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

Im having problems with my 99 mustang first off it makes a real loud knocking noise when i turn in both directions and also when i have it in reverse , second problem is when I'm driving i have to take my foot off of the gas and back on it in order to get it to go faster ( when i have it floored it stays at 30 mph ) then when i let go of the gas petal and floor it again the transmission makes its changes just fine , + took it to a transmission shop to get checked out ,

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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

Posted on Dec 01, 2012

  • 7 more comments 
  • vannessamvp4
    vannessamvp4 Dec 01, 2012

    brand new converter was put in a few months ago , and yes they did test drive it, and was told it was defiantly was not the transmission , new gas filter , if im sitting still in park no knocking but once i pop it in reverse with my foot on the brake i get a loud knocking noise , i also get it while turning on sharp corners

  • vannessamvp4
    vannessamvp4 Dec 01, 2012

    new converter new shocks new brakes new wires and spark plugs new converter , iv been trying my best to find the problem and now its burned a whole in my pocket :/

  • Anonymous Dec 01, 2012

    Let me think awhile & your the best at answering all the questions. You got 90% covered here. Would like to get near that issue but can't from the internet

  • vannessamvp4
    vannessamvp4 Dec 01, 2012

    the check engine light was on but after changing the wires the light went out , the codes i got prier to changing were p0304 p0306 p0175 p0305

  • Anonymous Dec 01, 2012

    Is the steering rack loose on its mounting bushings? How about drive shaft joints,it is rear drive I guess? Something has been missed,we both know that,but what

  • vannessamvp4
    vannessamvp4 Dec 01, 2012

    could it be the maf sensor ?

  • Anonymous Dec 01, 2012

    Was the TPS Sensor back probed & tested,I don't care about obd codes unless you have some. Fuel Pressure at motor?

  • vannessamvp4
    vannessamvp4 Dec 01, 2012

    im not sure i dont think so i will have that checked out

  • Anonymous Dec 01, 2012

    So you had 3 cylinder misfire codes,who knows if they were correct,& an O2 code,I assume that is all better & gone. MAF is hard to check but is common to both banks of the motor

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Posted on Jan 02, 2017

KCGTODAD
  • 169 Answers

SOURCE: Transmission issue? Or worse?

Hello! Although the symptoms you've described could be a result of quite a few things, I have a few questions that might help determine your problem.

1) What year/make/model did the new transmission come from?
2) Is the SES (Service Engine Soon) light on? Is it blinking?
3) Was this transmission a rebuilt or used unit?
Some possibilites:
- you could have a faulty TPS - or Throttle Position Sensor.
- you could have a problem with the input shaft piston being worn. (Hence the used vs. refurb trans question). Once the inner sealing area wears it can prevent the inner lip seal for the piston from sealing properly. You may find that revving the engine up will finally get the car to move and it will BANG into gear. This is because the pump in the transmission is working harder and moving more fluid thus allowing the added fluid to overcome the leak which prevented the clutch from either initially applying or staying applied. Another area of concern that causes this is a boost valve in the valve body, not near as common but it can cause this problem on a lessor scale.

- Trouble Code P0742 TCC Stuck ON:
When this trouble code is set the pcm will command max TCC and lock adaptive shifting. This code can be broken down into three potential problem areas as found to be common in the field.

1. This problem can be a mechanical problem. Possible causes of this could be a bad or stuck TCC switch that signals the pcm of current TCC operation. Another cause though not common is a stuck TCC switch or apply valve. If it is physically stuck in the wrong position it can cause the TCC to be stuck on all the time and even kill the engine when the vehicle is put into gear.

2. This problem can be found to be an electrical problem. If the wire from the TCC pressure switch to the pcm is grounded anywhere in the path it can throw this code. This could be a wire shorted inside the trans on the internal wiring harness or the actual engine wiring harness. If the wire is grounded the pcm thinks that TCC is on when it shouldnt be and will throw the code.

3. This problem can be a hydraulic problem. This is the most common cause of this code that I have found and stems back to a clogged TCC solenoid, not because it failed. Excessive debris in the transmission or a failing torque converter lockup clutch can cause the solenoid to have debris stuck inside and this causes a restriction in fluid flow through the solenoid. If the solenoid can not bleed off the pressure the TCC can be stuck on. If the wrong TCC solenoid is installed during an overhaul this problem can also arise as a late 4L60E solenoid is identical but does not operate the same and acts like a clogged solenoid. As mentioned in problem #1 a stuck TCC apply valve is a physical problem but causes a hydraulic problem because the fluid pressure will not properly bleed off because the valve is stuck in the wrong position instead of being able to move freely in the bore of the valve body.
Above are the common causes of this code, there are other possibilities but those are what generally causes the fault. A thorough diagnosis is the only way to determine what is really at fault and a new TCC solenoid should never be assumed as the actual problem until verified.


HTH - and thanks for using FixYa!

-KCGTODAD

Posted on Feb 02, 2010

Testimonial: "Excellent feedback, thanks!"

  • 180 Answers

SOURCE: hard to start then will die if you dont apply gas

check the map sensor, tps, and air temp sensors. Also test fuel pressure.

Posted on Feb 21, 2011

Testimonial: "Thanks for th advice will give these a try "

  • 5256 Answers

SOURCE: my 1995 suburban won't go faster than 25-30 mph even with foot to floor,service engine light on

Foot to the floor, go directly to a parts store, and get a free scan of the computer for the trouble codes and their description. Post them here, or have a mechanic start diagnosing what the codes tell him to check.
Good luck.

Posted on May 30, 2012

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