Question about 1999 GMC Jimmy

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99 jimmy 4x4 auto trans is making a knocking sound similar to that of a lifter noise only when warmed up and when in neutral, or between gear shifts or when I let off the gas.

There is no noise when vehicle is started up when cold, noise only comes after vehicle is warm and in neutral or if driving, between shifts and when accelerator is let off. This noise is not heard when vehicle is in forward or reverse and gas is applied but if you are applying gas and shifting from drive to reverse, the noise will appear only when going through neutral but not when torque is applied.

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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transit360

  • 74 Answers

SOURCE: 1996 Grand Cherokee transfer case binding.

Is it a consistent pulsing or does it get faster as the speed goes up?

Posted on Feb 10, 2009

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Anonymous

  • 625 Answers

SOURCE: 2007 gmc envoy

you might have an electric problem since the brake switch comunicates with the transmission module

Posted on May 28, 2008

Anonymous

  • 14 Answers

SOURCE: 2000 GMC Jimmy slow acceleration until 3000 rpms

you could check the fuel pump i recently had some problems with my punp after i replaced it where i would get to 3k rpms and it would sorta shut down and wouldnt go past it untill i let off the pedal

Posted on Nov 18, 2008

Anonymous

  • 109 Answers

SOURCE: whirring/whining noise from rear trans-axle

check your rear end and make sure it has plenty of gear oil..if full then there is friction in it somewhere and it is probly getting ready to go out.

Posted on Dec 02, 2008

Anonymous

  • 37 Answers

SOURCE: My reverse went out but only go forward!

Arthur,

Shouldnt be a big deal.

Your shift linkage is probably bent.

You will need to go to a trans shop and get it fixed.

I highly recommend AAMCO since they warranty their work. They will have to "unbend" the bracket or readjust the cable play, or repair the linkage that places the car in the proper gear according to your indicator on steering column or dash.

Not a big deal...but then again you could have crushed the synchro gears, but i truly doubt it!

Thanks,
Mark

Posted on Dec 30, 2008

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How do you adjust the shift cable on a 1995 gmc jimmy, wont go into reverse or park.


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I have a 99 mustang gt & I know it needs either a pilot bearing or throwout bearing, but it started making a knocking noise when the car reaches @ 2200 rpm & stops after I shift gears! Does not...


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How to use the 4x4


well, if you are sitting still it is recommended you put vehicle in neutral and select 4x4 indicator to desired posistion..... 4 high...4 low...or 2high (auto) when you select 4 low the top speed is not to exceed 25 mph. It is a very low gear for crawling or pulling. At any time you need 4 low gear you must stop trk, shift to neutral and select 4 low. The same procedure is done to change from 4 low to 4 hi or 2 hi. if not done this way internal trans, transfer case or driveline failure will occure. At any time you may shift 4x4 selector from (auto) or 2 hi to 4 hi, and 4 hi to 2 hi or( auto).****** But note, do not make shifts while tires are spinning or under power (acceleration)******* While driving you can make shifts at any speed between 2 hi (auto) and 4 hi and back to 2 hi. release throttle a little and select. you do not have to take foot off throttle all the way! just enough that truck is not under a power, load acceleration. If tires are spinning or you are on the gas and you select gears from 2 & 4 high the posibilities of severe damage can result. Also note that 4x4 is not recommended on dry pavement. When 4x4 is being used also take care as to the handling and the steering characteristics change, On tight turns the front wheels will bind and possibly **** a little. If you have never had a 4x4 before, obey what i have told you untill you get the experiance and you will be fine. HAPPY TRAILS.... AND A LITTLE 4X4 FUN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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1 Answer

2001 jimmy makes a knocking noise when cold. as it warms up the noise gets quieter then stops. It sounds like the rocker arms are tapping?


Most likely it is the rockers tapping the lifters. the crankcase has only leftover oil in it at the start, and has to wait for the oil pump to get it there.
I would add a stablizer to your oil...like LUCAS. It may help a bit with a cold engine.
If the knocking is in the piston, then you should see some indication on the spark plugs...like oil or blow-by build up.

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Next, with truck running, put transmission into any gear, then return to park position. Do you hear any ratcheting noise.

Let me know.
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