determined speed include transmission related problems, drive train and wheels related problems and engine related problems.

1 Automatic transmission related problems:
If the auto tranny is shifting too early, then the car will shake. In that case an experienced driver should be able to tell that the car is hesitating because the wrong gear kicked in. This kind of problem is commonly caused by a defective TPS(throttle position sensor). TPS is most common failure causing early or wrong shifting in a determined gear (5th if that happens at 45mph. 60 mph should be enough to hold 5th gear).There are less common transmissions related problems that can cause the same.The mechanic can easily test the TPS using a voltmeter while accelerating with car on the lift, and eventually replace the part.
Transmission failing will cause misfire most of the times.

Traction and wheels problems:
A mechanic driving the car can feel if problem is caused by wheel. Regarding tires, balancing problems can sometimes give more shaking at particular speed. Even if you think this is not the problem (and probably is not), tyre balancing and alignment is an inexpensive operation that should be done when you get this kind of problem.
In the driveshaft, if the u-joint is worn, loose you get shaking, when problem is starting you may feel the problem only at a determined speed. If the The U-joint may also bind up when you accelerate. The driveshaft can be checked moving the sections of the shaft by hand and checking if it loose or if there is binding. The center support bearing must also be checked.
In this case the problem would not be related with misfire.

Engine related problems.
If the problem starts at about 60 mph you can exclude failures like a broken engine mount, however, an injector failing or a misfire that takes place only at determined rpm may cause the problem.
Most engine problems leave behind a fault code stored in the PCM even if the CEL does not come on. Better doing a code scan as first thing (in US this is done for free at Autozone). Other tests can only be done in the garage, these include connecting machine to injector and fuel pump to draw the waveform of pulses sent at different speeds.
In this last case the misfire is part of the prime cause of the shaking.

If possible try to understand if problem is given by an auto transmission engaging a too high gear, or by engine missing at that particular speed. Do the tires, just in case.

If you repute my solution helpful, please do not forget to accept. Providing good support requires time and skills, and your rating is important for us.

Best regards.

Ginko.

Posted on Oct 10, 2010

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Before going into more mechanics, try using the spare tire on the front wheels and test drive to see if it helps. Then try the same with the rear wheels. It will take time and effort but as you do it you can check tie rod ends better with the tire off. And it will not cost you anything to try it.

In the rear, with front wheel drive, there are 2 things that can cause this problem. You can check the rear wheel bearings by turning the wheel and checking for noise and excess play. The second thing would be a rear wheel Alignment which many front wheel drive cars require.

If you have rear drum brakes, look for rust outlines of weights missing from the drums. The other mechanics could be the A/C clutch cycling which it does in Defrost and A/C mode. Turn controls to OFF and see if vibration disappears.

Posted on Oct 10, 2010

  • INDIRA KUMAR
    INDIRA KUMAR Oct 10, 2010

    Kindly rate and accept my answer if satisfied or else i wont be given any credit for helping you..

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