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Not Sweet Vibrations

1004 Views 9 Replies 5 Participants Last post by  Pikey
This one has me scratching my head, but then again I do that a lot when it comes to truck repairs. I have a 98 Suburban K1500 5.7 4x4 and over the last few days something has started to happen.
When I hit speeds of 60 and again at 65 the truck vibrates in the front end, and only at those speeds. It also made the service engine light come on yesterday but not today, still had the vibrations at those speeds.
Well never had this happen before, I can build a great home and build a great set of golf clubs but when it comes to trucks I'm lost. Now I can tell you what's wrong and follow directions, so my eyes are open and I'm ready.
I thank you guy's that know these type of things and it's so great to have sites like this for us shade tree mechanic's. Hope to read ton's of input and I really pray that the problem is not major.
God Bless
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Is the light flashing? We need to try to narrow down if it is the engine, suspension, or drive train. If you put your foot on the brake and give it had will it vibrate? Jack up the front end and spin the tires by hand. Feel any crunchiness? Grab the tire at 9 and 3 o'clock, give it a wiggle any movement? Do the same at 12 and 6 o'clock. It could be a bad wheel hub, thrown wheel weight, bad cv shaft ( if 4x4), bad ujoints. That is why we need to try to narrow it down. Have that code read at a parts store and tell us what it is. That could help also
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It is called a brake torque. You hold your foot on the brake pedal so the truck will not move and press the gas pedal. I am just wondering if your service engine soon light was some sort of misfire detected
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Check fuel pressure with a gauge.
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