Question about 1999 GMC Suburban

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It seems like the transmission jerks while operating at a steady speed.

Does not happen all the time and there is no code in there for this. could this be a 4x4 switch or a cable adjustment slipping?

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Go to the transmission cable where is connected to the throttle body,open the throttle fully by hand,depress the button that you can reach with your finger that's inside the cable connection and cable will reset with a "pop" when it goes to position.The cable will reset itself while you drive and should solve this actioit it is doing.Computer takes care of all else with shift and over-drive and the proper cable setting is done this way from factory.

Posted on May 14, 2014

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Posted on Jan 02, 2017

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Engine jerking


Hi there, let me see if I can help.

There's not much info to go on here, but let me try.....

Ok, if it's "pulling or stopping" in a jerking motion. It sounds like it might be engine related, however, it can be transmission issues also. Lets talk about engine.

Are there any check engine lights? That may be a clue that it's engine related...such as an engine miss.
Try putting the car in park and rev the engine from idle. (note: don't go into the red zone on RPM.) Does if feel rough and jerky? this eliminates the transmission. If so look at cyl miss issues, timing belt "out of time," EGR stuck open....etc...


If the engine passess this test, test drive the vehicle for transmission problems. Find an open road that does not have much traffic. Test at 20, 30, 40, 50, and 60 mph. go to a cruise at speed indicated and then accelerate at light throttle and then heavy throttle then coast.

Do you feel it only when applying power? Nothing on deceleration?

if it does it on most of these speeds (particulary at higher speeds) look at inner C/V joint. You will need to take apart the joint and look at the race for ridges. The vibration can happen when the rollers fall into the worn spots and causes a "jerking" feeling when applying power. (look for leaking grease from inner joints. Damage usually happens when all the grease leaks out.

If it only happens at and around 40mph, it could be a torque converter clutch. Try a transmission flush.
(drain, refill, and run through all the gears P,R,N,D,2,1 BE CAREFUL HERE!!! Keep your foot on the brake. USE YOUR HEAD!!!!!!!!! Don't run vehicle on jack stands. Repeat 3 times. ONLY USE HONDA TRANS FLUID. Yes, it does make a difference! Will take about 12 qts to do a proper flush. See if the problem goes away.

It might need a transmission it it continues after the flush, or you have some other problem that isn't obvious to me with the given info. Hope this helps and happy hunting.

Chris

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