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Transmission is knocking from 5 mph to 15 mph them noise go away

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CHECK THE FLY WHEEL BOLTS

Posted on Mar 12, 2011

Testimonial: "thanks for your help but i was wrong, about the transmission all i did was add power stering fluid to the PS pump and knock, knock, noise go away"

  • orlandoal507 Mar 18, 2011

    thanks for your help

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2 Answers

Whining noise when going 15 mph or less


when your brake pads get worn out they will make a slight grinding noise and when you depress your brakes they will go away .p[retty soon they will grind when you press on brakes.

Jan 30, 2014 | GMC Jimmy Cars & Trucks

1 Answer

Real loud knocking noise when i turn or put it in reverse and hard to get it to go past 30 mph


Go with a completely damaged & blocked exhaust converter

Air In --Air Out Yours doesn't go out & the trans gets confused
& can't use the shift strategy it was born with

That is the 30 mph or a gas filter really clogged,not real likely

What is with the noises?

Turning & just sitting still?

What was the trans shop diagnoses,was it test driven
& did you go alone,have to do that

Your car --so your part of the solution,be proactive

Dec 01, 2012 | Cars & Trucks

1 Answer

Knocks while accelerating


sounds like a thrust bearing

Aug 14, 2012 | 1989 GMC C2500

1 Answer

Engine is knocking needing to know anything and everything that could cause this. We just replaced the transmission a week ago and we have an O2 sensor out.


Engines can make many different noises and people will describe them as knocks, pings, rattles or thumps. A true "knock" is caused by rod or main bearings hitting against the crankshaft. The general cause of that is either too much space between the bearing and crankshaft or insufficient oil pressure to maintain the distance between the bearing and crankshaft. Sometimes you can use a heavier grade oil so that the oil doesn't leak out of the bearing space so quickly. If you're currently using 5 W 15, go to a 10 W 30 or maybe even a 15 W 50. If you can't make the noise go away with that, either the bearings are too worn or it's a different problem. If the engine has less than a couple hundred thousand miles, the only reason for bearings to go bad would be inadequate maintenance.

Other problems that can result in noises like that are:

Piston slap. That's when the skirt (lower part) of the piston is slightly worn and is enough smaller than the cylinder that the skirt "pops" from one side to the other as the engine runs. It's more of an annoyance than a real problem, especially since piston slap typically goes away as the engine warms up a little. It typically takes just a few seconds to go away. If it's piston slap don't worry about it until the engine is rebuilt. Piston slap is quite common among many of the GM 350's, especially in engines that go short distances a lot or don't get adequate maintenance.

Fuel "pinging". That's when the fuel ignites too quickly and causes a sound like something rattling around inside the engine when you step on the accellerator. Use a fuel octane booster or change the engine timing.

Hydraulic lifter noises sounds more like a tapping sound and is usually caused by inconsistent oil changes

SHORT STORY, IT IS 13 YEARS OLD AND 3 YEARS PAST ITS DESIGNED LIFE

Jun 10, 2011 | 1998 Saturn SL

1 Answer

Noise when i go faster the 70mph


it is probably your transmission

Jun 17, 2009 | 2002 Buick Rendezvous

1 Answer

There is a loud noise at 45mph.


Find a quiet empty stretch of road. Go 50 mph, put the trans in NEUTRAL and shut the engine. If noise is still there, swing car left and right to detect noise differences. Could be hub or axle bearings. Not engine or trans if noise is still there. Hope this helps

May 05, 2009 | 2004 Chevrolet TrailBlazer

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